[ECP 1016] In-lab Question 3

#include<stdio.h>


int main(){


    int num,sum=0,r;

    do{
    printf("Enter a number: ");
    scanf("%d",&num);


    if (num<0)
    {
        printf ("PLease Enter a positive 5 digit number\n");
    }

    else
    {
        if (num>=10000 && num < 100000)
        {
            for(;num!=0;num=num/10)
            {
                r=num%10;
                sum=sum+r;
            }

        printf("Sum of digits of number:  %d\n",sum);
        break;
        }

        else
        {
            printf ("PLease Enter a 5 digit number\n");
        }

    }

    }while(1);
  return 0;
}