// SPDX-License-Identifier: MIT pragma solidity >=0.4.22 <0.9.0; // addition, subtraction, multiplication and division contract Math { // address public owner; // constructor() { // owner = msg.sender; // } function add(int a, int b) public pure returns(int) { return a + b; } function sub(int a, int b) public pure returns(int) { return a - b; } function mul(int a, int b) public pure returns(int) { return a * b; } function div(int a, int b) public pure returns(int) { return a / b; } } 0.6.10