Hi,
I am trying to execute the following contract on the Remix IDE. When I deploy the contract, Remix IDE shows me the tabs of all the functions. When I click the setFirstName(..) function, it asks the input for the variable _val, when I give the value and press the trasact button, I get the following error:
[vm] from: 0x5B3...eddC4to: MyContract.setFirstName(string) 0x7EF...8CB47value: 0 weidata: 0x639...00000logs: 0hash: 0xf02...883db
transact to MyContract.setFirstName errored: VM error: invalid opcode. invalid opcode The execution might have thrown. Debug the transaction to get more information.
Following is the code of my contract:
pragma solidity 0.5.9;
contract MyContract{
uint256 peopleCount;
struct Person{
string _firstName;
string _lastName;
}
Person[] public people;
function addPerson(string memory _firstName, string memory _lastName) public{
people.push(Person(_firstName, _lastName));
peopleCount += 1;
}
function getFirstName() public view returns (string memory) {
return people[0]._firstName;
}
function getLastName() public view returns (string memory){
return people[0]._lastName;
}
function setFirstName(string memory _val) public {
people[0]._firstName = _val;
}
}
The image of remix IDE is:
I don’t know how to do the debugging. Somebody please guide me.
Zulfi.