C Program to Find Reverse of a Number using Recursion

C program to reverse a number using Recursion.

A function calls itself, is called a Recursion. During the recursion, all the intermediate recursive calls data will be stored in Stack data structure. The stack works with a principle of Last in First out.

#include<stdio.h>  
int main()
{
    int num,x;
    printf("Enter a number: ");
    scanf("%d",&num);
    x=rev(num);
    printf("Reverse of given number is: %d",x);
    return 0;
}
int rev(int num)
{
    static sum,r;
    if(num)
    {
        r=num%10;
        sum=sum*10+r;
        rev(num/10);
    }
    else
        return 0;
    return sum;
}

Flowchart for Reverse of a Number, the flowchart is not based on recursion, but you will get an idea about working logic to find reverse of a number.

Output for reverse of a number:

Enter a number: 4567
Reverse of given number is: 7654