PHP Program to Check Odd Number

Posted in PHP Tutorial

Updated on Jan 11, 2024

By Mari Selvan

👁️ 74 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In the realm of programming, dealing with numbers is a fundamental task. One common requirement is checking whether a given number is odd or not.

An odd number is an integer that is not exactly divisible by 2 and leaves a remainder of 1 when divided by 2.

In this tutorial, we will explore a PHP program designed to check whether a given number is odd. The program involves using the modulo operator to determine if the number is not divisible by 2.

📄 Example

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

isOdd.php

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<?php
// Function to check if a number is odd
function isOdd($number)
{
  // If the remainder is 1, the number is odd
  return $number % 2 != 0;
}

// Driver program
// Replace this value with the number you want to check
$number = 15;

// Call the function to check if the number is odd
if (isOdd($number))
{
  echo "$number is an odd number.\n";
}
else
{
  echo "$number is not an odd number.\n";
}

?>

💻 Testing the Program

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

Output

15 is an odd number.

Run the script to check if the specified number is odd.

🧠 How the Program Works

The program defines a function isOdd that takes a number as input and returns true if the number is odd, and false otherwise.
Replace the value of $number in the main program with the desired number you want to check.
The program calls the isOdd function and prints the result using echo.

📏 Between the Given Range

Let's take a look at the php code that checks and displays odd numbers in the specified range.

checkOddNumbersInRange.php

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<?php
// Function to check and display odd numbers in a range
function checkOddNumbersInRange($start, $end)
{
  echo "Odd Numbers in the range $start to $end: \n";

  for ($i = $start;$i <= $end;$i++)
  {
    // Check if the current number is odd
    if ($i % 2 != 0)
    {
      echo "$i ";
    }
  }

  echo "\n";
}

// Set the range values
$startRange = 1;
$endRange = 10;

// Call the function to check and display odd numbers
checkOddNumbersInRange($startRange, $endRange);

?>

💻 Testing the Program

Output

Odd Numbers in the range 1 to 10:
1 3 5 7 9

The range for this program is fixed from 1 to 10. To test the program, simply run it.

🧠 How the Program Works

The program defines a function checkOddNumbersInRange that takes the start and end values of the range as input and echoes the odd numbers in that range.
Inside the function, it uses a for loop to iterate through each number in the specified range.
For each iteration, it checks if the current number is odd ($i % 2 != 0).
If the number is odd, it is echoed.

🧐 Understanding the Concept of Odd Number

Before delving into the code, let's understand the concept of odd numbers. An odd number is an integer that is not exactly divisible by 2. In other words, when an odd number is divided by 2, the remainder is 1.