// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.4.16 <0.8.0;

contract AddressTest{
    address public account;
    // 没有初始化的地址 0x0000000000000000000000000000000000000000
    // 字值的长度为40个字节每个字节是4位总共是160位用uint160类型存储
    // 布署之后有一个地址，就是合约的地址：0x9dAf7c849c20Be671315E77CB689811bD5EDefe6
    // from是当前布署合约的帐户的地址 to是合约的地址
    // from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4 Copy value to clipboard
    // to	AddressTest.account() 0x9dAf7c849c20Be671315E77CB689811bD5EDefe6 Copy value to clipboard
    address accountAddress = 0x9dAf7c849c20Be671315E77CB689811bD5EDefe6;
    
    
    address accountAddress1 = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4;
    address accountAddress2 = 0x9dAf7c849c20Be671315E77CB689811bD5EDefe6;
    
    // 返回 900225028477343218854985817280721561044193767398
    function changeIt()public view returns(uint160){
        return uint160(accountAddress); 
    }
    //返回 0x9dAf7c849c20Be671315E77CB689811bD5EDefe6
    function changeIt2()public pure returns(address){
        return address(900225028477343218854985817280721561044193767398); 
    }
    //地址之前是可以进行判断的
    function check1()public view returns(bool){
        return accountAddress1 > accountAddress2;
    }
     //地址之前是可以进行判断的
    function check2()public view returns(bool){
        return accountAddress1 < accountAddress2;
    }
     //地址之前是可以进行判断的
    function check3()public view returns(bool){
        return accountAddress1 >= accountAddress2;
    }
     //地址之前是可以进行判断的
    function check4()public view returns(bool){
        return accountAddress1 <= accountAddress2;
    }
     //地址之前是可以进行判断的
    function check5()public view returns(bool){
        return accountAddress1 == accountAddress1;
    }
}