Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.4.25+commit.59dbf8f1.js&optimize=false&gist=

aLoteria.sol

pragma solidity >=0.4.22;
// Versão Final Loteria / Solidity 
contract Loteria {
    address dono;
    string nomeDoDono;
    uint inicio;
    
    struct Sorteio {
        uint data;
        uint numeroSorteado;
        address remetente;
        uint countPalpites;
    }
    
    Sorteio [] sorteios;
    
    mapping (address => uint) palpites;
    address [] palpiteiros;
    address [] ganhadores;
    
    constructor (string _nome) public {
        dono = msg.sender;
        nomeDoDono = _nome;
        inicio = now;
    }
    
    modifier apenasDono() {
        require (msg.sender == dono, "Apenas o dono do contrato pode fazer isso");
        _;
    }
    
    modifier excetoDono(){
        require (msg.sender != dono, "O dono do contrato não pode fazer isso");
        _;
    }
    
    event TrocoEnviado(address pagante, uint troco);
    event PalpiteRegistrado(address remetente, uint palpite);
    
    function enviarPalpite(uint palpiteEnviado) payable public { //excetoDono(){
        require (palpiteEnviado >= 1 && palpiteEnviado <=4, "Você tem que escolher um número entre 1 e 4");
        
        require (palpites[msg.sender] == 0, "Apenas um palpite pode ser enviado por sorteio");
        
        require (msg.value >= 1 ether, "A taxa para palpitar é 1 ether");
        
        //Calcula e envia troco
        uint troco = msg.value - 1 ether;
        if (troco > 0){
            msg.sender.transfer(troco);
            emit TrocoEnviado(msg.sender, troco);
        }
        
        // registra o palpite
        palpites[msg.sender] = palpiteEnviado;
        palpiteiros.push(msg.sender);
        emit PalpiteRegistrado(msg.sender, palpiteEnviado);
    }
    
    function verificarMeuPalpite() view public returns(uint palpite){
        require (palpites[msg.sender] >0 , "Você não tem palpite ainda para esse sorteio");
        
        return palpites[msg.sender];
    }
    
    function contarPalpites() view public returns(uint count){
        return palpiteiros.length;
    }
    
    event SorteioPostado(uint resultado);
    event PremiosEnviados(uint premioTotal, uint premioIndividual);
    
    function sortear() public apenasDono() returns(uint8 _numeroSorteado) {
        require (now > inicio + 1 minutes, "O sorteio só pode ser feito depois de um intervalo de 1 minuto");
        
        require(palpiteiros.length >=1, "Um mínimo de 1 pessoa é exida para poder sortear");
        
    // sortear um numeroSorteado
        uint8 numeroSorteado = uint8(keccak256(abi.encodePacked(blockhash(block.number-1))))/64+1; //1
        
        sorteios.push(Sorteio({
            data:now,
            numeroSorteado: numeroSorteado,
            remetente: msg.sender,
            countPalpites: palpiteiros.length
        }));
        emit SorteioPostado(numeroSorteado);
        
        // procura os ganhadores
        for (uint p=0; p<palpiteiros.length;p++){
            address palpiteiro = palpiteiros[p];
            if (palpites[palpiteiro] == numeroSorteado){
                ganhadores.push(palpiteiro);
            }
            delete palpites[palpiteiro];
        }
        
        uint premioTotal = address(this).balance;
        
        if (ganhadores.length > 0) {
            uint premio = premioTotal / ganhadores.length;
            
            // envia os premios 
            for (p=0; p<ganhadores.length; p++) {
                ganhadores[p].transfer(premio);
            }
            emit PremiosEnviados(premioTotal, premio);
        }
        
        // resetar o Sorteio
        delete palpiteiros;
        delete ganhadores;
        
        return numeroSorteado;
}

    function kill () public apenasDono(){
        dono.transfer(address(this).balance);
        selfdestruct(dono);
    }
    }

Array.sol

pragma solidity ^0.4.0;

contract ArraySol {
    address  dono;
    uint numeroSorteado;
    uint contadorDeSorteios = 0;
    
    uint [ ] numerosSorteados;
    
    constructor (uint numeroInicial) public payable comCustoMinimo (1000) {
        dono = msg.sender;
        set(numeroInicial);
        
    }

    
    event TrocoEnviado(address pagador, uint troco);
    
    function set(uint enviado) public payable comCustoMinimo(1000) {
        numeroSorteado = enviado;
        contadorDeSorteios++;
        numerosSorteados.push(enviado);

    if (msg.value > 1000){
        uint troco = msg.value - 1000;
        msg.sender.transfer(troco);
        emit TrocoEnviado(msg.sender, troco);
    }
    }
    
    modifier comCustoMinimo(uint min) {
        require(msg.value >= min, "Nao foi enviado Ether suficiente.");
    _;
  }
  function get() public view returns ( 
      address _donoDoContrato,
      uint _ultimoNumeroSorteado,
      uint _contadorDeSorteios,
      uint _saldoEmWei,
      uint[] _todosNumerosSorteados)
      
      {
          uint ultimo = numerosSorteados[contadorDeSorteios-1];
          
          return (dono, 
                  ultimo, 
                  contadorDeSorteios, 
                  address(this).balance, 
                  numerosSorteados
                );
    
      }
      
    function kill() public {
        require (msg.sender == dono);
        selfdestruct(dono);
    }
}

Array_TEst.sol

pragma solidity ^0.4.0;

contract GuardaLoteria {
  address dono;
  uint numeroSorteado;
  uint contadorDeSorteios = 0;

  uint[] numerosSorteados;

  constructor(uint numeroInicial) public payable comCustoMinimo(1000) {
    require (msg.sender.balance > 99.99999999999 ether);

    dono = msg.sender;
    set(numeroInicial);    
  }

  event TrocoEnviado(address pagador, uint troco);

  function set(uint enviado) public payable comCustoMinimo(1000) {
    numeroSorteado = enviado;
    contadorDeSorteios++;
    numerosSorteados.push(enviado);

    if (msg.value > 1000){
      uint troco = msg.value - 1000;
      msg.sender.transfer(troco);       
      emit TrocoEnviado(msg.sender, troco);
    }
  }

  modifier comCustoMinimo(uint min) {
    require(msg.value >= min, "Nao foi enviado Ether suficiente.");
    _;
  }

  function get() public view returns (
    address _donoDoContrato,
    uint _ultimoNumeroSorteado,
    uint _contadorDeSorteios,
    uint _saldoEmWei,
    uint[] _todosNumerosSorteados
  ) {
      uint ultimo = numerosSorteados[contadorDeSorteios-1];
      return (dono, ultimo, contadorDeSorteios, address(this).balance, numerosSorteados);
  }

  function kill () public {    
    require (msg.sender == dono);
    selfdestruct(dono);            
  }
}

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;
    }
}

Constructor.sol

pragma solidity >=0.4.23;

contract Construtor {
 uint numeroSorteado;
 
 constructor(uint numeroInicial) public {
     numeroSorteado = numeroInicial;
}
 function set(uint enviado) public {
     numeroSorteado = enviado;
 }
 function get() public view returns (uint){
     return numeroSorteado;
 }
}

Constructor2.sol

pragma solidity >=0.4.23;

contract GuardaLoteria {
    uint numeroSorteado;
    address dono;
    uint contadorDeSorteios = 0;
    bool donoRico = false;
    
    constructor (uint numeroInicial) public {
    require (msg.sender.balance > 9.99999999999 ether);
    
    // 9.99999999999
    
    numeroSorteado = numeroInicial;
    dono = msg.sender;
    contadorDeSorteios = 1;
    
    if (msg.sender.balance > 20 ether){
        donoRico = true;
    }
    else {
        donoRico = false;
    }
}

function set (uint enviado) public {
    numeroSorteado = enviado;
    contadorDeSorteios++;
    dono = msg.sender;
}

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


function getContador() public view returns(uint) {
    return contadorDeSorteios;
}

function getDono()  public view returns(address) {
    return dono;
}

function getRico() public view returns(bool) {
    return donoRico;
}
}

GuardaLoteria.sol

pragma solidity >=0.4.22 <0.6.0;

contract GuardaLoteria {
    uint numeroSorteado;

    function set(uint enviado) public {
        numeroSorteado = enviado;
    }
    
    function get() public view returns (uint) {
        return numeroSorteado;
    
        
    }
}

GuardaLoteria1.sol

pragma solidity >=0.4.22 <0.6.0;

contract GuardaLoteria1 {
    uint numeroSorteado;
    address dono;
    uint contadorDeSorteios = 0;
    bool donoRico = false;
    
    constructor(uint numeroInicial) public{
        require (msg.sender.balance > 99.99999999999 ether);
        
        numeroSorteado = numeroInicial;
        dono = msg.sender;
        contadorDeSorteios = 1;
        
        if (msg.sender.balance > 20 ether){
            donoRico = true;
        }
        else {
            donoRico = false;
        }
    }

    function set(uint enviado) public {
        numeroSorteado = enviado;
        contadorDeSorteios++;   
    }
    
    function get() public view returns (uint) {
        return numeroSorteado;
    
    }
    
    function getContador() public view returns (uint){
        return contadorDeSorteios;
        
    }
    
    function getDono()  public view returns (address){
        return dono;
    }
    
    function getRico() public view returns (bool){
        return donoRico;
    }
    
}

GuardaLoteriaV3.sol

pragma solidity >=0.4.0;

contract GuardaLoteriaV3 {
    uint numeroSorteado;
    
    function set (uint enviado) public {
        numeroSorteado = enviado;
    }
        
    function get() public view returns (uint){
        return numeroSorteado;
    }
}

inbox.sol

pragma solidity >=0.4.23;
contract Inbox{
  //  string public message ="Meatcoin v0.1 09/06/2018 Fazenda 01/2019 Gados Vacas";
 string public message;
 
    
    function Inbox(string initialMessage) public {
        message= initialMessage;
    }
    
    function setMessage(string newMessage) public {
        message = newMessage;
    }
}

MeatCoin.sol

pragma solidity >=0.4.25;
// Versão Teste  / MeatCoin 0.0.1
contract MeatCoin {
    address dono;
    string nomeDoDono;
    uint SaldoMeatCoin;
    uint Transacao = 0;
    uint inicio;
    
    
    constructor (uint MeatCoinInicial) public {
        dono = msg.sender;
        SaldoMeatCoin = MeatCoinInicial;
        inicio = now;
    }
    
     function SaldoExchange() view public returns (uint){
         return SaldoMeatCoin;
        
    }
     function CompraMeatCoin(uint compra)  public {
        SaldoMeatCoin = SaldoMeatCoin - compra;
        Transacao++;
    }
    
    function GetTransacao() view public returns (uint){
        return Transacao;
    }
}

contract MappingCompraToken {
    mapping(address => uint) public CampraToken;
    
    function updade(uint NewCompra) public {
        CompraToken[msg.sender] = newCompra;
    }
}

contract MappingUser {
    function f() puclic returns (uint) {
        MappingExample m = new MappingCompraToken();
        m.update(100);
        return m.campraToken(this);
        
    }
}

MeatCoin_Old.sol

pragma solidity >=0.4.23;

contract MeatCoin {
    uint numeroSorteado;
    address dono;
    uint contadorDeSorteios = 0;
    bool donoRico = false;
    
    constructor (uint numeroInicial) public {
    require (msg.sender.balance > 9.99999999999 ether);
    
    // 9.99999999999
    
    numeroSorteado = numeroInicial;
    dono = msg.sender;
    contadorDeSorteios = 1;
    
    if (msg.sender.balance > 20 ether){
        donoRico = true;
    }
    else {
        donoRico = false;
    }
}

function set (uint enviado) public {
    numeroSorteado = enviado;
    contadorDeSorteios++;
    dono = msg.sender;
}

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


function getContador() public view returns(uint) {
    return contadorDeSorteios;
}

function getDono()  public view returns(address) {
    return dono;
}

function getRico() public view returns(bool) {
    return donoRico;
}
}

overflow.sol

pragma solidity ^0.4.23;


contract FlowOver  {
    uint16 numeroSorteado;       
    uint numeroSorteadoGrande;
    uint16 contadorDeSorteios;
    address dono;

    constructor (uint16 numeroInicial) public {
        numeroSorteado = numeroInicial;                       // 0 a 65535
        contadorDeSorteios = 65530;                           // 0 a 2^256-1
        dono = msg.sender;
    }
    
    function set(uint enviado) public payable {
        numeroSorteadoGrande = enviado;
        numeroSorteado = uint16(enviado);
        require (msg.sender == dono , "Apenas o dono do contrato pode setar");
        require ( contadorDeSorteios +1 > contadorDeSorteios , "Overflow no contador");
        require ( numeroSorteado == numeroSorteadoGrande , "Overflow no numero");
        contadorDeSorteios++;
        
    }
    
    
      function get() public view returns (uint _numero, uint _numeroSorteadoGrande, uint16 _contador, address _dono, address _contrato, uint _saldo) {
      return (numeroSorteado,
              numeroSorteadoGrande,
              contadorDeSorteios,
              dono,
              this,
              address(this).balance);
  }
}

overflow3.sol

pragma solidity ^0.4.0;

contract Overflow {
  uint16 numeroSorteado;       // 0 a 65535 
  uint numeroSorteadoGrande;   // 0 a  2^256 -1 ou (1.1579208923731619542357098500869e+77 – 1)

  uint16 contadorDeSorteios;

  address dono;

constructor(uint16 numeroInicial) public {
  	numeroSorteado = numeroInicial;
  	contadorDeSorteios = 65530;
  	dono = msg.sender;
  }  

  function set(uint enviado) public payable {
    numeroSorteadoGrande = enviado;
    numeroSorteado = uint16(enviado);

    require (msg.sender == dono, "apenas o dono do contrato pode setar");

    require (contadorDeSorteios + 1 > contadorDeSorteios, "overflow no contador");
    require (numeroSorteado == numeroSorteadoGrande, "overflow no numero");

    contadorDeSorteios++;
  }

  function get() public view returns (uint _numero, uint _numeroSorteadoGrande, uint16 _contador, address _dono, address _contrato, uint _saldo) {
      return (numeroSorteado,
              numeroSorteadoGrande,
              contadorDeSorteios,
              dono,
              this,
              address(this).balance);
  }
}

scenario.json

{
  "accounts": {
    "account{2}": "0x4b0897b0513fdc7c541b6d9d7e929c4e5364d2db",
    "account{3}": "0x583031d1113ad414f02576bd6afabfb302140225",
    "account{4}": "0xdd870fa1b7c4700f2bd7f44238821c26f7392148"
  },
  "linkReferences": {},
  "transactions": [
    {
      "timestamp": 1555314485885,
      "record": {
        "value": "0",
        "parameters": [
          ""
        ],
        "abi": "0xc41589e7559804ea4a2080dad19d876a024ccb05117835447d72ce08c1d020ec",
        "contractName": "Loteria",
        "bytecode": "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",
        "linkReferences": {},
        "name": "",
        "inputs": "(string)",
        "type": "constructor",
        "from": "account{2}"
      }
    },
    {
      "timestamp": 1555314506177,
      "record": {
        "value": "20000000000000000000",
        "parameters": [
          "2"
        ],
        "to": "created{1555314485885}",
        "abi": "0xc41589e7559804ea4a2080dad19d876a024ccb05117835447d72ce08c1d020ec",
        "name": "enviarPalpite",
        "inputs": "(uint256)",
        "type": "function",
        "from": "account{2}"
      }
    },
    {
      "timestamp": 1555314785691,
      "record": {
        "value": "0",
        "parameters": [
          "3"
        ],
        "to": "created{1555314485885}",
        "abi": "0xc41589e7559804ea4a2080dad19d876a024ccb05117835447d72ce08c1d020ec",
        "name": "enviarPalpite",
        "inputs": "(uint256)",
        "type": "function",
        "from": "account{2}"
      }
    },
    {
      "timestamp": 1555314805358,
      "record": {
        "value": "2000000000000000000",
        "parameters": [
          "3"
        ],
        "to": "created{1555314485885}",
        "abi": "0xc41589e7559804ea4a2080dad19d876a024ccb05117835447d72ce08c1d020ec",
        "name": "enviarPalpite",
        "inputs": "(uint256)",
        "type": "function",
        "from": "account{3}"
      }
    },
    {
      "timestamp": 1555314925917,
      "record": {
        "value": "5000000000000000000",
        "parameters": [
          "4"
        ],
        "to": "created{1555314485885}",
        "abi": "0xc41589e7559804ea4a2080dad19d876a024ccb05117835447d72ce08c1d020ec",
        "name": "enviarPalpite",
        "inputs": "(uint256)",
        "type": "function",
        "from": "account{4}"
      }
    }
  ],
  "abis": {
    "0xc41589e7559804ea4a2080dad19d876a024ccb05117835447d72ce08c1d020ec": [
      {
        "constant": false,
        "inputs": [
          {
            "name": "palpiteEnviado",
            "type": "uint256"
          }
        ],
        "name": "enviarPalpite",
        "outputs": [],
        "payable": true,
        "stateMutability": "payable",
        "type": "function"
      },
      {
        "inputs": [
          {
            "name": "_nome",
            "type": "string"
          }
        ],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "constructor"
      },
      {
        "anonymous": false,
        "inputs": [
          {
            "indexed": false,
            "name": "pagante",
            "type": "address"
          },
          {
            "indexed": false,
            "name": "troco",
            "type": "uint256"
          }
        ],
        "name": "TrocoEnviado",
        "type": "event"
      },
      {
        "anonymous": false,
        "inputs": [
          {
            "indexed": false,
            "name": "remetente",
            "type": "address"
          },
          {
            "indexed": false,
            "name": "palpite",
            "type": "uint256"
          }
        ],
        "name": "PalpiteRegistrado",
        "type": "event"
      },
      {
        "constant": true,
        "inputs": [],
        "name": "verificarMeuPalpite",
        "outputs": [
          {
            "name": "palpite",
            "type": "uint256"
          }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
      }
    ]
  }
}

scenario3.json

{
  "accounts": {
    "account{0}": "0xca35b7d915458ef540ade6068dfe2f44e8fa733c",
    "account{1}": "0x14723a09acff6d2a60dcdf7aa4aff308fddc160c"
  },
  "linkReferences": {},
  "transactions": [
    {
      "timestamp": 1555334760386,
      "record": {
        "value": "0",
        "parameters": [
          ""
        ],
        "abi": "0xad315e209dd62516ab8c7d1c2d8c3c206525501ebef91d12c34431f9ea255371",
        "contractName": "Loteria",
        "bytecode": "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",
        "linkReferences": {},
        "name": "",
        "inputs": "(string)",
        "type": "constructor",
        "from": "account{0}"
      }
    },
    {
      "timestamp": 1555334832503,
      "record": {
        "value": "1000000000000000000",
        "parameters": [
          ""
        ],
        "abi": "0xad315e209dd62516ab8c7d1c2d8c3c206525501ebef91d12c34431f9ea255371",
        "contractName": "Loteria",
        "bytecode": "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",
        "linkReferences": {},
        "name": "",
        "inputs": "(string)",
        "type": "constructor",
        "from": "account{1}"
      }
    },
    {
      "timestamp": 1555334849970,
      "record": {
        "value": "0",
        "parameters": [
          "2"
        ],
        "to": "created{1555334760386}",
        "abi": "0xad315e209dd62516ab8c7d1c2d8c3c206525501ebef91d12c34431f9ea255371",
        "name": "enviarPalpite",
        "inputs": "(uint256)",
        "type": "function",
        "from": "account{1}"
      }
    },
    {
      "timestamp": 1555334886723,
      "record": {
        "value": "1000000000000000000",
        "parameters": [
          "3"
        ],
        "to": "created{1555334760386}",
        "abi": "0xad315e209dd62516ab8c7d1c2d8c3c206525501ebef91d12c34431f9ea255371",
        "name": "enviarPalpite",
        "inputs": "(uint256)",
        "type": "function",
        "from": "account{1}"
      }
    }
  ],
  "abis": {
    "0xad315e209dd62516ab8c7d1c2d8c3c206525501ebef91d12c34431f9ea255371": [
      {
        "constant": false,
        "inputs": [
          {
            "name": "palpiteEnviado",
            "type": "uint256"
          }
        ],
        "name": "enviarPalpite",
        "outputs": [],
        "payable": true,
        "stateMutability": "payable",
        "type": "function"
      },
      {
        "constant": false,
        "inputs": [],
        "name": "sortear",
        "outputs": [
          {
            "name": "_numeroSorteado",
            "type": "uint8"
          }
        ],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "function"
      },
      {
        "inputs": [
          {
            "name": "_nome",
            "type": "string"
          }
        ],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "constructor"
      },
      {
        "anonymous": false,
        "inputs": [
          {
            "indexed": false,
            "name": "pagante",
            "type": "address"
          },
          {
            "indexed": false,
            "name": "troco",
            "type": "uint256"
          }
        ],
        "name": "TrocoEnviado",
        "type": "event"
      },
      {
        "anonymous": false,
        "inputs": [
          {
            "indexed": false,
            "name": "remetente",
            "type": "address"
          },
          {
            "indexed": false,
            "name": "palpite",
            "type": "uint256"
          }
        ],
        "name": "PalpiteRegistrado",
        "type": "event"
      },
      {
        "anonymous": false,
        "inputs": [
          {
            "indexed": false,
            "name": "resultado",
            "type": "uint256"
          }
        ],
        "name": "SorteioPostado",
        "type": "event"
      },
      {
        "anonymous": false,
        "inputs": [
          {
            "indexed": false,
            "name": "premioTotal",
            "type": "uint256"
          },
          {
            "indexed": false,
            "name": "premioIndividual",
            "type": "uint256"
          }
        ],
        "name": "PremiosEnviados",
        "type": "event"
      },
      {
        "constant": true,
        "inputs": [],
        "name": "contarPalpites",
        "outputs": [
          {
            "name": "count",
            "type": "uint256"
          }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
      },
      {
        "constant": true,
        "inputs": [],
        "name": "verificarMeuPalpite",
        "outputs": [
          {
            "name": "palpite",
            "type": "uint256"
          }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
      }
    ]
  }
}

scenarioloteria.json

{
  "accounts": {
    "account{2}": "0x4b0897b0513fdc7c541b6d9d7e929c4e5364d2db"
  },
  "linkReferences": {},
  "transactions": [
    {
      "timestamp": 1555314485885,
      "record": {
        "value": "0",
        "parameters": [
          ""
        ],
        "abi": "0xc41589e7559804ea4a2080dad19d876a024ccb05117835447d72ce08c1d020ec",
        "contractName": "Loteria",
        "bytecode": "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",
        "linkReferences": {},
        "name": "",
        "inputs": "(string)",
        "type": "constructor",
        "from": "account{2}"
      }
    },
    {
      "timestamp": 1555314506177,
      "record": {
        "value": "20000000000000000000",
        "parameters": [
          "2"
        ],
        "to": "created{1555314485885}",
        "abi": "0xc41589e7559804ea4a2080dad19d876a024ccb05117835447d72ce08c1d020ec",
        "name": "enviarPalpite",
        "inputs": "(uint256)",
        "type": "function",
        "from": "account{2}"
      }
    }
  ],
  "abis": {
    "0xc41589e7559804ea4a2080dad19d876a024ccb05117835447d72ce08c1d020ec": [
      {
        "constant": false,
        "inputs": [
          {
            "name": "palpiteEnviado",
            "type": "uint256"
          }
        ],
        "name": "enviarPalpite",
        "outputs": [],
        "payable": true,
        "stateMutability": "payable",
        "type": "function"
      },
      {
        "inputs": [
          {
            "name": "_nome",
            "type": "string"
          }
        ],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "constructor"
      },
      {
        "anonymous": false,
        "inputs": [
          {
            "indexed": false,
            "name": "pagante",
            "type": "address"
          },
          {
            "indexed": false,
            "name": "troco",
            "type": "uint256"
          }
        ],
        "name": "TrocoEnviado",
        "type": "event"
      },
      {
        "anonymous": false,
        "inputs": [
          {
            "indexed": false,
            "name": "remetente",
            "type": "address"
          },
          {
            "indexed": false,
            "name": "palpite",
            "type": "uint256"
          }
        ],
        "name": "PalpiteRegistrado",
        "type": "event"
      },
      {
        "constant": true,
        "inputs": [],
        "name": "verificarMeuPalpite",
        "outputs": [
          {
            "name": "palpite",
            "type": "uint256"
          }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
      }
    ]
  }
}

struct.sol

pragma solidity >=0.4.23;

contract StructSol {
    address dono;
    
    struct Sorteio {
        uint data;
        uint numeroSorteado;
        address remetente;
    }
    
    Sorteio [] sorteios;
    
    constructor(uint numeroInicial) public {
        dono = msg.sender;
        set(numeroInicial);
    }
    
    function set(uint enviado) public {
        sorteios.push(Sorteio({
            data: now,
            numeroSorteado: enviado,
            remetente: msg.sender
        }));
        
    }

    function get() public view returns (
        address _donoDoContrato,
        uint _ultimoSorteado,
        uint _ultimaData,
        address _ultimoRemetente,
        uint _numeroDeSorteios
    ){
        Sorteio memory ultimo = sorteios[sorteios.length-1];
        return(
            dono,
            ultimo.numeroSorteado,
            ultimo.data,
            ultimo.remetente,
            sorteios.length
        );
    }   
  function kill() public {
        require (msg.sender == dono);
        selfdestruct(dono);
    }   
        
}

Token_ERC20.sol

pragma solidity 0.4.25;

/**
    HRC20Token Standard Token implementation
*/
contract TokenBeta {

    string public name = 'TokenBeta'; // Change it to your Token Name.
    string public symbol = 'TBeta'; // Change it to your Token Symbol. Max 4 letters!
    
    string public standard = 'Token Beta 0.1'; // Do not change this one.

    uint8 public decimals = 0; // It's recommended to set decimals to 8.
    
    uint256 public totalSupply = 100000000; // Change it to the Total Supply of your Token.

    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) public allowance;

    // This generates a public event on the blockchain that will notify clients
    event Transfer(address indexed _from, address indexed _to, uint256 _value);

    /**
     * Constructor function
     *
     * Initializes contract with initial supply tokens to the creator of the contract
     */
    constructor() public {
        totalSupply =  totalSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount

        balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens
    }

    /**
     * Internal transfer, only can be called 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 overflows
        require(balanceOf[_to] + _value >= balanceOf[_to]);
        // Save this for an assertion in the 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);
        // Asserts are used to use static analysis to find bugs in your code. They should never fail
        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }

    /**
     * Transfer tokens
     *
     * Send `_value` tokens to `_to` from your account
     *
     * @param _to The address of the recipient
     * @param _value the amount to send
     */
    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }

    /**
     * Transfer tokens from other address
     *
     * Send `_value` tokens to `_to` on behalf of `_from`
     *
     * @param _from The address of the sender
     * @param _to The address of the recipient
     * @param _value the amount to send
     */
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= allowance[_from][msg.sender]);     // Check allowance
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }

    /**
     * Set allowance for other address
     *
     * Allows `_spender` to spend no more than `_value` tokens on 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;
        return true;
    }

    // disable pay HTMLCOIN to this contract
    function () public payable {
        revert();
    }
}

TokenTicketERC20.sol

pragma solidity ^0.4.17;

contract ERC20Interface {
    function totalSupply() public view returns(uint16 totalSupply);

    function balanceOf(address _tokenOwner) public view returns(uint16 balance);

    function allowance(address _tokenOwner, address _spender) public view returns(uint16 remainig);

    function transfer(address _to, uint16 tokens) public returns(bool);
    
    function approve(address _spender, uint16 _tokens) public returns (bool);
    
    function transferFrom(address from, address to, uint16 _tokens) public returns(bool);

    event Transfer(address from, address to, uint16 tokens);

    event Approval(address tokenOwner, address spender, uint16 tokens);
}

contract TicketERC20 is ERC20Interface {
    string public name;
    string public symbol;
    uint16 public totalSupply;
    address public owner;
    uint8 public decimals;

    mapping (address=>uint16) balances;
    mapping (address=>mapping (address=>uint16)) allowances;

    function TicketERC20() {
        name = "ToKen2020";
        symbol = "TC2020"; 
        totalSupply = 100;
        owner = msg.sender;
        balances[msg.sender] = totalSupply;
        decimals = 0;
    }
    
    function totalSupply() public view returns(uint16 totalSupply) {
        return totalSupply;
    }

    function balanceOf(address _tokenOwner) public view returns(uint16 balance) {
        require(_tokenOwner != address(0));
        return balances[_tokenOwner];
    }

    function allowance(address _tokenOwner, address _spender) public view returns(uint16 remainig) {
        return allowances[_tokenOwner][_spender];
    }

    function transfer(address _to, uint16 _tokens) public returns(bool) {
        balances[msg.sender] -= _tokens;
        balances[_to] += _tokens;
        Transfer(msg.sender, _to, _tokens);
        return true;
    }
    
    function approve(address _spender, uint16 _tokens) public returns (bool) {
        allowances[msg.sender][_spender] = _tokens;
        Approval(msg.sender, _spender, _tokens);
        return true;
    }
    
    modifier verificaSaldo(address _from, uint _tokens) {
        require (_tokens <= allowances[_from][msg.sender]);
        _;
    }

    
    modifier tokenPositivo(uint _tokens) {
        require(_tokens > 0);
        _;
    }
    

    function transferFrom(address _from, address _to, uint16 _tokens) public verificaSaldo(_from, _tokens) tokenPositivo(_tokens) returns(bool) {
        balances[_from] -= _tokens;
        balances[_to] += _tokens;

        allowances[_from][msg.sender] -= _tokens;
        Transfer(msg.sender, _to, _tokens);
        return true;
    }

}

variaveis.sol

pragma solidity >= 0.4.0;

contract GuardaLoteria {
    int8 numero;
    bool numeroPar;
    bool numeroImpar;
    
    constructor(int256  _numero) public payable {
        set (_numero);
    }
    
    function set(int256 _numero) public {
        require (_numero == int8(_numero), "Valor não cabe na variável global");
        numero = int8(_numero);
        
        numeroPar = numero % 2 == 0;
        numeroImpar = !numeroPar;
        
    }
    
    function get() public view returns (int8 _numero, bool _ePar, bool _eImpar) {
        return (numero, numeroPar, numeroImpar);
    }
}