C Program to find Sum of Digits

Posted in C Tutorial

Updated on Oct 06, 2024

By Mari Selvan

👁️ 153 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In the realm of programming, manipulating and extracting information from numbers is a common task. One such operation is finding the sum of the digits of a given number. This involves breaking down the number into its individual digits and adding them together.

In this tutorial, we will explore a C program designed to find the sum of the digits of a given number.

📄 Example

Let's delve into the C code that accomplishes this task.

sumOfDigits.c

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#include <stdio.h>

// Function to find the sum of digits of a number
int sumOfDigits(int number) {
  int sum = 0, digit;

  // Iterate through each digit of the number
  while (number != 0) {
    // Extract the last digit
    digit = number % 10;
    // Add the digit to the sum
    sum += digit;
    // Remove the last digit from the number
    number /= 10;
  }

  return sum;
}

// Driver program
int main() {
  // Replace this value with the number you want to find the sum of digits for
  int number = 12345;

  // Call the function to find the sum of digits
  int result = sumOfDigits(number);

  // Print the result
  printf("The sum of digits of %d is: %d\n", number, result);

  return 0;
}

💻 Testing the Program

To test the program with different numbers, modify the value of number in the main program.

Output

The sum of digits of 12345 is: 15

Compile and run the program to find the sum of digits for the specified number.

🧠 How the Program Works

The program defines a function sumOfDigits that takes an integer number as input and returns the sum of its digits.
Inside the function, it uses a while loop to iterate through each digit of the number.
It extracts the last digit, adds it to the sum, and removes the last digit from the number.
Inside the main program, replace the value of number with the desired number you want to find the sum of digits for.
The program calls the sumOfDigits function and prints the result.

🧐 Understanding the Concept of Sum of Digits

Before delving into the code, let's understand the concept of finding the sum of digits. It involves breaking down a number into its individual digits and adding them together.