Program to Calculate the Sum of Digits of a number

//Program to Calculate the Sum of Digits of a number

#include<stdio.h>
#include<conio.h>

void main()
{
      int  num, sum=0, temp; /* 'sum' is  used to store the sum of digits of a number and 'temp' to store the number for calculations*/

      int rem=0; // used to store the remainder of the number

      clrscr(); // for clearing the console screen

      printf("Enter the number : ");
      scanf("%d",&num);
      temp = num; //copies the value of 'number' in 'temp'

// logic for calculating the sum of digits of number

      while(temp != 0) // checking whether 'temp' is equal to 0 or not
      {
          rem=temp%10; // extracting the last digit by dividing it with 10

     sum=sum+rem; /* calculating the sum of digits of the number - sum is initialized with zero so that no garbage value is added */

     temp=temp/10; // dividing the number by 10 to break it in parts.

      } // end of while loop

      printf("The sum of the digits of a number %d = %d",number,sum); /* printing the sum of digits of number */

      getch(); // for holding the console screen
}