C Program to find Reverse of a 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

 Enter an integer number to reverse:  1234 
The reverse of  1234  is  4321 .

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