Reverse of number using Recursion

This program reverse the number entered by the user and after that prints it on the screen. For instance, if a user enters 123 as input then 321 is printed as output.

C Program to reverse a number:

#include<stdio.h>

void main()

{

  int n,rem=0,rev=0;

  printf("Enter the number:");

  scanf("%d",&n");

  while(n>0)

  {

    rem=n%10;

    rev=rev*10+rem;

    n=n/10;

   }

 printf("Reverse of the number=%d",rev);

}

OUTPUT:

Enter the number:1234

Reverse of the number=4321

Using recursion:

#include<stdio.h>

void main()

{

  int n,rev;

  printf("Enter the number");

  scanf("%d",&n");

  rev=reverse(n);

  printf("Reverse of number=%d",rev);

}

int reverse(int num)

{

 int r=0,res=0;

 res=num%10;

 r=r*10+res;

 reverse(num/10);

 return(r);

 }

OUTPUT:

Enter the number:1234

Reverse of the number=4321