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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;
            }
    }
}

ballot_test.sol

pragma solidity ^0.4.7;
import "remix_tests.sol"; // this import is automatically injected by Remix.
import "./ballot.sol";

contract test3 {
   
    Ballot ballotToTest;
    function beforeAll () {
       ballotToTest = new Ballot(2);
    }
    
    function checkWinningProposal () public {
        ballotToTest.vote(1);
        Assert.equal(ballotToTest.winningProposal(), uint(1), "1 should be the winning proposal");
    }
    
    function checkWinninProposalWithReturnValue () public constant returns (bool) {
        return ballotToTest.winningProposal() == 1;
    }
}

TestToken.sol

pragma solidity ^0.4.0;
// https://medium.com/coinmonks/create-your-own-cryptocurrency-in-ethereum-blockchain-40865db8a29f

contract owned {
    address public owner;
    
    constructor() public {
        owner = msg.sender;
    }
    
    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }
    
    function transferableOwnership(address newOwner) onlyOwner public {
        owner = newOwner;
    }
}

interface tokenRecepient {
    function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external;
}

contract TokenERC20 {
    // In this all methods of ERC20 is defined and implemented
    
    // Public variables of Token
    string public name;
    string public symbol;
    uint8 public decimal = 18; // 18 decimal values is strongly suggested. Avoid changing it
    
    uint256 public totalSupply;
    
    // This creates an array with all balances
    mapping (address => uint256) public balanceof;
    mapping (address => mapping (address => uint256)) public allowance;
    
    // This generates a public events on blockchain that will notify clients
    event Transfer(address indexed from, address indexed to , uint256 value);
    
    // This generates a public events on blockchain that will notify clients
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
    
    // This notified client about the amount burns
    // Burn methods is used when we want to destroy unsold tokens
    event Burn(address indexed From, uint256 value);
    
    /** 
     * constructor function
     * 
     * Initializes contract with initial supply tokens with creator of contract
     */ 
    
    constructor(uint256 initialSupply, string tokenName, string tokenSymbol) public {
        totalSupply = initialSupply * 10 ** uint256(decimal); // update total supply with decimal amount
        balanceof[msg.sender] = totalSupply; // Give the creator all initial token
        name = tokenName; // the name for display purpose
        symbol = tokenSymbol; // the symbol for display purpose
    }
    
    /**
     * Internal transfer, only can be handled by this contract
     */
     
     function _transfer(address _from, address _to, uint _value) internal {
         // Prevent transfer to 0x0 address. Use burn() instead
         require(_to != 0x0);
         
         // Check if the sender has enough
         require(balanceof[_from] >= _value);
         
         // Check for overflow
         require(balanceof[_to] + _value > balanceof[_to]);
         
         // Save this for assestion in future
         uint previousBalances = balanceof[_from] + balanceof[_to];
         
         // Subtract from the sender
         balanceof[_from] -= _value;
         
         // Add the same to the recipient
         balanceof[_to] += _value;
         
         emit Transfer(_from, _to, _value);

         // Assert are used to use static analysis to find bugs in your code. They should never fail.
         assert(balanceof[_to] + balanceof[_from] == previousBalances);
         
     }
     
     /**
      * Token Transfer 
      * 
      * Send '_value' tokens to '_to' in behalf of '_from'
      * 
      * @param _to The address of the receiver
      * @param _value the amount to send
      * 
      */ 
      
      function transfer(address _to, uint256 _value) public returns (bool success) {
          _transfer(msg.sender, _to, _value);
          return true;
      }
      
      /**
      * Token Transfer from other Address
      * 
      * Send '_value' tokens to '_to' in behalf of '_from'
      * 
      * @param _from The address of the sender
      * @param _to The address of the receiver
      * @param _value the amount to send
      * 
      */ 
      
      function transferFrom(address _to, address _from ,uint256 _value) public returns (bool success) {
          require(_value <= allowance[_from][msg.sender]); // check allowance
          _transfer(_from, _to, _value);
          return true;
      }
      
      /**
      * Set allowance for other address
      * 
      * Allows `_spender` to spend no more than `_value` tokens in your behalf
      * 
      * @param _spender The address authorized to spend
      * @param _value the max amount they can spend
      * 
      */ 
      
      function approve(address _spender, uint256 _value) public returns (bool success) {
          allowance[msg.sender][_spender] = _value;
          emit Approval(msg.sender, _spender, _value);
          return true;
      }
      
      
      /**
      * Set allowance for other address and notify
      *
      * Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it
      *
      * @param _spender The address authorized to spend
      * @param _value the max amount they can spend
      * @param _extraData some extra information to send to the approved contract
      */
      
      function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {
          tokenRecepient spender = tokenRecepient(_spender);
          if(approve(_spender, _value)) {
              spender.receiveApproval(msg.sender, _value, this, _extraData);
              return true;
          }
      }
      
      /**
       * 
       * Remove '_value' token from the system irreversibly
       * 
       * @param _value the amount to burn
       *
       */
       
       function burn(uint256 _value) public returns (bool success) {
           require(balanceof[msg.sender] >= _value); // Check if sender has enough
           balanceof[msg.sender] -= _value; // Subtract from the sender
           totalSupply -= _value; // Updates total supply
           emit Burn(msg.sender, _value);
           return true;
       }
       
       
      /**
      * Destroy tokens from other account
      *
      * Remove `_value` tokens from the system irreversibly on behalf of `_from`.
      *
      * @param _from the address of the sender
      * @param _value the amount of money to burn
      */
      
       function burnFrom(address _from, uint256 _value) public returns (bool success) {
          require(balanceof[_from] >= _value); // Check if targeted balance is enough
          require(_value <= allowance[_from][msg.sender]); // Check allowance
          balanceof[_from] -= _value; // Subtract from the targeted balanceof
          allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance
          totalSupply -= _value; // Update totalSupply
          emit Burn(_from, _value);
          return true;
       }
}

        contract Sikka is owned, TokenERC20 {
          uint256 public sellPrice;
          uint256 public buyPrice;
          
          mapping(address => bool) public frozenAccount;
          
          /* This generates a public event in blockchain that will notify clients */
          
          event FrozenFunds(address target, bool frozen);
          
          /* Initialize contract with initial supply tokens to the creator of the contract */
          
          constructor(
              uint256 initialSupply,
              string tokenName,
              string tokenSymbol
            ) TokenERC20(initialSupply, tokenName, tokenSymbol) public {}
            
            /* Internal transfer, only can be called by this contract */
            
        function _transfer(address _from, address _to, uint _value) internal {
            require (_to != 0x0);                               // Prevent transfer to 0x0 address. Use burn() instead
            require (balanceof[_from] >= _value);               // Check if the sender has enough
            require (balanceof[_to] + _value >= balanceof[_to]); // Check for overflows
            require(!frozenAccount[_from]);                     // Check if sender is frozen
            require(!frozenAccount[_to]);                       // Check if recipient is frozen
            balanceof[_from] -= _value;                         // Subtract from the sender
            balanceof[_to] += _value;                           // Add the same to the recipient
            emit Transfer(_from, _to, _value);
        }
        
        /// @notice Create `mintedAmount` tokens and send it to `target`
    /// @param target Address to receive the tokens
    /// @param mintedAmount the amount of tokens it will receive
    function mintToken(address target, uint256 mintedAmount) onlyOwner public {
        balanceof[target] += mintedAmount;
        totalSupply += mintedAmount;
        emit Transfer(0, this, mintedAmount);
        emit Transfer(this, target, mintedAmount);
    }
    
/// @notice `freeze? Prevent | Allow` `target` from sending & receiving tokens
    /// @param target Address to be frozen
    /// @param freeze either to freeze it or not
    function freezeAccount(address target, bool freeze) onlyOwner public {
        frozenAccount[target] = freeze;
        emit FrozenFunds(target, freeze);
    }
    
    
/// @notice Allow users to buy tokens for `newBuyPrice` eth and sell tokens for `newSellPrice` eth
    /// @param newSellPrice Price the users can sell to the contract
    /// @param newBuyPrice Price users can buy from the contract
    function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner public {
        sellPrice = newSellPrice;
        buyPrice = newBuyPrice;
    }
/// @notice Buy tokens from contract by sending ether
    function buy() payable public {
        uint amount = msg.value / buyPrice;               // calculates the amount
        _transfer(this, msg.sender, amount);              // makes the transfers
    }
/// @notice Sell `amount` tokens to contract
    /// @param amount amount of tokens to be sold
    function sell(uint256 amount) public {
        address myAddress = this;
        require(myAddress.balance >= amount * sellPrice);      // checks if the contract has enough ether to buy
        _transfer(msg.sender, this, amount);              // makes the transfers
        msg.sender.transfer(amount * sellPrice);          // sends ether to the seller. It's important to do this last to avoid recursion attacks
    }
}