Trabb Pardo–Knuth algorithm: Difference between revisions
→{{header|PHP}}: Added.
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f(1.18367):9.38002
f(0.470145):1.20527
</pre>
=={{header|PHP}}==
<syntaxhighlight lang="php">
<?php
// Trabb Pardo-Knuth algorithm
// Used "magic numbers" because of strict specification of the algorithm.
function f($n)
{
return sqrt(abs($n)) + 5 * $n * $n * $n;
}
$sArray = [];
echo "Enter 11 numbers.\n";
for ($i = 0; $i <= 10; $i++) {
echo $i + 1, " - Enter number: ";
array_push($sArray, (float)fgets(STDIN));
}
echo PHP_EOL;
// Reverse
$sArray = array_reverse($sArray);
// Results
foreach ($sArray as $s) {
$r = f($s);
echo "f(", $s, ") = ";
if ($r > 400)
echo "overflow\n";
else
echo $r, PHP_EOL;
}
?>
</syntaxhighlight>
{{out}}
<pre>
Enter 11 numbers.
1 - Enter number: -5
2 - Enter number: -3
3 - Enter number: -2
4 - Enter number: -1
5 - Enter number: 0
6 - Enter number: 1
7 - Enter number: 2
8 - Enter number: 3
9 - Enter number: 4
10 - Enter number: 5
11 - Enter number: 6
f(6) = overflow
f(5) = overflow
f(4) = 322
f(3) = 136.73205080757
f(2) = 41.414213562373
f(1) = 6
f(0) = 0
f(-1) = -4
f(-2) = -38.585786437627
f(-3) = -133.26794919243
f(-5) = -622.7639320225
</pre>
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