Password 5 Attempts - C# Programming Exercise

This C# exercise involves creating a program that prompts the user for their username and password, both as strings. If the entered credentials do not match the correct ones ("username" and "password"), the user can retry up to a maximum of 5 attempts. After five failed attempts, the program will reject the user and display an appropriate message.

This C# programming exercise is excellent for practicing control structures like loops (while or for) and conditionals. It also introduces the implementation of basic security systems with an attempt limit, which is useful in real-world applications requiring user authentication. By completing this exercise, the programmer will strengthen essential skills such as data validation, string handling, and flow control in C#.

Exercise

Password 5 Attempts

Objective

Write a C# program that prompts the user for their username and password. Both should be strings. After 5 incorrect attempts, the user will be rejected.

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C# Exercise Example

Example Code Copied

using System;  // Import the System namespace to use basic classes like Console

class Program  // Define the main class of the program
{
    static void Main()  // The entry point of the program
    {
        string username;  // Declare a variable to store the username
        string password;  // Declare a variable to store the password
        int attempts = 0;  // Variable to count the number of incorrect attempts

        // Allow a maximum of 5 attempts
        while (attempts < 5)
        {
            // Ask the user for their username
            Console.Write("Enter your username: ");
            username = Console.ReadLine();  // Read the username input from the user

            // Ask the user for their password
            Console.Write("Enter your password: ");
            password = Console.ReadLine();  // Read the password input from the user

            // Check if the username and password are correct
            if (username == "username" && password == "password")  // If both are correct
            {
                Console.WriteLine("Welcome! You have successfully logged in.");  // Display a welcome message
                return;  // Exit the program successfully
            }
            else  // If the username or password is incorrect
            {
                attempts++;  // Increment the number of attempts
                Console.WriteLine("Invalid username or password. Attempts left: " + (5 - attempts));  // Display error message and remaining attempts
            }
        }

        // If the user reaches 5 incorrect attempts, display a rejection message
        Console.WriteLine("You have been rejected after 5 incorrect attempts.");
    }
}

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using System;  // Import the System namespace to use basic classes like Console

class Program  // Define the main class of the program
{
    static void Main()  // The entry point of the program
    {
        string username;  // Declare a variable to store the username
        string password;  // Declare a variable to store the password
        int attempts = 0;  // Variable to count the number of incorrect attempts

// Allow a maximum of 5 attempts
        while (attempts < 5)
        {
            // Ask the user for their username
            Console.Write("Enter your username: ");
            username = Console.ReadLine();  // Read the username input from the user

// Ask the user for their password
            Console.Write("Enter your password: ");
            password = Console.ReadLine();  // Read the password input from the user

// Check if the username and password are correct
            if (username == "username" && password == "password")  // If both are correct
            {
                Console.WriteLine("Welcome! You have successfully logged in.");  // Display a welcome message
                return;  // Exit the program successfully
            }
            else  // If the username or password is incorrect
            {
                attempts++;  // Increment the number of attempts
                Console.WriteLine("Invalid username or password. Attempts left: " + (5 - attempts));  // Display error message and remaining attempts
            }
        }

// If the user reaches 5 incorrect attempts, display a rejection message
        Console.WriteLine("You have been rejected after 5 incorrect attempts.");
    }
}

Password 5 Attempts - C# Programming Exercise

Category

Basic Data Types

Exercise