Guess the number

1. 题目

I’m thinking of a number. All you have to do is guess it.
题目代码：

// SPDX-License-Identifier: MIT
pragma solidity ^0.4.21;

contract GuessTheNumberChallenge {
    uint8 answer = 42;

    function GuessTheNumberChallenge() public payable {
        require(msg.value == 1 ether);
    }

    function isComplete() public view returns (bool) {
        return address(this).balance == 0;
    }

    function guess(uint8 n) public payable {
        require(msg.value == 1 ether);

        if (n == answer) {
            msg.sender.transfer(2 ether);
        }
    }
}

2. 分析

2.1 这题是猜数字，但是他的数字是写死的，通过 ethers读取。
2.2 但是部署和猜数字都需要支付 1ether ，即两个，如果猜对了他就会返回之前支付的ether

3. 解题

3.1 部署，msg.value = 1 ether
![image-20240412144722655](Guess the number/image-20240412144722655.png)
3.2 调用 guss() 函数
![image-20240412144732902](Guess the number/image-20240412144732902.png)
3.3 查看合约余额
![image-20240412144740840](Guess the number/image-20240412144740840.png)