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ballot.sol

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;
            }
    }
}

CrowdFund.sol

pragma solidity 0.4.11;

contract CrowdFund {
    
    addres public beneficiary;
    uint public goal;
    uint public deadline;
    
    mapping(addres => uint) funder;
    
    addres[] totalFundersArr;
    
    event Contribution(uint _amount, uint _amountRemaining)
    
    function CrowdFund(addres _beneficiary, uint _goal, uint _deadline) {
        beneficiary = _beneficiary;
        goal = _goal;
        deadline = now + _deadline;
    }
    
    function currentFunding() constant returns (uint) {
        return this.balance;
    }
    
    function totalFunders() constant returns (uint) {
        return totalFundersArr.length;
    }
    
    function contribute() payable {
        if(funders[msg.sender] == 0) {
            totalFundersArr.push(msg.sender);
        }
        funders[msg.sender] += msg.value;
        Contribution(msg.value, goal - this.balance);
    }
    
    function payout() {
        if(now > deadline && this.balance >= goal) {
            beneficiary.transfer(this.balance);
        }
    }
    
    function refund() {
        if(now > deadline && this.balance < goal) {
            msg.sender.transfer(funders[msg.sender]);
            funders[msg.sender] = 0;
        }
    }
    
    function disable() {
        if (this.balance != 0) {
            throw;
        }
        selfdestruct(beneficiary);
    }
}

storage.sol

pragma solidity ^0.4.0;

contract SimpleStorage {
    uint storedData;

    function set(uint x) public {
        storedData = x;
    }

    function get() public view returns (uint) {
        return storedData;
    }
}