// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.4.16 <0.8.0;
contract TestModifire{
    uint num = 0;
    mapping(address => uint)  idmapping;
    mapping(uint => string)  namemapping;
    address public owner;
    address public owner1 = msg.sender;
    address public owner2 = address(this);
    constructor() public{
        owner = msg.sender;
    }
    modifier check(){
        require(idmapping[msg.sender] == 0, "已注册");
        _;
    }
    function register(string name)public check {
        address account = msg.sender;
        idmapping[account] = 1;
        num ++;
        idmapping[account] = num;
        namemapping[num] = name;
    }
    function getId(address _address) public view returns(uint){
        return idmapping[_address];
    }
    function getName(uint _id) public view returns(string){
        return namemapping[_id];
    }
    function change() public check{
        num ++;
    }
}