C Program to find the product of digits of a number

/**************************************************
 Program to find the product of digits of a number
 * 
 * Enter a number: 456
 * 120
 **************************************************/

#include<stdio.h> // include stdio.h library

int main(void)
{       
    int num, rem, prod = 1;

    printf("Enter a number: ");
    scanf("%d", &num);

    while(num != 0)
    {
        rem = num % 10; // get the right-most digit
        prod *= rem; // calculate product of digits
        num /=  10;  // remove the right-most digit
    }

    printf("%d", prod);

    return 0; // return 0 to operating system
}

Enter a number: 234
24

Enter a number: 444
64