How do I print a random from a 2d array

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Java

String[][] table = new String[][] { {"Spade","Diamond","Heart","Club"}, {"Ace", "2","3","4","5","6","7","8","9","Jack","Queen","King",} };
      
    String LuckyCard;
     for (int r = 0; r < table.length; r++)
    {
        for (int c = 0; c < table[r].length; c++)
            {
            int cardLucky = (int)(Math.random()*13) + 1; // generating random card

int suitLucky = (int)(Math.random()*4) + 1; // generating random suit

        
LuckyCard = "Lucky Card is " + table[cardLucky][suitLucky];
                    System.out.println(LuckyCard);
                  break;
        }}
   for(int i = 0; i < table.length; i++) {
            for(int j = 0; j < table[i].length; j++) {
                System.out.print(table[i][j] + " ");
            }
        }

}

What I have tried:

I understand that this part of my code "LuckyCard = "Lucky Card is " + table[cardLucky][suitLucky];" isn't working because my array is a string and tha math.random is for integers. Is there another way to do this to pick a random card from the 2d array?

Posted 14-Dec-17 12:23pm

Member 13576973

Updated 14-Dec-17 16:18pm

PIEBALDconsult

v2

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User 7407470 · Answer 1 · 2017-12-14T14:36:00

Solution 1

In this case you should not use a 2d array, but just two arrays:

C#

String[] suits = {"Spades","Diamonds","Hearts","Clubs"};
String[] cards = {"Ace", "2","3","4","5","6","7","8","9","Jack","Queen","King"};

int cardLucky = (int)(Math.random() * 13);
int suitLucky = (int)(Math.random() * 4);

LuckyCard = "Lucky Card is " + cards[cardLucky] + " of " + suits[suitLucky] + ".";

Posted 14-Dec-17 14:36pm

User 7407470

Comments

Member 13576973 14-Dec-17 21:29pm

The teacher required us to use a 2d array

[no name] 14-Dec-17 22:18pm

In that case you could create a 2d cards[4][13] array that you fill with (do it in a loop):

String[][] table = new String[][] { { "Spade Ace", "Spade 2", ...}, { "Diamond Ace", "Diamond 2", ...}, { "Heart Ace", "Heart 2", ...}, { "Club Ace", "Club 2", ...}};

and select a card with:

LuckyCard = "Lucky Card is " + table[suitLucky][cardLucky];

But this just isn't the best way to do it...

Patrice T · Answer 2 · 2017-12-14T16:18:00

Learn to indent properly your code, it show its structure and it helps reading and understanding. It also helps spoting structures mistakes.

Java

  String[][] table = new String[][] { {"Spade","Diamond","Heart","Club"}, {"Ace", "2","3","4","5","6","7","8","9","Jack","Queen","King",} };
  
  String LuckyCard;
  for (int r = 0; r < table.length; r++)
  {
    for (int c = 0; c < table[r].length; c++)
    {
      int cardLucky = (int)(Math.random()*13) + 1; // generating random card
  
      int suitLucky = (int)(Math.random()*4) + 1; // generating random suit
  
  
      LuckyCard = "Lucky Card is " + table[cardLucky][suitLucky];
      System.out.println(LuckyCard);
      break;
    }
  }
  for(int i = 0; i < table.length; i++) {
    for(int j = 0; j < table[i].length; j++) {
      System.out.print(table[i][j] + " ");
    }
  }

}

Professional programmer's editors have this feature and others ones such as parenthesis matching and syntax highlighting.
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This code is non sense, you need to explain what you try to do.
table is not a 2d array of cards, it is a list of 2 lists, the first one is a list of suits and the second is a list of cards values.
So this:

Java

LuckyCard = "Lucky Card is " + table[cardLucky][suitLucky];

must be replaced by:

Java

LuckyCard = "Lucky Card is " + table[1][cardLucky] + table[0][suitLucky];

your code have many other problems, but we need to know what you try to do.