003-functions-in-solidity.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

/**
 * Learn about functions in solidity
 * Manipulating and calling functions to execute
 */

// A function is a group of code that can be called anywhere within your program
// Eliminating the possibility of writing thesame block of code many times

contract LearnFunctions {
    // syntax
    // function functionName(parameter list) scope returns(return type) { statements }

    // examples
    function remoteControlOpen(bool closedDoor) public returns (bool) {}

    // state variables
    // uint defaultValue = 5;

    function addValues() public pure returns (uint256) {
        // local variables - scope: only valid or accessible within the this function
        uint256 a = 2;
        uint256 b = 3;
        uint256 result = a + b;

        return result;
    }

    // function with parameters
    function multiplyValues(uint256 a, uint256 b)
        public
        pure
        returns (uint256)
    {
        uint256 result = a * b;
        return result;
    }
}