Reverse Number program in C sharp-Display number in reverse order

Reverse Number program in C sharp – Learn how to reverse a given input number using for , while, do-while loops, function and recursion.

For example if you have a number 597, then reverse of that number is 795.

Reverse of 597=795.

Reverse Number program  examples  in C sharp

Reverse Number program using while loop

using System;
class Program
    {
        static void Main(string[] args)
        {
            int number = 359;

            int revereNumber = 0;
            int remainder = 0;
            Console.WriteLine("Number before reverse = " + number);
            while(number > 0)
            {
                remainder = number % 10;
                number = number / 10;
                revereNumber = revereNumber * 10 + remainder;
            }
            Console.WriteLine("Number after reverse  = "+ revereNumber);
        }
    }

Output

Number before reverse = 359
Number after reverse = 953

Reverse Number program using for loop.

using System;
 class Program
    {
        static void Main(string[] args)
        {
            //initializing num by 359
            int number = 359;

            int revereNumber = 0;
            int remainder = 0;
            Console.WriteLine("Number before reverse = " + number);
     
            //reverse number logic
            for (remainder = 0; number > 0;number = number / 10)
            {
                remainder = number % 10;
                
                revereNumber = revereNumber * 10 + remainder;
            }
            Console.WriteLine("Number after reverse  = " + revereNumber);
        }
    }

Reverse Number program using do-while loop.

class Program
    {
        static void Main(string[] args)
        {
           //initializing num by 359
            int number = 359;

            int revereNumber = 0;
            int remainder = 0;
            Console.WriteLine("Number before reverse = " + number);

             //reverse number logic
            if (number > 0)          
            do 
            {
                remainder = number % 10;
                number = number / 10;
                revereNumber = revereNumber * 10 + remainder;
            }while(number > 0);

            Console.WriteLine("Number after reverse  = " + revereNumber);
        }
    }

Reverse Number program using function.

class Program
    {
        static void Main(string[] args)
        {
              //initializing num by 359
            int number = 359;
            int revereNumber = 0;

           
            Console.WriteLine("Number before reverse = " + number);

            Program p = new Program();

            revereNumber = p.reverse(number);
            
            Console.WriteLine("Number after reverse  = " + revereNumber);
        }

        //reverse function definition
        int reverse(int num)
        {
            int revereNumber = 0;
            int remainder = 0;

            while (num > 0)
            {
                remainder = num % 10;
                num = num / 10;
                revereNumber = revereNumber * 10 + remainder;
            }
            return revereNumber;
        }
    }

Reverse Number program using recursion.

Method -1

using System;
 class Program
    {
        static void Main(string[] args)
        {
             //initializing num by 359
            int number = 359;
            int len = number.ToString().Length;
            int revereNumber = 0;


            Console.WriteLine("Number before reverse = " + number);

            Program p = new Program();

            revereNumber = p.reverse(number, len);

            Console.WriteLine("Number after reverse  = " + revereNumber);
        }
       
        //reverse function definition
        int reverse(int num,int limit)
        {
            if (limit == 1)  
                return num;
            else
                return (num%10)*(int)Math.Pow(10,limit-1)+reverse(num / 10, --limit);  //recursive function.
        }
    }

Method 2

class Program
    {
        public int sum = 0, remainder;
        static void Main(string[] args)
        {
            int number = 359;
            
            int revereNumber = 0;


            Console.WriteLine("Number before reverse = " + number);

            Program p = new Program();

            revereNumber = p.reverse(number);

            Console.WriteLine("Number after reverse  = " + revereNumber);
        }
         
        //reverse function definition
        int reverse(int num)
        {
            if (num > 0)
            {
                remainder = num % 10;
                sum = sum * 10 + remainder;
                reverse(num / 10);
            }
            else
                return sum;

            return sum;
        }
    }