JavaScript Program to Check Harshad Number

Posted in JavaScript Tutorial

Updated on Jan 11, 2024

By Mari Selvan

👁️ 92 - Views

⏳ 4 mins

💬 1 Comment

JavaScript Program to Check Harshad Number

Photo Credit to CodeToFun

🙋 Introduction

In the realm of programming, a Harshad number (or Niven number) is a positive integer that is divisible by the sum of its digits. Checking for Harshad numbers involves finding the sum of the digits and determining if the original number is divisible by this sum.

In this tutorial, we will explore a JavaScript program designed to check whether a given number is a Harshad number.

📄 Example

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

isHarshadNumber.js

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// Function to check if a number is a Harshad number
function isHarshadNumber(number) {
  let originalNumber = number;
  let sumOfDigits = 0;

  // Calculate the sum of digits
  while (number > 0) {
    sumOfDigits += number % 10;
    number = Math.floor(number / 10);
  }

  // If the original number is divisible by the sum of digits, it is a Harshad number
  return originalNumber % sumOfDigits === 0;
}

// Driver program
// Replace this value with the number you want to check
const number = 18;

// Call the function to check if the number is a Harshad number
if (isHarshadNumber(number)) {
  console.log(`${number} is a Harshad number.`);
} else {
  console.log(`${number} is not a Harshad number.`);
}

💻 Testing the Program

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

Output

18 is a Harshad number.

🧠 How the Program Works

The program defines a function isHarshadNumber that takes a number as input and returns true if the number is a Harshad number, and false otherwise.
Inside the function, it calculates the sum of the digits by iterating through the digits of the number.
If the original number is divisible by the sum of digits, the function returns true, indicating a Harshad number.
Replace the value of number in the main program with the desired number you want to check.
The program calls the isHarshadNumber function and prints the result using console.log.

📏 Between the Given Range

Let's delve into the javascript code that checks for Harshad numbers in the specified range.

isHarshadNumber.js

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// Function to check if a number is a Harshad number
function isHarshadNumber(number) {
  // Convert the number to a string to iterate through its digits
  let numString = number.toString();
  let sum = 0;

  // Calculate the sum of digits
  for (let digit of numString) {
    sum += parseInt(digit);
  }

  // Check if the number is divisible by the sum of its digits
  return number % sum === 0;
}

// List of Harshad numbers in the range 1 to 20
let harshadNumbers = [];

// Check numbers in the range and add Harshad numbers to the list
for (let i = 1; i <= 20; i++) {
  if (isHarshadNumber(i)) {
    harshadNumbers.push(i);
  }
}

// Print the result
console.log("Harshad numbers in the range 1 to 20:");
console.log(harshadNumbers.join(" "));

💻 Testing the Program

Output

Harshad numbers in the range 1 to 20:
1 2 3 4 5 6 7 8 9 10 12 18 20

The provided program is configured to check and list Harshad numbers in the range from 1 to 20. You can run the script as is to see the Harshad numbers in that specific range.

🧠 How the Program Works

The program defines a function isHarshadNumber that checks if a given number is a Harshad number.
Inside the function, it converts the number to a string to iterate through its digits and calculates the sum of the digits.
The program then iterates through numbers from 1 to 20, checks if each number is a Harshad number using the defined function, and adds Harshad numbers to the list.
Finally, it prints the list of Harshad numbers.

🧐 Understanding the Concept of Harshad Number

Before delving into the code, let's understand the concept of Harshad numbers. A Harshad number is a positive integer that is divisible by the sum of its digits.