PHP Exercises: Calculate the mod of two given integers without using any inbuilt modulus operator

Last update on May 26 2025 13:17:25 (UTC/GMT +8 hours)

40. Calculate Modulus Without %

Write a PHP program to calculate the mod of two given integers without using any inbuilt modulus operator.

Sample Solution:

PHP Code:

<?php
// Function to calculate the remainder without using the modulus operator
function without_mod($m, $n)
{
    // Calculate how many times $n divides into $m
    $divides = (int) ($m / $n);
    
    // Calculate the remainder without using the modulus operator
    return $m - $n * $divides;
}

// Example usage of the function with inputs (13, 2)
echo without_mod(13, 2) . "\n";

// Example usage of the function with inputs (81, 3)
echo without_mod(81, 3) . "\n";

?>

Explanation:

Define a Function to Calculate Remainder Without Using the Modulus Operator:

function without_mod($m, $n) defines a function that takes two integers, $m and $n, and calculates the remainder of $m divided by $n without using %.

Calculate Division Result:

(int) ($m / $n) calculates how many times $n divides into $m and stores it in $divides.

Calculate Remainder:

$m - $n * $divides returns the remainder by subtracting the product of $n and $divides from $m.

Test the Function:

echo without_mod(13, 2) prints the remainder of 13 / 2, which is 1.
echo without_mod(81, 3) prints the remainder of 81 / 3, which is 0.

Output:

1                                                           
0

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to compute the remainder of two integers using iterative subtraction.
Write a PHP script to calculate modulus by leveraging floating-point division and floor functions.
Write a PHP function to perform modulus calculation without utilizing the % or fmod operators.
Write a PHP script to calculate modulus using bitwise operations where applicable.

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