C PROGRAM TO CALCULATE SUM OF OF THE NUMBER

#include<stdio.h>
main()
{
    int sum,rem,no;
    printf("Enter a number: ");
    scanf("%d",&no);
    sum=0;
    rem=0;
    if(no==0)
    printf("%d",no);
    while(no!=0)
    {
        rem=no%10;
        sum=sum+rem;
        no=no/10;
    }
    printf("Sum is %d",sum);
}        

OUTPUT
Enter a number:1234
Sum is 10