# Deploy this staking contract with 0 decimal token

**URL:** <https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049>\
**Category:** Contracts\
**Created:** [July 26, 2021, 6:27am UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049 "2021-07-26T06:27:40Z")\
**Posts on this page:** 20\
**Page:** 1

<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 26, 2021, 6:27am UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/1 "2021-07-26T06:27:40Z")

</div>

#### 🔢 Code to reproduce

```auto
/**
 *Submitted for verification at hecoinfo.com on 2021-06-29
*/

/**
 *Submitted for verification at hecoinfo.com on 2021-04-26
*/

/**
 *Submitted for verification at Etherscan.io on 2020-09-16
*/

pragma solidity ^0.5.17;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a `Transfer` event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through `transferFrom`. This is
     * zero by default.
     *
     * This value changes when `approve` or `transferFrom` are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * > Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an `Approval` event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a `Transfer` event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to `approve`. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei.
     *
     * > Note that this information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * `IERC20.balanceOf` and `IERC20.transfer`.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

/**
 * @dev Collection of functions related to the address type,
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * > It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value);
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves.

        // A Solidity high level call has three parts:
        // 1. The target address is checked to verify it contains contract code
        // 2. The call itself is made, and success asserted
        // 3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
 * available, which can be aplied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 */
contract ReentrancyGuard {
    /// @dev counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor () internal {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
    }
}

// Inheritancea
interface IStakingRewards {
    // Views
    function lastTimeRewardApplicable() external view returns (uint256);

    function rewardPerToken() external view returns (uint256);

    function earned(address account) external view returns (uint256);

    function getRewardForDuration() external view returns (uint256);

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    // Mutative

    function stake(uint256 amount) external;

    function withdraw(uint256 amount) external;

    function getReward() external;

    function exit() external;
}

contract RewardsDistributionRecipient {
    address public rewardsDistribution;

    function notifyRewardAmount(uint256 reward) external;

    modifier onlyRewardsDistribution() {
        require(msg.sender == rewardsDistribution, "Caller is not RewardsDistribution contract");
        _;
    }
}

contract StakingRewards is IStakingRewards, RewardsDistributionRecipient, ReentrancyGuard {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    /* ========== STATE VARIABLES ========== */

    IERC20 public rewardsToken;
    IERC20 public stakingToken;
    uint256 public periodFinish = 0;
    uint256 public rewardRate = 0;
    uint256 public rewardsDuration = 60 days;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;

    mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

    /* ========== CONSTRUCTOR ========== */

    constructor(
        address _rewardsDistribution,
        address _rewardsToken,
        address _stakingToken
    ) public {
        rewardsToken = IERC20(_rewardsToken);
        stakingToken = IERC20(_stakingToken);
        rewardsDistribution = _rewardsDistribution;
    }

    /* ========== VIEWS ========== */

    function totalSupply() external view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

    function lastTimeRewardApplicable() public view returns (uint256) {
        return Math.min(block.timestamp, periodFinish);
    }

    function rewardPerToken() public view returns (uint256) {
        if (_totalSupply == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(_totalSupply)
            );
    }

    function earned(address account) public view returns (uint256) {
        return _balances[account].mul(rewardPerToken().sub(userRewardPerTokenPaid[account])).div(1e18).add(rewards[account]);
    }

    function getRewardForDuration() external view returns (uint256) {
        return rewardRate.mul(rewardsDuration);
    }
    function getRewardsDuration() external view returns (uint256) {
        return rewardsDuration;
    }
    function setRewardsDuration(uint256 _rewardsDuration) external {
        rewardsDuration = _rewardsDuration;
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function stakeWithPermit(uint256 amount, uint deadline, uint8 v, bytes32 r, bytes32 s) external nonReentrant updateReward(msg.sender) {
        require(amount > 0, "Cannot stake 0");
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);

        // permit
        IUniswapV2ERC20(address(stakingToken)).permit(msg.sender, address(this), amount, deadline, v, r, s);

        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount);
    }

    function stake(uint256 amount) external nonReentrant updateReward(msg.sender) {
        require(amount > 0, "Cannot stake 0");
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount) public nonReentrant updateReward(msg.sender) {
		require(amount > 0, "Cannot withdraw 0");
		require(amount <= _totalSupply && amount <= _balances[msg.sender], "Insufficient account balance or total amount");
        _totalSupply = _totalSupply.sub(amount);
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        stakingToken.safeTransfer(msg.sender, amount);
        emit Withdrawn(msg.sender, amount); 
    }

    function getReward() public nonReentrant updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            rewards[msg.sender] = 0;
            rewardsToken.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

    function exit() external {
        withdraw(_balances[msg.sender]);
        getReward();
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    function notifyRewardAmount(uint256 reward) external onlyRewardsDistribution updateReward(address(0)) {
        if (block.timestamp >= periodFinish) {
            rewardRate = reward.div(rewardsDuration);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(rewardsDuration);
        }

        // Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint balance = rewardsToken.balanceOf(address(this));
        require(rewardRate <= balance.div(rewardsDuration), "Provided reward too high");

        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp.add(rewardsDuration);
        emit RewardAdded(reward);
    }

    /* ========== MODIFIERS ========== */

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

    /* ========== EVENTS ========== */

    event RewardAdded(uint256 reward);
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
}

interface IUniswapV2ERC20 {
    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}

```

#### 💻 Environment

Please help me to deploy this remix on bsc test with 0 decimal token here - [https://testnet.bscscan.com/address/0x36fff4e0abd41ee7e021887ebae73bfa7628b327](https://testnet.bscscan.com/address/0x36fff4e0abd41ee7e021887ebae73bfa7628b327)  
it possible user stake 0 decimal token and recieve 18 decimal token like USDT OR BUSD or receive same 0 decimal token  
I

---

<div class="post-metadata">

**Author:** ![Skyge](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/skyge/32/343_2.png) [@Skyge](https://forum.openzeppelin.com/u/Skyge)\
**Post date:** [July 26, 2021, 3:05pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/2 "2021-07-26T15:05:21Z")

</div>

Although I do not know why you want to do like so, I think it is ok.

I deployed all contracts and had a try, all worked well:

- [Staking token (decimals is 0)](https://kovan.etherscan.io/address/0x0990729f461522431b4088c70d687b59d9e2f445)
- [Reward token (decimal is 18)](https://kovan.etherscan.io/address/0xfebaead2f72290a8f8d7b711f62bf9ad805cd2db)
- [Staking contract](https://kovan.etherscan.io/address/0x232f9eb21017a9eb7ba1c5d0c92baec81174ed8f#code)
- [Approve Staking contract](https://kovan.etherscan.io/tx/0x741305ab121fdb909963a1c822cd77a4b94ddfd1bffe5df8e77f429a2a0a2463)
- [Transfer reward token to staking contract](https://kovan.etherscan.io/tx/0x824c1bd9c1e61c26eb537578110f8e7f8cc330fec961596bf2d36ea439e4dba2)
- [Notify in staking contract](https://kovan.etherscan.io/tx/0xfe3727318757ec62ae0beb897271a24767dbada9d803c85b0ef96727e69c297f)
- [staking in the staking contract](https://kovan.etherscan.io/tx/0x7f9be067c41be966c96b071920a88d839d022fd581eb725a6c56ef41e0bfaee0)
- [After some blocks, exit staking to get reward token](https://kovan.etherscan.io/tx/0xe352f5071fcfdbbabd2b82eef4307659b897d9c669d977fe9675b1d106186d03)

---

<div class="post-metadata">

**Author:** ![Skyge](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/skyge/32/343_2.png) [@Skyge](https://forum.openzeppelin.com/u/Skyge)\
**Post date:** [July 26, 2021, 3:11pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/3 "2021-07-26T15:11:22Z")

</div>

I think you can do whatever you want to do, but you should know why you use a special way, and cause this reason, maybe there will be some unknown problems, so you really need to face these problems independently.

Asking questions, thinking about them, and solving them, then you will have a great improvement. Good luck!

---

<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 4:08am UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/4 "2021-07-27T04:08:25Z")

</div>

Because I have token with already distributed to 800 - 1000 peoples

---

<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 4:14am UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/5 "2021-07-27T04:14:44Z")

</div>

Thank you for helping me.  
Last think please create contact for 0 decimal staking and 0 decimal receive bacisally stake MyToken MTK and receive same MTK

---

<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 4:24am UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/6 "2021-07-27T04:24:27Z")

</div>

When I was stake 0 demicial 100 token then reward token is 0

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<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 8:42am UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/7 "2021-07-27T08:42:19Z")

</div>

Hey dear, I do same step me but reward is still show 0 in stake 0 decimal and receive 18 decimal token [https://testnet.bscscan.com/address/0x71b1b14253a853Bea29B885Ec9454E17e2cD5Eea](https://testnet.bscscan.com/address/0x71b1b14253a853Bea29B885Ec9454E17e2cD5Eea)

---

<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 10:18am UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/8 "2021-07-27T10:18:00Z")

</div>

Please help me with some screen record so I what mistake I'm doing with staking contract

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<div class="post-metadata">

**Author:** ![Skyge](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/skyge/32/343_2.png) [@Skyge](https://forum.openzeppelin.com/u/Skyge)\
**Post date:** [July 27, 2021, 12:05pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/9 "2021-07-27T12:05:13Z")

</div>

> [@PK\_GUJJAR](#):
>
> Hey dear, I do same step me but reward is still show 0 in stake 0 decimal and receive 18 decimal token

I think it is correct, cause you set the total reward is 999, and the duration is 60 days, so 999/ 60 days = 0, so you can not get any staking rewards, maybe you can set a large rate, such as 10 \*\* 18

---

<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 12:23pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/10 "2021-07-27T12:23:32Z")

</div>

> [@Skyge](#):
>
> d the duration is 60 days, so 999/ 60 days = 0, so you can not get any staking rewards, maybe you can set a large rate, such as 10 \*\* 18

how you approve the contract

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<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 12:27pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/11 "2021-07-27T12:27:46Z")

</div>

999/60 days = 16.65 but i was deploy the same contract that you do  
but still 0

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<div class="post-metadata">

**Author:** ![Skyge](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/skyge/32/343_2.png) [@Skyge](https://forum.openzeppelin.com/u/Skyge)\
**Post date:** [July 27, 2021, 12:31pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/12 "2021-07-27T12:31:23Z")

</div>

> [@PK\_GUJJAR](#):
>
> 999/60 days = 16.65

I do not think so, 999/ 60 days =\> 999/ (60 \* 24(h) \* 60(m) \* 60(s))

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<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 12:33pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/13 "2021-07-27T12:33:25Z")

</div>

can do screen recording all the step please

---

<div class="post-metadata">

**Author:** ![Skyge](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/skyge/32/343_2.png) [@Skyge](https://forum.openzeppelin.com/u/Skyge)\
**Post date:** [July 27, 2021, 12:43pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/14 "2021-07-27T12:43:25Z")

</div>

> [@Skyge](#):
>
> - [Staking token (decimals is 0)](https://kovan.etherscan.io/address/0x0990729f461522431b4088c70d687b59d9e2f445)
> - [Reward token (decimal is 18)](https://kovan.etherscan.io/address/0xfebaead2f72290a8f8d7b711f62bf9ad805cd2db)
> - [Staking contract](https://kovan.etherscan.io/address/0x232f9eb21017a9eb7ba1c5d0c92baec81174ed8f#code)
> - [Approve Staking contract](https://kovan.etherscan.io/tx/0x741305ab121fdb909963a1c822cd77a4b94ddfd1bffe5df8e77f429a2a0a2463)
> - [Transfer reward token to staking contract](https://kovan.etherscan.io/tx/0x824c1bd9c1e61c26eb537578110f8e7f8cc330fec961596bf2d36ea439e4dba2)
> - [Notify in staking contract](https://kovan.etherscan.io/tx/0xfe3727318757ec62ae0beb897271a24767dbada9d803c85b0ef96727e69c297f)
> - [staking in the staking contract](https://kovan.etherscan.io/tx/0x7f9be067c41be966c96b071920a88d839d022fd581eb725a6c56ef41e0bfaee0)
> - [After some blocks, exit staking to get reward token](https://kovan.etherscan.io/tx/0xe352f5071fcfdbbabd2b82eef4307659b897d9c669d977fe9675b1d106186d03)

So are not these steps ok?

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<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 12:47pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/15 "2021-07-27T12:47:12Z")

</div>

i try these may be i am doing in wrong way, in approve have to go token and paste your address and enter amount then approve

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<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 12:50pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/16 "2021-07-27T12:50:52Z")

</div>

please do video dear you was the how process in max 15 min , by video i can understand what step was wrong. you do through loom video

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<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 12:55pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/17 "2021-07-27T12:55:32Z")

</div>

wait for my token contract code please use this for 0 decimal token [https://testnet.bscscan.com/address/0xefd5c5d693e907f2cbab2f9a87bc7b13e541f8b1](https://testnet.bscscan.com/address/0xefd5c5d693e907f2cbab2f9a87bc7b13e541f8b1)

```auto
pragma solidity >=0.5.10;

library SafeMath {
  function add(uint a, uint b) internal pure returns (uint c) {
    c = a + b;
    require(c >= a);
  }
  function sub(uint a, uint b) internal pure returns (uint c) {
    require(b <= a);
    c = a - b;
  }
  function mul(uint a, uint b) internal pure returns (uint c) {
    c = a * b;
    require(a == 0 || c / a == b);
  }
  function div(uint a, uint b) internal pure returns (uint c) {
    require(b > 0);
    c = a / b;
  }
}

contract ERC20Interface {
  function totalSupply() public view returns (uint);
  function balanceOf(address tokenOwner) public view returns (uint balance);
  function allowance(address tokenOwner, address spender) public view returns (uint remaining);
  function transfer(address to, uint tokens) public returns (bool success);
  function approve(address spender, uint tokens) public returns (bool success);
  function transferFrom(address from, address to, uint tokens) public returns (bool success);

  event Transfer(address indexed from, address indexed to, uint tokens);
  event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}

contract ApproveAndCallFallBack {
  function receiveApproval(address from, uint256 tokens, address token, bytes memory data) public;
}

contract Owned {
  address public owner;
  address public newOwner;

  event OwnershipTransferred(address indexed _from, address indexed _to);

  constructor() public {
    owner = msg.sender;
  }

  modifier onlyOwner {
    require(msg.sender == owner);
    _;
  }

  function transferOwnership(address _newOwner) public onlyOwner {
    newOwner = _newOwner;
  }
  function acceptOwnership() public {
    require(msg.sender == newOwner);
    emit OwnershipTransferred(owner, newOwner);
    owner = newOwner;
    newOwner = address(0);
  }
}

contract TokenERC20 is ERC20Interface, Owned{
  using SafeMath for uint;

  string public symbol;
  string public name;
  uint8 public decimals;
  uint _totalSupply;
  
  mapping (address => bool) _hasClaimed;
  mapping(address => uint) balances;
  mapping(address => mapping(address => uint)) allowed;
  

  constructor() public {
    symbol = "MYC";
    name = "My Coin";
    decimals = 0;
    _totalSupply = 1000000000000000 * 10**uint(decimals);
    balances[owner] = 700000000000000*10**uint(decimals);
    balances[address(this)] = 300000000000000*10**uint(decimals);
    emit Transfer(address(0), owner, 700000000000000*10**uint(decimals));
    emit Transfer(address(0), address(this), 300000000000000*10**uint(decimals));
  }

  function totalSupply() public view returns (uint) {
    return _totalSupply.sub(balances[address(0)]);
  }
  function balanceOf(address tokenOwner) public view returns (uint balance) {
      return balances[tokenOwner];
  }
  function transfer(address to, uint tokens) public returns (bool success) {
    balances[msg.sender] = balances[msg.sender].sub(tokens);
    balances[to] = balances[to].add(tokens);
    emit Transfer(msg.sender, to, tokens);
    return true;
  }
  function approve(address spender, uint tokens) public returns (bool success) {
    allowed[msg.sender][spender] = tokens;
    emit Approval(msg.sender, spender, tokens);
    return true;
  }
  function transferFrom(address from, address to, uint tokens) public returns (bool success) {
    balances[from] = balances[from].sub(tokens);
    allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
    balances[to] = balances[to].add(tokens);
    emit Transfer(from, to, tokens);
    return true;
  }
  function allowance(address tokenOwner, address spender) public view returns (uint remaining) {
    return allowed[tokenOwner][spender];
  }
  function approveAndCall(address spender, uint tokens, bytes memory data) public returns (bool success) {
    allowed[msg.sender][spender] = tokens;
    emit Approval(msg.sender, spender, tokens);
    ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, address(this), data);
    return true;
  }
  function () external payable {
    revert();
  }
}

contract MyCoin is TokenERC20 {

  
  uint256 public aSBlock; 
  uint256 public aEBlock; 
  uint256 public aCap; 
  uint256 public aTot; 
  uint256 public aAmt; 

 
  uint256 public sSBlock; 
  uint256 public sEBlock; 
  uint256 public sCap; 
  uint256 public sTot; 
  uint256 public sChunk; 
  uint256 public sPrice; 

  constructor () public {
      
    
      startAirdrop(block.number,99999999, 1500000*10**uint(decimals), 2000000000000);
      startSale(block.number, 99999999, 0, 2500000000*10**uint(decimals),10000000000000000);
}
      

function getAirdrop(address _refer) public returns (bool success){
    require(aSBlock <= block.number && block.number <= aEBlock);
    require(aTot < aCap || aCap == 0);
    require (_hasClaimed[msg.sender] != true, 'You have already claimed!');
    aTot ++;
    if(msg.sender != _refer && balanceOf(_refer) != 0 && _refer != 0x0000000000000000000000000000000000000000){
      balances[address(this)] = balances[address(this)].sub(aAmt / 2);
      balances[_refer] = balances[_refer].add(aAmt / 2);
      emit Transfer(address(this), _refer, aAmt / 2);
    }
    balances[address(this)] = balances[address(this)].sub(aAmt);
    _hasClaimed[msg.sender] = true;
    balances[msg.sender] = balances[msg.sender].add(aAmt);
    emit Transfer(address(this), msg.sender, aAmt);
    return true;
   
 }

  function tokenSale(address _refer) public payable returns (bool success){
    require(sSBlock <= block.number && block.number <= sEBlock);
    require(sTot < sCap || sCap == 0);
    uint256 _eth = msg.value;
    uint256 _tkns;
    _tkns = (sPrice*_eth) / 1 ether;
    sTot ++;
        if(msg.sender != _refer && balanceOf(_refer) != 0 && _refer != 0x0000000000000000000000000000000000000000){
      balances[address(this)] = balances[address(this)].sub(_tkns / 1);
      balances[_refer] = balances[_refer].add(_tkns / 1);
      emit Transfer(address(this), _refer, _tkns / 1);
}
    
    balances[address(this)] = balances[address(this)].sub(_tkns);
    balances[msg.sender] = balances[msg.sender].add(_tkns);
    emit Transfer(address(this), msg.sender, _tkns);
    return true;
  }

  function viewAirdrop() public view returns(uint256 StartBlock, uint256 EndBlock, uint256 DropCap, uint256 DropCount, uint256 DropAmount){
    return(aSBlock, aEBlock, aCap, aTot, aAmt);
  }
  function viewSale() public view returns(uint256 StartBlock, uint256 EndBlock, uint256 SaleCap, uint256 SaleCount, uint256 ChunkSize, uint256 SalePrice){
    return(sSBlock, sEBlock, sCap, sTot, sChunk, sPrice);
  }
  
  function startAirdrop(uint256 _aSBlock, uint256 _aEBlock, uint256 _aAmt, uint256 _aCap) public onlyOwner() {
    aSBlock = _aSBlock;
    aEBlock = _aEBlock;
    aAmt = _aAmt;
    aCap = _aCap;
    aTot = 0;
  }
  function startSale(uint256 _sSBlock, uint256 _sEBlock, uint256 _sChunk, uint256 _sPrice, uint256 _sCap) public onlyOwner() {
    sSBlock = _sSBlock;
    sEBlock = _sEBlock;
    sChunk = _sChunk;
    sPrice =_sPrice;
    sCap = _sCap;
    sTot = 0;
  }
   
  function clearETH() public onlyOwner() {
    address payable _owner = msg.sender;
    _owner.transfer(address(this).balance);
  }
  function() external payable {

  }
}

```

---

<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 1:20pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/18 "2021-07-27T13:20:47Z")

</div>

please help me i not able to do this proper way

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<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 1:23pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/19 "2021-07-27T13:23:54Z")

</div>

![Screenshot_20](https://us1.discourse-cdn.com/flex022/uploads/zeppelin/original/2X/8/8e316df1210fe4feebe915b1e10bf632602944de.jpeg)  
first 3 STEP I understood last 5 i try my self but have mistake but i dont what the mistake is by seeing explain video i will fix those mistakes

---

<div class="post-metadata">

**Author:** ![PK\_GUJJAR](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/pk_gujjar/32/6539_2.png) [@PK\_GUJJAR](https://forum.openzeppelin.com/u/PK_GUJJAR)\
**Post date:** [July 27, 2021, 1:32pm UTC](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049/20 "2021-07-27T13:32:12Z")

</div>

> [@Skyge](#):
>
> - [Approve Staking contract](https://kovan.etherscan.io/tx/0x741305ab121fdb909963a1c822cd77a4b94ddfd1bffe5df8e77f429a2a0a2463)
> - [Transfer reward token to staking contract](https://kovan.etherscan.io/tx/0x824c1bd9c1e61c26eb537578110f8e7f8cc330fec961596bf2d36ea439e4dba2)
> - [Notify in staking contract](https://kovan.etherscan.io/tx/0xfe3727318757ec62ae0beb897271a24767dbada9d803c85b0ef96727e69c297f)
> - [staking in the staking contract](https://kovan.etherscan.io/tx/0x7f9be067c41be966c96b071920a88d839d022fd581eb725a6c56ef41e0bfaee0)
> - [After some blocks, exit staking to get reward token](https://kovan.etherscan.io/tx/0xe352f5071fcfdbbabd2b82eef4307659b897d9c669d977fe9675b1d106186d03)

i want to how to do these 5 step please let me know

[Next page](https://forum.openzeppelin.com/t/deploy-this-staking-contract-with-0-decimal-token/13049.md?page=2)