PHP Exercises: Find the difference between the largest integer and the smallest integer

Last update on May 30 2022 11:44:41 (UTC/GMT +8 hours)

PHP: Exercise-64 with Solution

Write a PHP program to find the difference between the largest integer and the smallest integer which are created by 8 numbers from 0 to 9. The number that can be rearranged shall start with 0 as in 00135668.

Input: The difference between the largest integer and the smallest integer.

Pictorial Presentation:

PHP: Find the difference between the largest integer and the smallest integer.

Sample Solution: -

PHP Code:

<?php
fscanf(STDIN, '%d', $n);
for ($i = 0; $i < $n; $i++) {
    fscanf(STDIN, '%s', $s);
    $s = str_split($s);
    rsort($s);
    $a = (int) implode('', $s);
    sort($s);
    $b = (int) implode('', $s);
    echo "Difference between the largest integer and the smallest integer:\n";
    echo $a - $b;
    echo PHP_EOL;
}
?>

Sample Input:
1
34568729

Sample Output:

Difference between the largest integer and the smallest integer:
75308643

Flowchart:

PHP Code Editor:

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Previous: Write a PHP program to replace a string "Python" with "PHP" and "Python" with " PHP" in a given string.
Next: Write a PHP program to compute the sum of first n given prime numbers.

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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