factorial!

 source: Tino Duong, 2003

Description:

The factorial function is given by:



For example:

    3! = 3*2*1 = 6
    4! = 4*3*2*1 = 24

Factorials are useful because they give the number of ways in which n objects can be permuted. For example, , since the six possible permutations of are , , , , , .

Your job is to write a simple program what will compute N!.

Requirements:

• This program must prompt the user the value N
• Use this function prototype: double facIt(double N), that computes N! in an iterative manner
• User this function prototype: double facRec(double N), that computes N! in a recursive manner

    The output should be similar to this:

    Please enter the value (N) 
    6
    The iterative method gives the value of : 720
    The recursive method gives the value of : 720

Concepts:

• Recursion
• Functions
• Standard Input/Output 

Updated: August 29, 2005 12:17 AM