using System;

public class Program

{

    public static void Main()

    {

​

Console.WriteLine("Welcome to the log-in system"); 

​

Console.WriteLine("Please enter your username"); 

​

​

string username = Console.ReadLine(); 

​

if(username == "car") 

​

{Console.WriteLine("Please enter your password"); 

​

 string password = Console.ReadLine(); 

​

 if(password == "12345") 

​

 {Console.WriteLine(" welcome to the system");} 

​

 else 

​

 {Console.WriteLine("incorrect password or username");} 

​

} 

​

else 

​

 {Console.WriteLine("incorrect password or username");} 

    }

}