/* Sum of digits use recursive function to calculate sum of digits of an integer*/

#include  <stdio.h>
#include  <conio.h>

int  sum(int  n)
{
    if(n==0)
        return  0 ;
    else
        return( n%10 + sum(n/10) ) ;
}

void main()
{
    int  n ;
    clrscr() ;
    printf("Enter the number: ") ;
    scanf("%d", &n) ;
    printf("Sum of digits of %d is %d", n, sum(n) ) ;
    getch() ;
}

/*
Output:

Enter the number: 246
Sum of digits of 246 is 12
*/