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Display Numbers Between Two Values Using Different Loops in C#

This C# program demonstrates the use of three different types of loops to accomplish the same task. The user is prompted to enter two numbers, and the program will display the numbers between (and including) those two values. The numbers will be displayed three times using three different types of loops: for, while, and do-while. Each loop type will be explained, and its role in generating the sequence of numbers will be demonstrated.

The for loop will iterate from the first number to the last number, printing each value in the range.

The while loop will start from the first number and continue until it reaches the last number, printing each value as it goes.

The do-while loop will ensure that at least one number is printed, and it will continue printing numbers until it reaches the last value.

This program highlights the differences in how these loops are structured and how they can be used to achieve the same result.



Group

C# Flow Control Basics

Objective

Write a C# program that prompts the user for two numbers and displays the numbers between them (inclusive) three times using "for", "while", and "do while" loops.

Enter the first number: 6
Enter the last number: 12

6 7 8 9 10 11 12
6 7 8 9 10 11 12
6 7 8 9 10 11 12

Example C# Exercise

 Copy C# Code 
using System;

namespace DisplayNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            // Prompt the user to enter the first number
            Console.Write("Enter the first number: ");
            int firstNumber = int.Parse(Console.ReadLine()); // Read and store the first number

            // Prompt the user to enter the last number
            Console.Write("Enter the last number: ");
            int lastNumber = int.Parse(Console.ReadLine()); // Read and store the last number

            // Using "for" loop to display the numbers between the two values (inclusive)
            Console.WriteLine("Using 'for' loop:");
            for (int i = firstNumber; i <= lastNumber; i++) // Start at firstNumber and go until lastNumber (inclusive)
            {
                Console.Write(i + " "); // Print the current number followed by a space
            }
            Console.WriteLine(); // Move to the next line after the loop

            // Using "while" loop to display the numbers between the two values (inclusive)
            Console.WriteLine("Using 'while' loop:");
            int j = firstNumber;
            while (j <= lastNumber) // While j is less than or equal to lastNumber
            {
                Console.Write(j + " "); // Print the current number followed by a space
                j++; // Increment j to move to the next number
            }
            Console.WriteLine(); // Move to the next line after the loop

            // Using "do-while" loop to display the numbers between the two values (inclusive)
            Console.WriteLine("Using 'do-while' loop:");
            int k = firstNumber;
            do
            {
                Console.Write(k + " "); // Print the current number followed by a space
                k++; // Increment k to move to the next number
            } while (k <= lastNumber); // Continue looping as long as k is less than or equal to lastNumber
            Console.WriteLine(); // Move to the next line after the loop
        }
    }
}

 Output

Enter the first number: 6
Enter the last number: 12
Using 'for' loop:
6 7 8 9 10 11 12 
Using 'while' loop:
6 7 8 9 10 11 12 
Using 'do-while' loop:
6 7 8 9 10 11 12

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More C# Practice Exercises of C# Flow Control Basics

Explore our set of C# Practice Exercises! Specifically designed for beginners, these exercises will help you develop a solid understanding of the basics of C#. From variables and data types to control structures and simple functions, each exercise is crafted to challenge you incrementally as you build confidence in coding in C#.