以太坊 猜单双游戏

猜单双，赔率1:1

pragma solidity 0.5.16;library GuessOracle{function oracle() external returns(uint){return uint(1);}
}

pragma solidity 0.5.16;import "./GuessOracle.sol";contract GuessParity{address private fundPoolAddress;    //平台资金地址uint private periods;               //期数struct Guess{address player;     //玩家地址uint amount;        //投注金额uint number;        //玩家预言的数字， 0：单， 1：双bool isSucc;        //是否预言成功}constructor(address _fundPoolAddress) public{fundPoolAddress = _fundPoolAddress;}mapping (uint => Guess) public guessList;//玩家预言历史记录mapping (uint => uint) public oracleList;//往期记录//玩家投递预言function prophecy(uint _num) public payable{uint _periods = periods;uint newOracle = GuessOracle.oracle();oracleList[_periods] = newOracle;if(_num == newOracle){//预言命中require(address(this).balance > (msg.value * 2), "余额不足");guessList[_periods] = Guess({player:msg.sender, amount:msg.value, number:_num, isSucc:true});//给用户转账，金额为用户发送额*2msg.sender.transfer(msg.value * 2);}else{//没有命中,guessList[_periods] = Guess({player:msg.sender, amount:msg.value, number:_num, isSucc:false});}periods++;}function getFundPoolAddress() public view returns(address){return fundPoolAddress;}function getBalance() public view returns(uint){return address(this).balance;}}