By | 29.11.2016

# C Program to find Reverse of  Number

Write a C Program to find Reverse of Number using Recursion. Here’s simple Program to find Reverse of Number using Recursion in C Programming Language.

## Recursion : :

• Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.
• The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.
• Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

## Problem : :

The following C program using recursion reverses the digits of the number and displays it on the output of the terminal.

Example : : Reverse of 12345  is 54321.

Below is the source code for C Program to find Reverse of Number using Recursion which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

```/*  C Program to find Reverse of Number using Recursion  */

#include <stdio.h>
#include <math.h>

int rev(int, int);

int main()
{
int num, result;
int length = 0, temp;

printf("Enter an integer number to reverse: ");
scanf("%d", &num);
temp = num;
while (temp != 0)
{
length++;
temp = temp / 10;
}
result = rev(num, length);
printf("The reverse of %d is %d.\n", num, result);
return 0;
}

int rev(int num, int len)
{
if (len == 1)
{
return num;
}
else
{
return (((num % 10) * pow(10, len - 1)) + rev(num / 10, --len));
}
}```

### Output : :

```***************** OUTPUT ********************

***************** FIRST RUN *****************

Enter an integer number to reverse: 1234

The reverse of 1234 is 4321.

***************** SECOND RUN *****************

Enter an integer number to reverse: 42967

The reverse of 42967 is 76924.```

If you found any error or any queries related to the above program or any questions or reviews , you wanna to ask from us ,you may Contact Us through our contact Page or you can also comment below in the comment section.We will try our best to reach up to you in the short interval. 