re-add demo ballot

index.html

@@ -154,13 +154,67 @@ body {
         <div id="input">contract Ballot {
     struct Voter {
         uint weight;
-        bool voted
+        bool voted;
         uint8 vote;
         address delegate;
     }
     struct Proposal {
         uint voteCount;
     }
+
+    address chairperson;
+    mapping(address => Voter) voters;
+    Proposal[] proposals;
+
+    // Create a new ballot with $(_numProposals) different proposals.
+    function Ballot(uint8 _numProposals) {
+        chairperson = msg.sender;
+        voters[chairperson].weight = 1;
+        proposals.length = _numProposals;
+    }
+
+    // Give $(voter) the right to vote on this ballot.
+    // May only be called by $(chairperson).
+    function giveRightToVote(address voter) {
+        if (msg.sender != chairperson || voters[voter].voted) return;
+        voters[voter].weight = 1;
+    }
+
+    // Delegate your vote to the voter $(to).
+    function delegate(address to) {
+        Voter sender = voters[msg.sender]; // assigns reference
+        if (sender.voted) return;
+        while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender)
+            to = voters[to].delegate;
+        if (to == msg.sender) return;
+        sender.voted = true;
+        sender.delegate = to;
+        Voter delegate = voters[to];
+        if (delegate.voted)
+            proposals[delegate.vote].voteCount += sender.weight;
+        else
+            delegate.weight += sender.weight;
+    }
+
+    // Give a single vote to proposal $(proposal).
+    function vote(uint8 proposal) {
+        Voter sender = voters[msg.sender];
+        if (sender.voted || proposal >= proposals.length) return;
+        sender.voted = true;
+        sender.vote = proposal;
+        proposals[proposal].voteCount += sender.weight;
+    }
+
+    function winningProposal() constant returns (uint8 winningProposal) {
+        uint256 winningVoteCount = 0;
+        for (uint8 proposal = 0; proposal < proposals.length; proposal++) {
+            if (proposals[proposal].voteCount > winningVoteCount) {
+                winningVoteCount = proposals[proposal].voteCount;
+                winningProposal = proposal;
+            }
+            ++proposal;
+        }
+    }
 }
         </div>
     </div>