Sum Of Digit in C language

itterative version :

#include<stdio.h>

int main()

{

    int num,temp,sum;

    scanf("%d",&num);

    printf("Sum of %d is ",num);

    sum=0;

    while(num>0)

    {

        temp=num%10;

        sum+=temp;

        num/=10;

    }

    printf("%d",sum);

    return 0;

}

or you can make it recursive

#include<stdio.h>

int sumofdigit(int num)

{

    if(num<10)return num;

    else return (num%10)+sumofdigit(num/10);

}

int main()

{

    int num;

    scanf("%d",&num);

    printf("Sum of %d is ",num);

    while(num>=10)

    {

        num=sumofdigit(num);

    }

    printf("%d",num);

    return 0;

}

that is all from me 

thank you