finleyexp · January 21, 2020 17:43 · Jan 21, 2020
diff --git a/iGuess.sol b/iGuess.sol
@@ -0,0 +1,63 @@
+// DON'T USE. INTENDED FOR EDUCATIONAL PURPOSES ONLY. PLUS, it errors.
+// adapted from: https://tij.me/blog/scamming-people-via-ethereum-smart-contracts/
+
+pragma solidity >=0.4.24 <0.7.0;
+
+contract iGuess {
+
+    uint256 private secretNumber;
+    uint256 public lastPlayed;
+    address public owner;
+
+    struct Player {
+        address addr;
+        uint256 ethr;
+    }
+
+    Player[] players;
+
+    constructor() public {
+        // On construct set the owner and a random secret number
+        owner = msg.sender;
+        shuffle();
+    }
+
+    function guess(uint256 number) public payable {
+        // Guessing costs a minimum of 0.0001 ether 
+        require(msg.value >= 0.0001 ether);
+
+        // Guess must be between zero and ten
+        require(number >= 0 && number <= 10);
+
+        // Update the last played date
+        lastPlayed = now;
+
+        // Add player to the players list (added memory -- should I have used storage?)
+        Player memory player;
+        player.addr = msg.sender;
+        player.ethr = msg.value;
+        players.push(player);
+
+        // Payout if guess is correct
+        if (number == secretNumber) {
+             address(this).balance;
+        }
+
+        // Refresh the secret number
+        shuffle();
+    }
+
+    function shuffle() internal returns (uint) {
+        // Randomly set secretNumber with a value between 1 and 10
+        secretNumber = uint(keccak256(abi.encodePacked(now, msg.sender))) % 10 + 1;
+        return secretNumber;
+    }
+
+
+    function kill() public {
+        // Enable owner to kill the contract after 24 hours of inactivity
+        if (msg.sender == owner && now > lastPlayed + 24 hours) {
+            selfdestruct(msg.sender);
+        }
+    }
+}
No results found