sum of digits of a number. - using while loop

#include<stdio.h>
int main()

{
    int num,temp,re,sum=0;
    scanf("%d",&num);
    temp=num;

    while(temp!=0)
    {
        re=temp%10;
        sum=sum+re;
        temp=temp/10;
    }

    printf("sum of all digit = %d\n",sum);
    return 0;
}