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Created using browser-solidity: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://ethereum.github.io/browser-solidity/#version=soljson-v0.4.21+commit.dfe3193c.js&optimize=false&gist=
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| pragma solidity ^0.4.0; | |
| contract Ballot { | |
| struct Voter { | |
| uint weight; | |
| 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) public { | |
| chairperson = msg.sender; | |
| voters[chairperson].weight = 1; | |
| proposals.length = _numProposals; | |
| } | |
| /// Give $(toVoter) the right to vote on this ballot. | |
| /// May only be called by $(chairperson). | |
| function giveRightToVote(address toVoter) public { | |
| if (msg.sender != chairperson || voters[toVoter].voted) return; | |
| voters[toVoter].weight = 1; | |
| } | |
| /// Delegate your vote to the voter $(to). | |
| function delegate(address to) public { | |
| Voter storage 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 storage delegateTo = voters[to]; | |
| if (delegateTo.voted) | |
| proposals[delegateTo.vote].voteCount += sender.weight; | |
| else | |
| delegateTo.weight += sender.weight; | |
| } | |
| /// Give a single vote to proposal $(toProposal). | |
| function vote(uint8 toProposal) public { | |
| Voter storage sender = voters[msg.sender]; | |
| if (sender.voted || toProposal >= proposals.length) return; | |
| sender.voted = true; | |
| sender.vote = toProposal; | |
| proposals[toProposal].voteCount += sender.weight; | |
| } | |
| function winningProposal() public constant returns (uint8 _winningProposal) { | |
| uint256 winningVoteCount = 0; | |
| for (uint8 prop = 0; prop < proposals.length; prop++) | |
| if (proposals[prop].voteCount > winningVoteCount) { | |
| winningVoteCount = proposals[prop].voteCount; | |
| _winningProposal = prop; | |
| } | |
| } | |
| } |
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| pragma solidity ^0.4.21; | |
| contract VisitCounter { | |
| uint256 private totalVisit; | |
| struct Visitor { | |
| string name; | |
| uint256 visitCount; | |
| } | |
| mapping (address => Visitor) visitors; | |
| address[] visitorAddrs; | |
| function VisitCounter() public { | |
| totalVisit = 0; | |
| } | |
| function visit(string _name) public { | |
| totalVisit++; | |
| // If this visitor already exists | |
| if(visitors[msg.sender].visitCount > 0) { | |
| visitors[msg.sender].visitCount++; | |
| return; | |
| } | |
| // _name must not be empty. | |
| assert(bytes(_name).length > 0); | |
| // <memory to storage> spends the least gas. | |
| // https://ethereum.stackexchange.com/questions/4467/initialising-structs-to-storage-variables | |
| Visitor memory visitor; | |
| visitor.name = _name; | |
| visitor.visitCount = 1; | |
| visitors[msg.sender] = visitor; | |
| // Store all visitor addresses | |
| // Push is only available in dynamic array | |
| visitorAddrs.push(msg.sender); | |
| } | |
| function viewTotalVisit() public view returns (uint256) { | |
| return totalVisit; | |
| } | |
| // To return fixed size array, we have to put the size of the array we declared like this: address[30] | |
| function viewAllVisitorAddresses() public view returns (address[]) { | |
| return visitorAddrs; | |
| } | |
| } |
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