昨天我們能讓 contract 接收 ether 了，那如果想在 contract 裡把 ether 送給別人應該要怎麼做呢？
就讓我們來討論一下 Address type 與他的一些操作吧！

本日合約:

pragma solidity ^0.4.25;

contract Address {
    function() public payable {}
    function Balance() public view returns (uint256) {
        return address(this).balance;
    }
    function Transfer(uint256 amount) public returns (bool) {
        msg.sender.transfer(amount * 1 ether);
        return true;
    }
    function SendWithoutCheck(uint256 amount) public returns (bool) {
        msg.sender.send(amount * 1 ether);
        return true;
    }
    function SendWithCheck(uint256 amount) public returns (bool) {
        require(msg.sender.send(amount * 1 ether), "Send failed");
        return true;
    }
}

本日影片:
https://youtu.be/s82EGggALMg

Smart Contract 實戰教學播放清單：
https://www.youtube.com/playlist?list=PLHmOMPRfmOxSJcrlwyandWYiuP9ZAMYoF