02_ValueTypes.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
contract ValueTypes{
    // 布尔值
    bool public _bool = true;
    // 布尔运算
    bool public _bool1 = !_bool; //取非
    bool public _bool2 = _bool && _bool1; //与
    bool public _bool3 = _bool || _bool1; //或
    bool public _bool4 = _bool == _bool1; //相等
    bool public _bool5 = _bool != _bool1; //不相等

    // 整数
    int public _int = -1;
    uint public _uint = 1;
    uint256 public _number = 20220330;
    // 整数运算
    uint256 public _number1 = _number + 1; // +，-，*，/
    uint256 public _number2 = 2**2; // 指数
    uint256 public _number3 = 7 % 2; // 取余数
    bool public _numberbool = _number2 > _number3; // 比大小


    // 地址
    address public _address = 0x7A58c0Be72BE218B41C608b7Fe7C5bB630736C71;
    address payable public _address1 = payable(_address); // payable address，可以转账、查余额
    // 地址类型的成员
    uint256 public balance = _address1.balance; // balance of address
    
    // 固定长度的字节数组
    bytes32 public _byte32 = "MiniSolidity"; // bytes32: 0x4d696e69536f6c69646974790000000000000000000000000000000000000000
    bytes1 public _byte = _byte32[0]; // bytes1: 0x4d

}