Write a recursive function to find sum of digits of any number input through keyboard.

main()
{
int s, n;
printf("\nEnter any number:");
scanf("%d",&n);
s =sum(n);
printf("\n Sum of digits = %d",s);
}      
sum(int n)
{ 
if(n<10)
return(n); else
return(n %10 + sum(n/10)) ;
}