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

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:

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

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

Why shouldn't I use mysql_* functions in PHP?

The MySQL extension:

  • Is not under active development
  • Is officially deprecated as of PHP 5.5 (released June 2013).
  • Has been removed entirely as of PHP 7.0 (released December 2015)
  • This means that as of 31 Dec 2018 it does not exist in any supported version of PHP. If you are using a version of PHP which supports it, you are using a version which doesn't get security problems fixed.
  • Lacks an OO interface
  • Doesn't support:
    • Non-blocking, asynchronous queries
    • Prepared statements or parameterized queries
    • Stored procedures
    • Multiple Statements
    • Transactions
    • The "new" password authentication method (on by default in MySQL 5.6; required in 5.7)
    • Any of the new functionality in MySQL 5.1 or later

Since it is deprecated, using it makes your code less future proof.

Lack of support for prepared statements is particularly important as they provide a clearer, less error-prone method of escaping and quoting external data than manually escaping it with a separate function call.

Ref : https://bit.ly/2BIIsF0