pragma solidity ^0.4.21; contract GuessTheRandomNumberChallenge { uint8 answer; function GuessTheRandomNumberChallenge() public payable { require(msg.value == 1 ether); answer = uint8(keccak256(block.blockhash(block.number - 1), now)); } 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); } } }
0.4.21