Write a program find Factorial of a number

Here we are writing a program of print the factorial of a number, factorial means 1 to n multiply them where n is defined by the product of all the digits from 1 to n.

Important Points About Factorial:

1. Factorial is denoted by n!.
2. Factorial is calculated only for positive integers(9) not for nagative integers(-2).
3. Do you know Factorial of 0 is always 1.
4. The best and simle way to calculate the factorial of a number is by using a loop or recursive method.

Here we are calculating factorial of number using two method one is using while and second using for loop.

PHP Program to find factorial of number using while loop:

<?php
$num = 5;
$factorial = 1;
while($num>=1)
{
 $factorial = $factorial*$num;
 $num--;
}
echo "Factorial of $num is $factorial"; 
?>

PHP Program to find factorial of number using for loop:

<?php 
$num = 5; 
$factorial = 1;
for ($i=$num; $i>=1; $i--)
{
 $factorial = $factorial * $i;
}
echo "Factorial of $num is $factorial";
?>

PHP program to Print factorial of a number using HTML Form

<form method="post">
<input type="text" name="number" placeholder="Enter number" />
<input type="submit" value="Submit" />
</form>

<?php
if(isset($_POST['number']))
{
$num = $_POST['number'];
$factorial = 1;
for ($i=$num; $i>=1; $i--)
{
$factorial = $factorial * $i;
}
echo "Factorial of $num is $factorial";
}
?>

Keywords:
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