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php Programming Exercies

PHP Exercises: Compute and print sum of two given integers

PHP: Exercise-54 with Solution

Write a PHP program to compute and print sum of two given integers (more than or equal to zero). If given integers or the sum have more than 80 digits, print "overflow".

Pictorial Presentation:

PHP: Compute and print sum of two given integers.

Sample Solution: -

PHP Code:

<?php
fscanf(STDIN, '%d', $N);
for ($i = 0; $i < $N; $i++) {
    fscanf(STDIN, '%s', $a);
    fscanf(STDIN, '%s', $b);
    if (max(strlen($a), strlen($b)) > 80) {
        echo "overflow\n";
        continue;
    }
    $arr = array_fill(0, 81, 0);
    $a = sprintf('%081s', $a);
    $b = sprintf('%081s', $b);
    for ($j = 80; $j > 0; $j--) {
        $n = $arr[$j] + $a[$j] + $b[$j];
        if ($n >= 10) {
            $arr[$j] = substr($n, 1);
            $arr[$j - 1] += 1;
        } else {
            $arr[$j] = $n;
        }
    }
    $result = preg_replace('/^0+(\d+)$/', '$1', implode('', $arr));
    if (strlen($result) > 80) {
        echo "overflow\n";
    } else {
        echo $result, PHP_EOL;
    }
}
?>

Sample Output:

46
overflow
overflow
overflow
overflow
...
overflow
overflow
overflow

Flowchart:

Flowchart: Compute and print sum of two given integers.

PHP Code Editor:

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Previous: Write a PHP program to compute the radius and the central coordinate (x, y) of a circle which is constructed by three given points on the plane surface.
Next: Write a PHP program that accepts six numbers as input and sorts them in descending order.

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