以太坊智能合约开发 Solidity学习

1.

pragma solidity >=0.4.22 <0.6.0;//版本号，头文件
contract BooleanTest
{
    bool _a;//默认返回false
    int num1=100;
    int num2=200;
    function getBool() public view returns (bool)
    {
        return _a;
    }
    function getBool2() public view returns (bool)
    {
        return !_a;//去反
    }
    function judge() public view returns (bool)
    {
        return num1==num2;
    }
    function judge2() public view returns (bool)
    {
        return num1!=num2;
    }
    // && ||
    function and() public view returns (bool)//与
    {
        return (num1==num2)&&true;
    }
    function or() public view returns (bool)//或
    {
        return (num1==num2)||true;
    }
    
}