CODEWITHSUNDEEP
java
Twissted
Twissted

Reputation: 71

Take numbers from string array index, multiply them together?

So in this scenario I have an array with multiple cards within a deck. These cards in each index are ranked S1R1, S1R2, S1R3, S2R1, S2R2, S2R3. I need to be able to extract both numbers from each index position and multiply them together and eventually add them up.

For example, 
position 0 would be 1 * 1 = 1
position 1 would be 1 * 2 = 2
position 2 would be 1 * 3 = 3
etc. etc.

The code for this example changes based on user input so it's tough to give you the code to work with. 

public void createDeckofCards() {
    SizeOfDeck = NumberOfRanks * NumberOfSuits;

    Cards newCard = new Cards();

    newCard.setCards ( NumberOfRanks, NumberOfSuits );

    newDeck = new String [ SizeOfDeck ];


    int counter = 0;
    for (int whatSuit = 1; whatSuit <= NumberOfSuits; whatSuit++) {
        for (int rank = 1; rank <= NumberOfRanks; rank++) {
            newDeck[counter++] = newCard.createCard(rank, whatSuit);
        }
    } 
}

This is what calls upon method createCard() which creates each card based on how many cards the user inputs. So newDeck[] contains all these cards that I need to break into numbers and summarize eventually. (Making a histogram of 100,000 hands of cards)

Thank you for your time, and I appreciate any input

Upvotes: 0

Views: 99

Answers (2)

Aman Chhabra
Aman Chhabra

Reputation: 3894

You can use regex

^S([\\d]+)R([\\d]+)$

Code Snippet:

String s ="S3R4";
Pattern pattern = Pattern.compile("^S([\\d]+)R([\\d]+)$");
Matcher matcher = pattern.matcher(s);
if(matcher.find()){
System.out.println((Integer.parseInt(matcher.group(1))*Integer.parseInt(matcher.group(2))));
}

Output:

12

enter image description here

Upvotes: 1

Devon_C_Miller
Devon_C_Miller

Reputation: 16518

Make your card an object (Card perhaps) with properties of suit and rank. Give it methods to return:

  • a symbolic form (toString is a logical choice): return "S" + suit + "R" + rank;
  • a value form (getValue()): return suit * rank;

With that, you can create an array of Card instead of an array of String.

If you need the ability to convert the symbolic representations ("S1R7", "S3R9") to the physical object, create a Map<String, Card>. You can populate it with map.put(card.toString(), card);.

To look up a card you just need to Card card = map.get("S1R2"); Then the value is available as card.getValue()

Upvotes: 1

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