JavaScript Program to Check Disarium Number

Posted in JavaScript Tutorial

Updated on Jan 11, 2024

By Mari Selvan

👁️ 50 - Views

⏳ 4 mins

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JavaScript Program to Check Disarium Number

Photo Credit to CodeToFun

🙋 Introduction

In the realm of programming, exploring mathematical patterns is a fascinating endeavor. One such numeric pattern is the Disarium number.

A Disarium number is a number defined by the sum of its digits each raised to the power of its respective position.

In this tutorial, we'll delve into a JavaScript program designed to check whether a given number is a Disarium number.

📄 Example

Let's explore the JavaScript code that checks whether a given number is a Disarium number.

isDisarium.js

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// Function to count the number of digits in a given number
function countDigits(number) {
  return String(number).length;
}

// Function to check if a number is a Disarium number
function isDisarium(number) {
  const originalNumber = number;
  let digitCount = countDigits(number);
  let sum = 0;

  while (number !== 0) {
    const digit = number % 10;
    sum += Math.pow(digit, digitCount);
    digitCount--;
    number = Math.floor(number / 10);
  }

  return sum === originalNumber;
}

// Driver program
// Replace this value with your desired number
const inputNumber = 89;

// Check if the number is Disarium
if (isDisarium(inputNumber)) {
  console.log(`${inputNumber} is a Disarium number.`);
} else {
  console.log(`${inputNumber} is not a Disarium number.`);
}

💻 Testing the Program

To test the program with different numbers, replace the value of inputNumber in the code.

Output

89 is a Disarium number.

Run the script to check if the number is a Disarium number.

🧠 How the Program Works

The program defines a function countDigits to count the number of digits in a given number.
The isDisarium function checks if a number is a Disarium number by summing the digits each raised to the power of its position.
The driver program tests the isDisarium function with a sample number (replace it with your desired number).

📏 Between the Given Range

Let's explore the JavaScript code that checks for Disarium numbers in the specified range.

isDisariumNumber.js

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// Function to check if a number is a Disarium number
function isDisariumNumber(num) {
  const numStr = num.toString();
  let sum = 0;

  for (let i = 0; i < numStr.length; ++i) {
    sum += Math.pow(parseInt(numStr[i]), i + 1);
  }

  return sum === num;
}

// Function to find Disarium numbers in the range 1 to 100
function findDisariumNumbersInRange() {
  const disariumNumbers = [];

  for (let i = 1; i <= 100; ++i) {
    if (isDisariumNumber(i)) {
      disariumNumbers.push(i);
    }
  }

  return disariumNumbers;
}

// Driver program
const disariumNumbersInRange = findDisariumNumbersInRange();
console.log("Disarium numbers in the range 1 to 100:");
console.log(disariumNumbersInRange.join(" "));

💻 Testing the Program

Output

Disarium numbers in the range 1 to 100:
1 2 3 4 5 6 7 8 9 89

Run the script to see the Disarium numbers in the range from 1 to 100.

🧠 How the Program Works

The program defines a function isDisariumNumber that checks if a given number is a Disarium number based on the defined condition.
It also defines a function findDisariumNumbersInRange that iterates through numbers from 1 to 100 and identifies Disarium numbers.
The main section calls these functions and prints the Disarium numbers in the specified range.