Question

my function doesn't return the value

Asked by: abel84

Hi, I made a function and it doesn't return the value it suppose to return.

      public String CardDefine(String card, int symbol, int shuffle)
      {
            String cardvalue="?",
                     design="?";

            switch(symbol)
            {
                  case 0:
                  design = "hearts";                        
                  break;
                  case 1:
                  design = "club";
                  break;
                  case 2:
                  design = "diamond";
                  break;
                  case 3:
                  design = "spades";
                  break;
            }

            switch(shuffle)
            {
                  case 0:
                  cardvalue = "2";
                  break;
                  case 1:
                  cardvalue = "3";
                  break;
                  case 2:
                  cardvalue = "4";
                  break;
                  case 3:
                  cardvalue = "5";
                  break;
                  case 4:
                  cardvalue = "6";
                  break;
                  case 5:
                  cardvalue = "7";
                  break;
                  case 6:
                  cardvalue = "8";
                  break;
                  case 7:
                  cardvalue = "9";
                  break;
                  case 8:
                  cardvalue = "10";
                  break;
                  case 9:
                  cardvalue = "j";
                  break;
                  case 10:
                  cardvalue = "queen";
                  break;
                  case 11:
                  cardvalue = "king";
                  break;
                  case 12:
                  cardvalue = "ace";
                  break;
            }
            
            card = cardvalue+"-"+design+".JPG";
            return (card);
      }

Lets say I call CardDefine(card, 2, 3);
of course 2 and 3 will be random numbers, but this is just an example.
Anyways, when I call the function CardDefine and then afterwards I do a system.out.printf and a put the string "card" to be displayed....it doesn't display the value for card.
this is the other function:
      public void CreateDeck()
      {
            String card="deck.JPG";
            
            for(int quatro=0;quatro<3;quatro++)
            {
                  for(int todo=0; todo<12; todo++)
                  {
                        CardDefine(card, quatro, todo);
                        cards[quatro][todo]=card;
                        System.out.printf("%s\n",cards[quatro][todo]);
                  }
                  
            }
      }
as you can se the System.out is just for testing purposes.
why when I compile it and then run it I get the same results? I get a display as "deck.JPG"

Thanks.

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Asked On
2005-05-31 at 16:55:39ID21442572
Tags

cardvalue

,

quatro

Topic

Java Programming Language

Participating Experts
3
Points
75
Comments
3

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Answers

 

by: objectsPosted on 2005-05-31 at 17:07:03ID: 14117901

>       CardDefine(card, quatro, todo);

you don't do anything with the return value

should be:

cards[quatro][todo] = CardDefine(card, quatro, todo);

 

by: IsisagatePosted on 2005-05-31 at 17:44:13ID: 14118027

There are a couple of things wrong with this code.

First, you are passing in card.
> public String CardDefine(String card, int symbol, int shuffle)

it really isn't getting used.  You could remove that parameter and use "objects" above post. that would do the job.

This is a pass by value but you loose the scope of the card variable when it returns. which explains why it returns deck.JPG.

You could altranately change in CardDefine() line:
> card = cardvalue+"-"+design+".JPG";

to

card = new String(cardvalue+"-"+design+".JPG");

good luck.

 

by: day7Posted on 2005-05-31 at 21:25:22ID: 14118828

try this, it should be self-explanatory as to what was wrong if you compare it to your code:

class CardTest{
    public String CardDefine(int symbol, int shuffle){ //only 2 parameters needed here

        String cardvalue="?", design="?";

        switch(symbol){
            case 0:
            design = "hearts";                    
            break;
            case 1:
            design = "club";
            break;
            case 2:
            design = "diamond";
            break;
            case 3:
            design = "spades";
            break;
        }

        switch(shuffle){
            case 0:
            cardvalue = "2";
            break;
            case 1:
            cardvalue = "3";
            break;
            case 2:
            cardvalue = "4";
            break;
            case 3:
            cardvalue = "5";
            break;
            case 4:
            cardvalue = "6";
            break;
            case 5:
            cardvalue = "7";
            break;
            case 6:
            cardvalue = "8";
            break;
            case 7:
            cardvalue = "9";
            break;
            case 8:
            cardvalue = "10";
            break;
            case 9:
            cardvalue = "j";
            break;
            case 10:
            cardvalue = "queen";
            break;
            case 11:
            cardvalue = "king";
            break;
            case 12:
            cardvalue = "ace";
            break;
       }
         
       
       return cardvalue+"-"+design+".JPG";
    }
     
    public void CreateDeck(){
       
        for(int quatro=0;quatro<3;quatro++){
            for(int todo=0; todo<=12; todo++){
                System.out.println(CardDefine(quatro, todo));
            }                                                                    
        }
    }

    public static void main(String args[]){
        CardTest test = new CardTest();
        test.CreateDeck();
    }

}

20120131-EE-VQP-002

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