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Repeating Multiplication of a Number in C# Using a While Loop

This exercise demonstrates how to use a while loop in C# to repeatedly ask for user input and perform a calculation. The program prompts the user to enter a number "x" and calculates the result of 10 * x. The program will continue asking for numbers and calculating the result until the user enters 0.

The while loop is an essential control structure in programming that allows you to repeat a block of code as long as a specified condition is true. This exercise will help you understand how to use loops to repeat tasks, a common need in many real-world applications, such as data entry forms or calculation processes that need to be repeated until a specific condition is met.



Group

C# Flow Control Basics

Objective

The objective of this exercise is to write a C# program that asks the user for a number "x" and displays 10 * x. The program will repeat this process until the user enters 0.

Write a C# program to ask the user for a number "x" and display 10 * x. It must repeat until the user enters 0 (using "while").

Example C# Exercise

 Copy C# Code 
// First and Last Name: John Doe

using System;

namespace MultiplyByTen
{
    class Program
    {
        // Main method to start the program execution
        static void Main(string[] args)
        {
            // Declare a variable to store the user's input
            int x;

            // Start the while loop that will continue as long as x is not zero
            while (true)
            {
                // Ask the user to input a number
                Console.Write("Enter a number (0 to stop): ");
                x = Convert.ToInt32(Console.ReadLine()); // Read the user's input and convert it to an integer

                // If the user enters 0, break the loop
                if (x == 0)
                {
                    break; // Exit the loop if x is 0
                }

                // Calculate and display the result of 10 * x
                Console.WriteLine("10 * " + x + " = " + (10 * x));
            }

            // Message when the loop ends
            Console.WriteLine("You entered 0. Program is exiting.");
            
            // Wait for user input before closing the console window
            Console.ReadKey(); // Keeps the console open until a key is pressed
        }
    }
}

 Output

//Example 1 (user enters several numbers):
Enter a number (0 to stop): 5  
10 * 5 = 50  

Enter a number (0 to stop): 7  
10 * 7 = 70  

Enter a number (0 to stop): 12  
10 * 12 = 120  

Enter a number (0 to stop): 0  
You entered 0. Program is exiting.

//Example 2 (user enters zero first):
Enter a number (0 to stop): 0  
You entered 0. Program is exiting.

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