PHP, calculating factorial recursively and iteratively
The factorial of a given positive integer is the product of all positive integers less than and equal to the given positive integer. For example, the factorial of 5!=1*2*3*4*5=120
The php code snippet below demonstrates two methods of calculating the factorial of a number, recursive and iterative.
<?php function recursiveFactorial($num) { if($num < 0) { return -1; } else if($num === 0) { return 1; } else { return $num * recursiveFactorial($num-1); } } function iterativeFactorial($num) { if ($num < 0) { return -1; } else if ($num === 0) { return 1; } $factorial = $num; $num = $num-1; while ($num > 1) { $factorial = $factorial * $num; $num = $num -1; } return $factorial; } echo "The factorial of 5 is:" . recursiveFactorial(5) . "\n"; echo "The factorial of 5 is:" . iterativeFactorial(5) . "\n";
Output:
The factorial of 5 is: 120
The factorial of 5 is: 120
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