# Sum of digit in C

We can write the sum of digits program in c language with the help of loop and mathematical operation only. Let’s move forward to write the logic of the program to compute the sum of digits in a given integer.

#include <stdio.h> #include<conio.h> void main() { long num, temp, digit, sum = 0; clrscr(); printf("\n\t\t\t...Welcome To EduNews.Tech... "); printf("\n\nEnter the number : "); scanf("%ld", &num); temp = num; while (num > 0) { digit = num % 10; sum = sum + digit; num /= 10; } printf("Given number is = %ld\n", temp); printf("Sum of the digits %ld = %ld\n", temp, sum); printf("\n\n\n\t\t\tThankyou for Joining Us !"); printf("\n\t\t\t!Regards EduNews !"); getch(); }

**Program Output:**

### Program Explanation-

- Take an integer as an input and store it in the variable num.
- Initialize the variable sum to zero.
- Divide the input integer by 10 and obtain its remainder & quotient.
- Store the remainder in the variable digit.
- Increment the variable sum with a variable digit.
- Store the quotient into the variable num.
- Repeat the steps 3,4,5,6 with the new num.
- Do step 7 until the quotient becomes zero.
- Print the variable sum as output and exit.

I hope this post helps you to understand the Sum of digit program and its implementation in C programming language.

Keep coding 🙂