TestContract

TestContract.sol

// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.12;

contract TestContract {

    uint public myUint = 111222333444555;
    string private myString;
    address public myAddress;

    constructor(string memory _newString) {
        myString = _newString;
        myAddress = msg.sender;
    }

    function setMyUint(uint newUint) external {
        require(newUint > myUint, "newUint must be higher than myUint");
        myUint = newUint;
    }

    function setMyString(string memory newString) external payable {
        require(msg.value > 1000000, "You must pay 1,000,000 to set a new string");
        myString = newString;
    }

    function setMyAddress(address newAddress) external {
        require(msg.sender == myAddress, "Only owner of the contract can set new Address");
        myAddress = newAddress;
    }

    function getMyUint() external view returns(uint) {
        return myUint;
    }

    function getMyString() external view returns(string memory) {
        return myString;
    }

    function getMyAddress() external view returns(address) {
        return myAddress;
    }

}