Sum of Digits

Sum of digits program in C

#include<stdio.h> 
int main()
{ 

    int a,b,sum=0;

    printf("Enter Number:");

    scanf("%d",&a); 

    while(a>0) 

    { 

        b=a%10; 

        sum=sum+b; 

        a=a/10; 

    } 

    printf("Sum is %d",sum);
    return 0; 

} 

Output:

Enter Number:123                                                                                                      

Sum is 6