C Program to Compute the Sum of Digits in a given Integer

This C Program computes the sum of digits in a given integer. This program m accepts integer. Then adds all the digits of a given integer, that becomes the sum of digits of integer.

Here is source code of the C program to compute the sum of digits in a given integer. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

1. /*

2.  * C program to accept an integer & find the sum of its digits

3.  */

4. #include <stdio.h>

6. void main()

7. {

8.     long num, temp, digit, sum = 0;

10.     printf("Enter the number \n");

11.     scanf("%ld", &num);

12.     temp = num;

13.     while (num > 0)

14.     {

15.         digit = num % 10;

16.         sum  = sum + digit;

17.         num /= 10;

18.     }

19.     printf("Given number = %ld\n", temp);

20.     printf("Sum of the digits %ld = %ld\n", temp, sum);

21. }

$ cc pgm81.c
$ a.out
Enter the number
300
Given number = 300
Sum of the digits 300 = 3
 
$ a.out
Enter the number
16789
Given number = 16789
Sum of the digits 16789 = 31