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Thread: Random suit and card with arrays

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    Default Random suit and card with arrays

    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!


  2. #2
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    Default

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

  3. The Following User Says Thank You to blackscholes For This Useful Post:

    SilentNite17 (February 29th, 2012)

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    Default Re: Random suit and card with arrays

    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.

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    Default Re: Random suit and card with arrays

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

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    Default Re: Random suit and card with arrays

    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?
    Last edited by SilentNite17; March 1st, 2012 at 12:03 AM. Reason: Misspell

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    Default Re: Random suit and card with arrays

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

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    Default Re: Random suit and card with arrays

    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.

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    Default Re: Random suit and card with arrays

    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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