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PHP Exercises: Test whether AB and CD are orthogonal or not

PHP: Exercise-68 with Solution

There are four different points on a plane, P(xp,yp), Q(xq, yq), R(xr, yr) and S(xs, ys). Write a PHP program to test whether AB and CD are orthogonal or not.
xp,yp, xq, yq, xr, yr, xs and ys are -100 to 100 respectively and each value can be up to 5 digits after the decimal point It is given as a real number including the number of.

Sample Solution:

PHP Code:

<?php
// Define a constant for a small epsilon value for numerical comparisons
define('EPS', 1e-8);

// Read input values as floating-point numbers
$a = fscanf(STDIN, '%f %f %f %f %f %f %f %f');

// Initialize an array to store the slopes of the two lines
$line = array();

// Calculate the slope of the first line, handling vertical line case
$line[] = $a[1] - $a[3] === 0.0 ? INF : ($a[0] - $a[2]) / ($a[1] - $a[3]);

// Calculate the slope of the second line, handling vertical line case
$line[] = $a[5] - $a[7] === 0.0 ? INF : ($a[4] - $a[6]) / ($a[5] - $a[7]);

// Check if the lines are orthogonal (perpendicular)
if (max($line) === INF && min($line) === 0 || abs($line[0] * $line[1] + 1.0) < EPS) {
    echo 'Orthogonal';
} else {
    echo 'Not orthogonal';
}

// Output a new line
echo PHP_EOL;

?>

Sample Input:
3.5 4.5 2.5 -1.5 3.5 1.0 0.0 4.5

Sample Output:

Not orthogonal

Flowchart:

Flowchart: Test whether AB and CD are orthogonal or not.

PHP Code Editor:

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