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:

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:

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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PHP: Tips of the Day
Returns all elements in an array except for the first one
Example:
<?php function tips_tail($items) { return count($items) > 1 ? array_slice($items, 1) : $items; } print_r(tips_tail([1, 5, 7])); ?>
Output:
Array ( [0] => 5 [1] => 7 )
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