PHP Program to Check Disarium Number

Posted in PHP Tutorial

Updated on Jan 11, 2024

By Mari Selvan

👁️ 19 - Views

⏳ 4 mins

💬 1 Comment

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 PHP program designed to check whether a given number is a Disarium number.

📄 Example

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

isDisarium.php

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<?php
// Function to count the number of digits in a given number
function countDigits($number)
{
  $count = 0;
  while ($number != 0)
  {
    $count++;
    $number = (int)($number / 10);
  }
  return $count;
}

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

  while ($number != 0)
  {
    $digit = $number % 10;
    $sum += pow($digit, $digitCount);
    $digitCount--;
    $number = (int)($number / 10);
  }

  return ($sum == $originalNumber);
}

// Replace this value with your desired number
$inputNumber = 89;

// Call the function to check if the number is Disarium
if (isDisarium($inputNumber))
{
  echo "$inputNumber is a Disarium number.\n";
}
else
{
  echo "$inputNumber is not a Disarium number.\n";
}

?>

💻 Testing the Program

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

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 main script tests the isDisarium function with a sample number (replace it with your desired number).

📏 Between the Given Range

Let's examine the PHP code that checks for Disarium numbers in the specified range.

isDisarium.php

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<?php
// Function to check if a number is Disarium
function isDisarium($number)
{
  $originalNumber = $number;
  $sum = 0;
  $length = strlen((string)$number);

  while ($number > 0)
  {
    $digit = $number % 10;
    $sum += pow($digit, $length);
    $number = (int)($number / 10);
    $length--;
  }

  return $sum === $originalNumber;
}

// Find Disarium numbers in the range 1 to 100
$disariumNumbers = [];
for ($i = 1;$i <= 100;$i++)
{
  if (isDisarium($i))
  {
    $disariumNumbers[] = $i;
  }
}

// Output format
echo "Disarium numbers in the range 1 to 100: \n" . implode(' ', $disariumNumbers);

?>

💻 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 of 1 to 100.

🧠 How the Program Works

The program defines a function isDisarium that checks if a given number is a Disarium number.
Inside the function, it calculates the sum of each digit raised to the power of its respective position.
The program then iterates through numbers from 1 to 100, checking each for Disarium properties.
Disarium numbers found are stored in an array, and the result is printed in the desired output format.