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PHP for loop Exercises: Calculate and print the factorial of a number using a for loop

PHP for loop: Exercise-5 with Solution

Write a program to calculate and print the factorial of a number using a for loop. The factorial of a number is the product of all integers up to and including that number, so the factorial of 4 is 4*3*2*1= 24.

Pictorial Presentation:

PHP for loop Exercises: Calculate and print the factorial of a number using a for loop

Sample Solution:

PHP Code:

<?php
$n = 6;
$x = 1;
for($i=1;$i<=$n-1;$i++)
{
 $x*=($i+1); 
}
echo "The factorial of  $n = $x"."\n";
?>

Sample Output: 

The factorial of  6 = 720

Flowchart:

Flowchart: Calculate and print the factorial of a number using a for loop

PHP Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Create a script to construct the specific pattern, using a nested for loop.
Next: Write a program which will give you all of the potential combinations of a two-digit decimal combination, printed in a comma delimited format.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



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