rpaskin

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

/// @title ServiceEscrow - Exemplo didático de escrow para prestação de serviços
/// @notice Contrato simples: buyer deposita; se aceitar no prazo, paga seller; se prazo expirar sem aceite, reembolsa buyer.
contract ServiceEscrow {
    enum State { Created, Funded, Completed, Refunded }

    address public buyer;                 // Contratante
    address payable public seller;        // Prestadora

rpaskin

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

contract Carro {

    address payable public dono_atual;
    uint256 public renavam;
    uint256 public valor;

rpaskin

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

contract ArmazenarAcoes {

    mapping (address => uint) acoes;
    address public proprietario;

    constructor() {

rpaskin

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

contract RedeSocial {

    string  public  perfil;
    address private dono;

    function guardar(string calldata _perfil, address _dono) public {

rpaskin

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

contract RedeSocial {

    string perfil;
    address dono;

    function guardar(string calldata _perfil, address _dono) public {

rpaskin

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

contract RedeSocial {

    string perfil;
    address dono;

    function guardar(string calldata _perfil, address _dono) public {

rpaskin

// SPDX-License-Identifier: MIT
// Compatible with OpenZeppelin Contracts ^5.0.0
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract RefriToken is ERC20, Ownable {
    constructor(address initialOwner)
        ERC20("RefriToken", "RTK")

rpaskin

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract RefriToken {
    // dono do contrato
    address public donoDoContrato = msg.sender;

    // unidades (ether, data/hora, etc.)
    // https://docs.soliditylang.org/en/latest/units-and-global-variables.html
    uint public precoBase = 0.001 ether;

rpaskin

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract RefriToken {
    // o que vamos guardar?
    address public dono;
    uint    public codigoDeBarras;
    string  public sabor;
    string  public marca;
    uint    public preco;

rpaskin

// SPDX-License-Identifier: MIT
// Compatible with OpenZeppelin Contracts ^5.0.0
pragma solidity ^0.8.20;

import "@openzeppelin/contracts@5.0.2/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts@5.0.2/token/ERC20/extensions/ERC20Permit.sol";

contract RefriToken is ERC20, ERC20Permit {
    constructor() ERC20("RefriToken", "RFT") ERC20Permit("RefriToken") {
        _mint(msg.sender, 12 * 10 ** decimals());