6) Write a C program that finds sum of digits of a number using Recursive function.

 source code name: RECSUM.C

#include<stdio.h>

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

int  main()
{
int n,s;
//clrscr();
printf(" enter any no: \n");
scanf("%d",&n);
s=sumrec(n);
printf(" sum of digits: %d ",s);
//getch();

return 0;
} 

output:

enter any no: 12345

sum of digits: 15

enter any no: 22222

sum of digits:10

enter any no: 12211

sum of digits:7