Factorial Calculator
Factorial is not defined for negative numbers.";
} else {
$factorial = 1;
$steps = "";
for ($i = $number; $i >= 1; $i--) {
$factorial *= $i;
$steps .= $i;
if ($i > 1) {
$steps .= " × ";
}
}
echo "Factorial of $number
";
echo "$number! = $steps = $factorial
";
}
}
?>