How to get Factorial of a number using Recursive Function
Factorial, in mathematics, the product of all positive integers less than or equal to a given positive integer and denoted by that integer and an exclamation point. Thus, factorial seven is written 7! meaning 1 × 2 × 3 × 4 × 5 × 6 × 7. Factorial zero is defined as equal to 1.
In programming, a recursive function is a function that calls itself when it’s executed. This allows the function to repeat itself multiple times, producing the result at the end of each replication.
Here is the Example
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>factorial-recursive-function</title> </head> <body> <h4>Factorial of a Given Number using Recursive function</h4> <hr /> <!--- PHP Code --> <?php if(isset($_POST['submit'])){ function fact($n){ if($n <= 1){ return 1; } else{ return $n * fact($n - 1); } } $n =$_POST['number']; // Input Number $f = fact($n); echo "Factorial of $n is $f"; } ?> <form method="post"> <p>Enter the Number </p> <input type="text" name="number" required> <input type="submit" name="submit"> </form> </body> </html> |
