2.15 if语句的嵌套

#include <iostream>
using namespace std;

int main()
{
    const int USER = 202501,PSW = 123456;
    int user,psw;
    cout << "用户名：";
    cin >> user;
    cout << "密码：";
    cin >> psw;
    if(user == USER)
    {
        if(psw = PSW)
        {
            cout << "亲爱的小朋友，欢迎你！";
        }
        else
        {
            cout << "密码错误！" << endl;
        }
    }
    else
    {
        cout << "用户名错误！";
    }
}