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Thread: Factorial of 1-20

  1. #1
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    Default Factorial of 1-20

    I have to display the factorial's of numbers 1 - 20. I believe my code should work, but i keep getting the error:


    FactorialTest.java:6: cannot find symbol
    symbol : method factorial(int)
    location: class FactorialTest
    System.out.println( factorial( x ) );;
    ^(pointing under the "f" in "factorial")

    Any help on what's causing my error, and how to fix it, would be greatly appreciated. Thank's in advance.


    public class Factorial
    {
    	public static long factorial(int n)
    	{
    		if(n<=1)
    			return 1;
    		else
    			return n*factorial(n-1);
    	}
    }

    public class FactorialTest
    {
    	public static void main(String[] args)
    	{		
    		for( int x=1; x<=20; x++)
    			System.out.println( factorial( x ) );;
    	}
    }


  2. #2
    Junior Member Kakashi's Avatar
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    Default Re: Factorial of 1-20

    Im just think about this and could be wrong but try putting the int x out of the for loop and use and int i in the for loop instead: like this
    int x;
    for(int i; i<20;i++)
    {
          System.out.println(factor(x));
    }
    That might work

  3. #3
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    Default Re: Factorial of 1-20

    The factorial method cannot be accessed from the FactorialTest class because the factorial method is inside of the Factorial class. There are two ways to fix this:
    1) Create a Factorial object and invoke the factorial(int) method on that (and send it x).
    2) Use the static approach, where you would say new Factorial().factorial(x); instead of just factorial(x);

    It is a scope issue that is occurring because you are accessing methods between differing classes.
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