01.Guess the number

Guess the number

topic

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);
        }
    }
}

analyses

It is easy to complete this level. We can see the answer “42”. So we dont need to guess.

solution

call guess(uint8) with the parameter “42” and 1 ETH.