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  1. #1
    jmscarlet9 is offline Member
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    Feb 2012
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    Default Computing Factorials

    Hey everyone,
    I need help with my Intro to Programming classes. Here is the assignment:

    Given a positive number n, the factorial of that number, denoted n!, is equal to 1 2 ... (n-1) n. It can also be computed recursively: n! = n (n-1)!, for all n greater than or equal to zero.

    For example,

    3! = 3 2!
    = 3 2 1!
    = 3 2 1
    = 3 2
    = 6
    By convention, 0! is 1.

    Here's the code I have so far....I think I'm way off....

    Java Code:
    import java.util.Scanner;
    public class ComputeFact
    		A method to compute n factorial (n!) recursively
    		@param n a number >= 0
    		@return the value of n!
    	public static void main(String[]args)
    		Scanner in = new Scanner(;
    		System.out.print("Please enter an interger: ");
    		int n = in.nextInt();
    	public static int factorial(int n)
    		//your work here
    		while (n <= 1)
    			n = (n-1) * n;
    		return factorial(n);

  2. #2
    Norm's Avatar
    Norm is offline Moderator
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    Default Re: Computing Factorials

    What output does the program print?

    Try working out the logic and how to generate the factorial using a piece of paper before trying to write the code.

    Look at the condition in the while statement.
    Last edited by Norm; 03-19-2012 at 10:42 PM.
    If you don't understand my response, don't ignore it, ask a question.

  3. #3
    DarrylBurke's Avatar
    DarrylBurke is offline Forum Police
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    Madgaon, Goa, India
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    Default Re: Computing Factorials

    davie89, don't hijack another poster's thread -- get your own, they're free. Your post and the response have been moved to a new thread: Problem in while conditions

    If you're forever cleaning cobwebs, it's time to get rid of the spiders.

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