PHP Math Exercises: Rounds the specified values with 1 decimal digit precision

Last update on May 30 2022 11:49:39 (UTC/GMT +8 hours)

PHP math: Exercise-2 with Solution

Write a PHP script which rounds the following values with 1 decimal digit precision.

Sample values :
1.65
1.65
-1.54

Pictorial Presentation:

$PHP Math Exercises: Rounds the specified values with 1 decimal digit precision$

Sample Solution:

PHP Code:

<?php
echo round( 1.65, 1, PHP_ROUND_HALF_UP)."\n";   //  1.7
echo round( 1.65, 1, PHP_ROUND_HALF_DOWN)."\n"; //  1.6
echo round(-1.54, 1, PHP_ROUND_HALF_EVEN)."\n"; // -1.5
?>

Sample Output:

1.7                                                         
1.6                                                         
-1.5

Flowchart :

$Flowchart: Rounds the specified values with 1 decimal digit precision$

PHP Code Editor:

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Previous: Write a PHP script to find the maximum and minimum marks from the specified set of arrays.
Next: Write a PHP script to generate random 11 characters string of letters and numbers.

What is the difficulty level of this exercise?

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC