Sum and Product of all digits of a Number using C program

/* program to find sum and product of all digits of a number.*/
 
#include <stdio.h>
  
int main()
{
    int n;
    int dig, sum,pro;
     
    printf("\nEnter an integer number :");
    scanf("%d",&n);
  
    /*Calculating Sum and Product*/
    sum=0;
    pro=1;
     
    while(n>0)
    {
        dig=n%10; /*get digit*/
        sum+=dig;
        pro*=dig;
        n=n/10;
    }
     
    printf("\nSUM of all Digits is : %d",sum);
    printf("\nPRODUCT of all digits: %d",pro);
     
    return 0;
}

Using User Define Function

/* program to find sum and product of all digits of a number.*/
 
#include <stdio.h>
 
/*  function:   sumDigits
    to calculate sum of all digits.
*/
 
int sumDigits(int num)
{
    int sum=0,rem;
    while(num > 0)
    {
        rem=num%10;
        sum+=rem;
        num=num/10;
    }
 
    return sum;
}
 
/*  function:   proDigits
    to calculate product of all digits.
*/
 
int proDigits(int num)
{
    int pro=1,rem;
    while(num > 0)
    {
        rem=num%10;
        pro*=rem;
        num=num/10;
    }
 
    return pro;
 
}
int main()
{
    int n;
    printf("\nEnter an integer number :");
    scanf("%d",&n);
 
    printf("\nSUM of all Digits is : %d",sumDigits(n));
    printf("\nPRODUCT of all digits: %d",proDigits(n));
    return 0;
}

Output

Enter an integer number :1234
SUM of all Digits is : 10
PRODUCT of all digits: 24