SUM OF ALL 3-DIGITS

//WAP TO INPUT A 3-DIGIT NO. AND CALCULATE SUM OF ALL DIGITS.

#include<stdio.h>

#include<conio.h>

void main()

{

      int num;

      int r,sum=0;

      clrscr();

      printf("\nEnter a 3-digit no.=");

      scanf("%d",&num);

      r=num%10;

      sum=sum+r;

      num=num/10;

      r=num%10;

      sum=sum+r;

      num=num/10;

      r=num%10;

      sum=sum+r;

      printf("\n\nThe sum of all digits of entered no.=%d",sum);

      getch();

}