#include <stdio.h>
#include <math.h>
int rev(int num, int len)
{
    if (len == 1)
    {
        return num;
    }
    else
    {
        return (((num % 10)*pow(10,len-1))+rev(num/10,--len));
    }
}
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;
}