Random suit and card with arrays

**SilentNite17** · February 29th, 2012, 07:56 PM

Hello!

I am having some practice with arrays, and I am trying to make a program that picks a random suit and then picks a random card from that suit. Here is the code, I am not finished with it yet:

public class RandomSuitandCard {
 
	public static void main(String[] arg) {
 
		int[] Diamond; 
		int[] Heart;
		int[] Club;
		int[] Spade;
		int i;  //position in array
		int i2 = 0;  //number to be out in array
 
		Diamond = new int[12];
		Heart = new int[12];
		Club = new int[12];
		Spade = new int[12];
 
		for (i=0, i=12, i++) {
			i2++;
			Diamond[i]=i2; }
 
		for (i=0, i=12, i++) {
			i2++;
			Heart[i]=i2; }
 
		for (i=0, i=12, i++) {
			i2++;
			Club[i]=i2; 
			}	
 
		for (i=0, i=12, i++) {
			i2++;
			Spade[i]=i2; 
			}	
		}
		}

The for statements are as follows:

for (i=0, i=12, i++) {
			i2++;
			Diamond[i]=i2; }

But the i++ is underlined in red and it says:

Syntax error, insert "; ; ) Statement" to complete ForStatement

This doesn't make any sense! Please help!

**blackscholes** · February 29th, 2012, 08:27 PM

Try putting semicolons (; signs) instead of commas in the for parameters.

**pbrockway2** · February 29th, 2012, 08:31 PM

for (i=0, i=12, i++) {

for statements don't use commas like that. If you are unsure check out The for Statement in Oracle's Tutorial.

-----

It would be a very good idea to follow Java coding conventions and begin variables with a lowercase letter: diamond etc.

**SilentNite17** · February 29th, 2012, 11:32 PM

Oh thank you so much!!! It solved it! Thanks again.

**SilentNite17** · March 1st, 2012, 12:02 AM

Ok, new problem.

I made an array array to hold all the suits, so here is the updated code:

import java.util.Random;  //imports the class needed to pick a random slot from the arrays, I did not want to you use Math.random and make a switch here, that is an alternative
 
public class RandomSuitandCard {
 
	public static void main(String[] arg) {
 
		int[][] suits;
		int[] diamond; 
		int[] heart;
		int[] club;
		int[] spade;
		int i;  //position in array
		int i2 = 0;  //number to be out in array
		int randomSuit;  //random suit chosen
		int randomCard;  //random card from random suit chosen
		String output;
 
		Random random = new Random();
 
		suits = new int[3][44];
		diamond = new int[12];
		heart = new int[12];
		club = new int[12];
		spade = new int[12];
 
		suits[0] = diamond;
		suits[1] = heart;
		suits[3] = club;
		suits[4] = spade;
 
		for (i=0; i<=12; i++) {
			i2++;
			diamond[i]=i2; }
 
		for (i=0; i<=12; i++) {
			i2++;
			heart[i]=i2; }
 
		for (i=0; i<=12; i++) {
			i2++;
			club[i]=i2; 
			}	
 
		for (i=0; i<=12; i++) {
			i2++;
			spade[i]=i2; 
			}	
 
		randomSuit = (random.nextInt(3));
 
		switch (randomSuit) {
		case 0:
			suits = suits[0];
		}
		}
		}

So, at the end, at

randomSuit = (random.nextInt(3));
 
		switch (randomSuit) {
		case 0:
			suits = suits[0];

I am trying to get the random suit. The suits[0] is underlined in red and it says:

Type mismatch: cannot convert from int[] to int[][]

But if you look at the top, it obviously says that it is an array array:

int[][] suits;

Help?

**Mr.777** · March 1st, 2012, 05:46 AM

How would you assign a single array to double array?
Read the error message carefully and you'll hopefully get to know.

**SilentNite17** · March 1st, 2012, 09:46 AM

Ok, here's what I think.

If your telling me that I need to display it as a suits[][] (array array) than I have already tried that and it does nothing. If you mean that I am trying to assign an array into an array array, then shouldn't that be what it does? I mean, an array is a box that contains numbers. So, an array array is a box of boxes of numbers, or an array that holds arrays, right?

If you saying that I need to make the one of the suits arrays that are supposed to contain the cards into something different, than please explain.

**Mr.777** · March 1st, 2012, 10:28 AM

What i mean to say is, let's assume you have a two dimensional array,

int [][] array = new int[5][];

What does this mean?
And when you do,

array = array[0];

what do you mean by this?

Tell us, what do you want to do and why do you need to do this?

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