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Test4.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
contract loopAndFunctionChallenge{
    // function that takes two number and add them together
    function addTwoNumber(uint a, uint b) external pure returns (uint) {
        return a + b;
    }
    // function that substract two given number
    function substractTwoNumber(uint a, uint b) external pure returns (uint){
        //checking to make sure it does not return negative number
        if (a >= b) {
            return a - b;
        }
        return b - a;
    }
    //function that multiply two given number
    function multiplyTwoNumber(uint a, uint b)external pure returns (uint) {
        return a * b;
    }
    //function that divide two given number
    function divideTwoNumber(uint a, uint b)external pure returns (uint) {
        if(b != 0){        
        return a / b;
        }
        return 0;
    }
}