marcomu

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


interface IERC20{
    function totalSupply() external view returns (uint256);
    function balanceOf(address _owner) external view returns (uint256 balance);
    function transfer(address _to, uint256 _value) external returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value) external returns (bool success);
    function approve(address _spender, uint256 _value) external returns (bool success);

marcomu

pragma solidity ^0.4.24;

contract ERC20{
    
    string public name = "BAM Coin";
    string public symbol = "BAM";
    uint256 public totalSupply;
    
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;