Help with Random Numbers plus

[Cutter Jones]

Hi everyone.

I'm am new....I am stuck...please help

I'm trying to yes...do an assignment, but can't seem to wrap my head around it for some reason.

The assignment is:
-Create a lottery game application.
-Generate three random numbers from 0-9
-Allow the user to guess three numbers.
-Compare each of the users guesses to the three random numbers and
display a message that includes the users guesses and the randomly generated numbers and the amount of $$ won.
-The applications should accomadate repeating numbers.
(ie. the user guesses 1,2,3 and 1,1,1 comes up..he/she should only get credit for the one "1")

I've been going back and forth with different thoughts on how to proceed, and build on what I have.(if possible).

I'm coming here in hopes there is someone, who can guide me in the right direction.
This is where I am so far.


CODE:

import java.util.*;
import javax.swing.JOptionPane; 

public class RandomLottery2

{
public static void main (String[] args)
{


Random rand = new Random();
int randNum1=rand.nextInt(10);
int randNum2=rand.nextInt(10);
int randNum3=rand.nextInt(10);
System.out.println(randNum1);
System.out.println(randNum2);
System.out.println(randNum3);
	


String guessString;
int guess;



guessString = JOptionPane.showInputDialog(null,
"Please enter 3 digits from 0-9", "Lottery Numbers",
JOptionPane.QUESTION_MESSAGE);
guess = Integer.parseInt(guessString);



 if (guess == randNum1 && guess == randNum2 && guess == randNum3)
System.out.println("You matched one: you win $1,000,000.00"); 

else System.out.println("No Matches: Better luck next time!");

}
}

Thank you in advance

Cutter

[marc weber]

I would write this as a command line application first, without worrying about the GUI components. Once you have the logic working (your "model"), then you can connect it to a GUI (your "view").

As for the logical model, you already have the problem fairly well defined in English. I would suggest writing each of these "tasks" as a separate Java method. For example, you might write a method generateRandomNumbers(), or getUserInput(), or displayResults()...

I think you'll find it helpful breaking the assignment down into parts like this. Try that, and see how it goes.

[David Newton]

Please UseCodeTags. Unformatted code/config/etc. is difficult to read. You can edit your post to include them using the button or re-post the question with proper formatting.

[A Mann]

I agree with Marc - write a command line application first, and break the task down into manageable chunks (or 'methods').

For overall structure you could maybe try something like this.
(I'm a noob too when it comes to Java, so this is far from perfect, but hopefully helps a little)

import java.util.*;

public class RandomLottery2
{
	int[] usersNumbers; // an array to hold the users numbers
	int[] winningNumbers; // an array to hold the winning numbers
	int matches; // the number of matches the user gets
		
public static void main (String[] args)
{
// pick 3 random numbers
		pickWinningNumbers();  // separate method for this

// ask user for their 3 number
		getUsersNumbers();   // separate method for this

// count how many of their numbers match
		countMatches(); // separate method for this

// report the results
		showResults(); //; separate method for this
		
} // end main method		
		
private void pickWinningNumbers()
	{
		winningNumbers = new int[3];
			
			// use random number generator to find the winning numbers
			// and store them in this array
			
	} // end pickRandomNumbers method
	
private void getUsersNumbers()
	{
		usersNumbers = new int[3];
		
		// ask the user for their numbers and store them
		// in this array
		
	} // end getUsersNumbers method
	
private void countMatches()
	{
		// compare the winning numbers and those picked by the user
		// and work out how many matches they got
		
	} // end countMatches method
	
private void showResults()
	{
	 switch(matches)
		{
		case 0: // they got zero matches
			System.out.println("No Matches: Better luck next time!");
			break;
			
		case 1: // they got one match
		System.out.println("You matched one: you win $1,000,000.00");	
			break;
			
			etc
		}
	} // end showResults

} // end RandomLottery2 class

Obviously come back and ask again if you get stuck on any of those methods, or anything in this is unclear.

Good Luck

[Cutter Jones]

Thank you...

Unfortuanatly, we haven't learned "array" yet...I could probably firgure it out, but I don't think that would go over well with my teacher.

I guess my first problem is how do I compare a user input of one 3 digit number to the random 3 one digit numbers...?

There should be a logical way to do this....at least one that a noob like me can understand.

[Rene Larsen]

One solution could be, to match the input from a command line app one digit at a time - like this one:

Moved to our deleted forum

[Campbell Ritchie]

If anybody wishes to continue discussion about deleting text, please go to a duplicate of this thread here. The posts about deleting text will be removed from this copy of the thread.