Thread: need help with a loop for class...

Heres the program description the instructor gave us for class...

Program Description: Write a program that finds the factorial of a value entered by the user. To calculate 12! (12 factorial) for example the program should calculate the value of

1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 x 11 x 12.

The program should continue processing numbers until the user inputs a zero. Be sure not to process the terminal value (zero).

When you are finished submit the completed program to your instructor.

and here is the code ive got so far

import java.io.*;
import java.util.Scanner;
 
public class Prog162a
{
	public static void main(String args[])
	{
		System.out.println("Enter a Number [Zero to quit]");
		Scanner a = new Scanner(System.in);
		int z = 0;
		int b = 0;
		int aa = a.nextInt();
		while (aa<=aa * 12 +1)
		{
			b = aa*1;
			continue;
		}
			b = aa*2;
			continue;
 
 
 
 
		System.out.println("The value of " + aa +"! is" + b);	
	}
}

the think im having trouble with is getting the numbers to multiply differently each time and having the user cut it off in time. Could you help me out please