Program in C to add three digits entered by keyboard

Write a program in C to add three digits entered by keyboard

#include <stdio.h>

void main ()

{

            int no,r,res;

            clrscr ();

            printf ("Enter any value: ");

            scanf ("%d",&no);

            r=res=0;

            while (no>0)

            {

                        r=no%10;

                        no=no/10;

                        res=(res+r);

            }

            printf ("Sum is %d",res);

            getch ();

}