amarachiugwu

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

library MathLibrary {
    function add(uint a, uint b) external pure returns(uint){
        return a + b;
    }
}

contract A {

amarachiugwu

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;


// GGGF -> Great Grand Grand Father
// GGF -> Great Grand Father
// GF -> Grand Father
// F -> Father

contract GGGF {

amarachiugwu

//SPDX-License-Identifier:MIT
pragma solidity 0.8.5;

contract ATMMachine {
    // this is the reserve of the atm machine
    address public owner;

    constructor () {
        owner = msg.sender;
    }

amarachiugwu

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract ComprehensiveContract {
    // State variables with different visibility specifiers
    uint256 public publicData;       // Public visibility: accessible from outside
    uint256 internal internalData;   // Internal visibility: accessible within this contract and derived contracts
    uint256 private privateData;     // Private visibility: accessible only within this contract

    // Enum definition

amarachiugwu

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 < 0.9.0;

contract Wallet {
    // recieve ether
    // send ether
    // store ether
    // withdrawl ether
    // check balance