PHP Exercises: Compute the digit number of sum of two given integers

Last update on May 30 2022 11:45:39 (UTC/GMT +8 hours)

PHP: Exercise-47 with Solution

Write a PHP program to compute the digit number of sum of two given integers.

Input:
Each test case consists of two non-negative integers x and y which are separated by a space in a line.
0 ≤ x, y ≤ 1,000,000

Pictorial Presentation:

PHP: Compute the digit number of sum of two given integers

Sample Solution: -

PHP Code:

<?php
 while(true) {
    $inputs = explode(' ', trim(fgets(STDIN))); 
    if (!is_array($inputs) || count($inputs) < 2) {
        exit;
    } 
    $a = $inputs[0];
    $b = $inputs[1]; 
    $d = numDigits($a + $b);
    echo("Digit number of sum of two given integers: ");
    echo $d . "\n";
} 
function numDigits($n) {
    return (int)(log10($n) + 1);
}
?>

Sample Output:

Digit number of sum of two given integers: 2

Flowchart:

PHP Code Editor:

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

Previous: Write a PHP program to find heights of the top three building in descending order from eight given buildings.
Next: Write a PHP program to check whether three given lengths (integers) of three sides form a right triangle. Print "Yes" if the given sides form a right triangle otherwise print "No".

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