*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 : :**

- 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
of the function.**recursive call**

- 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 : :**

**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 : :**

**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 : :**

***************** 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.

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