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ballot.sol

pragma solidity >=0.4.22 <0.6.0;
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.
    constructor(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 view 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

import "remix_tests.sol"; // this import is automatically injected by Remix.
import "./ballot.sol";

contract test3 {
   
    Ballot ballotToTest;
    function beforeAll () public {
       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 view returns (bool) {
        return ballotToTest.winningProposal() == 1;
    }
}

mycontract.sol

pragma solidity 0.4.19;

contract MyContract{
    
    bool isAlive;
    address public owner;
    
    event LogSetIsAlive(address indexed sender, bool theNewState);
    event LogChangeOwner(address indexed sender, address theNewOwner);
    
    function MyContract() public{
        isAlive = true;
        owner = msg.sender;
    }
    
    function getIsAlive() public view returns (bool isIndeed){
        return isAlive;
    }
    
    function add(uint x, uint y) public pure returns (uint sum){
        return x+y;
    }
    
    
    function setIsAlive(bool newState) public returns (bool success){
        require(msg.sender == owner);
        isAlive = newState;
        LogSetIsAlive(msg.sender, newState);
        return true;
    }
    
    function changeOwner(address newOwner) public returns (bool success){
        require(msg.sender == owner);
        owner = newOwner;
        LogChangeOwner(msg.sender, newOwner);
        return true;
        
    }
    
}

mycontractinheritence.sol

pragma solidity 0.4.19;

contract Owned{
    address public owner;
      event LogChangeOwner(address indexed sender, address theNewOwner);
      
    modifier onlyOwner{
        require(msg.sender == owner);
        _;
    }
      
      function Owned() public {
          owner = msg.sender;
      }
      
      
        function changeOwner(address newOwner) public onlyOwner  returns (bool success){
        owner = newOwner;
        LogChangeOwner(msg.sender, newOwner);
        return true;
    }
}

contract Stoppable is Owned{
    bool isRunning;
    
    
    event LogPausedContract(address indexed sender);
    event LogResumeContract(address indexed sender);
    
    
    modifier onlyIfRunning{
        require(isRunning);
        _;
    }
    
    function Stoppable() public{
        isRunning = true;
    }
    
       function pauseContract() public onlyOwner onlyIfRunning returns (bool success){
        isRunning = false;
        LogPausedContract(msg.sender);
        return true;
    }
    
    function resumeContract() public onlyOwner returns (bool success){
        require(!isRunning);
        isRunning = true;
        LogResumeContract(msg.sender);
        return true;
    }
    
        
}

contract MyContract is Stoppable{
    
    bool isAlive;
    
    event LogSetIsAlive(address indexed sender, bool theNewState);
    
    function MyContract() public{
        isAlive = true;
            }
    
    function getIsAlive() public view returns (bool isIndeed){
        return isAlive;
    }
    
    function add(uint x, uint y) public pure returns (uint sum){
        return x+y;
    }
    
    
    function setIsAlive(bool newState) public onlyOwner onlyIfRunning returns (bool success){
        isAlive = newState;
        LogSetIsAlive(msg.sender, newState);
        return true;
    }
    
  
    
 
} //end of Contract

mycontractwithModifier.sol

pragma solidity 0.4.19;

contract MyContract{
    
    bool isAlive;
    bool isRunning;
    address public owner;
    
    event LogSetIsAlive(address indexed sender, bool theNewState);
    event LogChangeOwner(address indexed sender, address theNewOwner);
    event LogPausedContract(address indexed sender);
    event LogResumeContract(address indexed sender);
    
    
    modifier onlyOwner{
        require(msg.sender == owner);
        _;
    }
    
    modifier onlyIfRunning{
        require(isRunning);
        _;
    }
    
    function MyContract() public{
        isAlive = true;
        owner = msg.sender;
        isRunning = true;
    }
    
    function getIsAlive() public view returns (bool isIndeed){
        return isAlive;
    }
    
    function add(uint x, uint y) public pure returns (uint sum){
        return x+y;
    }
    
    
    function setIsAlive(bool newState) public onlyOwner onlyIfRunning returns (bool success){
        isAlive = newState;
        LogSetIsAlive(msg.sender, newState);
        return true;
    }
    
    function changeOwner(address newOwner) public onlyOwner onlyIfRunning returns (bool success){
        owner = newOwner;
        LogChangeOwner(msg.sender, newOwner);
        return true;
        
    }
    
    function pauseContract() public onlyOwner onlyIfRunning returns (bool success){
        isRunning = false;
        LogPausedContract(msg.sender);
        return true;
    }
    
    function resumeContract() public onlyOwner returns (bool success){
        require(!isRunning);
        isRunning = true;
        LogResumeContract(msg.sender);
        return true;
    }
    
} //end of Contract

piggybank.sol

pragma solidity 0.4.19;

contract PiggyBank {
    address owner;
    uint balance;
    bytes32 hashedPassword;

    function piggyBank(bytes32 _hashedPassword) {
        owner = msg.sender;
        balance += uint(msg.value);
        hashedPassword = _hashedPassword;
    }

    function deposit () payable {
        if (msg.sender != owner) revert();
        balance += uint(msg.value);
    }

    function kill(bytes32 password) {
        if (keccak256(owner, password) != hashedPassword) revert();
        selfdestruct(owner);
    }
}