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Thread: Stopping while loop if there are insufficient funds.

  1. #1
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    Default Stopping while loop if there are insufficient funds.

    So basically, when someone's bankroll gets to 0 or below 0, I want the program to end so they cannot play any longer. Here is my current code:

    import java.util.*;
    public class Craps {
    	public static void main(String[] args) {
    		Scanner scan = new Scanner(System.in);
    		System.out.println("Want to play Craps? Type yes or no.");
    		String answer = scan.next();
    		System.out.println("How much is your bankroll?");
    		double bankroll = scan.nextDouble();
    		while (answer.equalsIgnoreCase("yes")) {
    			System.out.println("What is your bet?");
    			double betAmount = scan.nextDouble();
    			if (checkWin(rollDice()) == true) {
    				bankroll = bankroll + betAmount;
    				System.out.println("Your current bankroll is $" + bankroll);
    			} else {
    				bankroll = bankroll - betAmount;
    				System.out.println("Your current bankroll is $" + bankroll);
    			}
    			if (bankroll <=0) {
    				answer = "no";
    			}
    			System.out.println("Play again? Type yes or no: ");
    			answer = scan.next();	
    		}
    	}
    	public static double newBank(double betAmount, double bankroll) {
    		double newBank = bankroll - betAmount;
    		System.out.println(newBank);
    		return newBank;
    	}
    	public static int rollDice() {
    		Random randomNum = new Random();
    		int x = randomNum.nextInt(6) + 1;
    		int y = randomNum.nextInt(6) + 1;
    		System.out.println("Dice Rolls: " + x + " and " + y);
    		int comeoutRoll = x + y;
    		System.out.println("Your dice add up to: " + comeoutRoll);
    		return comeoutRoll;
    	}
     
    	public static boolean checkWin(int comeoutRoll) {
    		int firstRoll = comeoutRoll;
    		if (firstRoll == 7 | firstRoll == 11) {
    			System.out.println("Woah, winner here.");
    			return true;
    		} if (firstRoll == 2 | firstRoll == 3 | firstRoll == 12) {
    			System.out.println("You lost!");
    			return false;
    		} 
    		while (true) {
    			int currentRoll = rollDice();
    			if (currentRoll == 7) {
    				System.out.println("You lost!");
    				return false;
    			}
    			if (currentRoll == firstRoll) {
    				System.out.println("They match! You win!");
    				return true;
    			}
    				System.out.println("NOT QUITE - Continue rolling...");
    		}
    	}
    }

    Help would be wonderful!


  2. #2
    Member GoodbyeWorld's Avatar
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    Default Re: Stopping while loop if there are insufficient funds.

    Ok, is the play again input thing only if they have a bankroll greater than 0 or is it something that allows them to play again after they've lost or something and start over?

    (If it's the latter, it should be in an outer while loop.)


    Assuming that the two go together and that it will end if they type nor or if they hit a bankroll of 0, then you can use && to make sure both conditions are met for it to keep looping.


    i.e.

    while (answer.equalsIgnoreCase("yes") && bankroll > 0)
    {
    .........


    }

    What confuses me is why, if you set answer equal to "no", you allow the user to change the value of answer with your input into the variable answer.
    JavaScript is NOT Java.

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

    taze (October 16th, 2013)

  4. #3
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    Default Re: Stopping while loop if there are insufficient funds.

    I looked and I don't need the initial yes/no answer, so I got rid of it.

    So the goal is to allow them to choose play again as long as they have a positive bankroll, however once their bankroll is less than 0 (i.e. in the negatives) it is no longer an option. I'm not sure where I can put the question to ask yes or no to playing again.

    So here is my current code:
    import java.util.*;
    public class Craps {
    	public static void main(String[] args) {
    		Scanner scan = new Scanner(System.in);
    		String answer = "yes";
    		System.out.println("How much is your bankroll?");
    		double bankroll = scan.nextDouble();
    		while (answer.equalsIgnoreCase("yes") && bankroll > 0) {
    			System.out.println("What is your bet?");
    			double betAmount = scan.nextDouble();
    			if (checkWin(rollDice()) == true) {
    				bankroll = bankroll + betAmount;
    				System.out.println("Your current bankroll is $" + bankroll);
    			} else {
    				bankroll = bankroll - betAmount;
    				System.out.println("Your current bankroll is $" + bankroll);
    			}
    			System.out.println("Play again? Type yes or no: ");
    			answer = scan.next();	
    		}      
    	}
    	public static double newBank(double betAmount, double bankroll) {
    		double newBank = bankroll - betAmount;
    		System.out.println(newBank);
    		return newBank;
    	}
    	public static int rollDice() {
    		Random randomNum = new Random();
    		int x = randomNum.nextInt(6) + 1;
    		int y = randomNum.nextInt(6) + 1;
    		System.out.println("Dice Rolls: " + x + " and " + y);
    		int comeoutRoll = x + y;
    		System.out.println("Your dice add up to: " + comeoutRoll);
    		return comeoutRoll;
    	}
     
    	public static boolean checkWin(int comeoutRoll) {
    		int firstRoll = comeoutRoll;
    		if (firstRoll == 7 | firstRoll == 11) {
    			System.out.println("Woah, winner here.");
    			return true;
    		} if (firstRoll == 2 | firstRoll == 3 | firstRoll == 12) {
    			System.out.println("You lost!");
    			return false;
    		} 
    		while (true) {
    			int currentRoll = rollDice();
    			if (currentRoll == 7) {
    				System.out.println("You lost!");
    				return false;
    			}
    			if (currentRoll == firstRoll) {
    				System.out.println("They match! You win!");
    				return true;
    			}
    				System.out.println("NOT QUITE - Continue rolling...");
    		}
    	}
    }

    I'm just not sure what part of the loop (or if I need another loop) that I should put the question that will allow them to redefine the variable answer and thus either end the game or continue on.

  5. #4
    Member GoodbyeWorld's Avatar
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    Default Re: Stopping while loop if there are insufficient funds.

    If they type "no", does the game end?

    It seems that you're doing it right with the code above.


    I think a simple if statement should ensure it doesn't ask them to play again if their bankroll is 0.

    if (bankroll > 0)
    {
    System.out.println("Play again? Type yes or no: ");
    answer = scan.next();
    }


    and keep the question where you had it, just add the if statement.

    If the bankroll is 0, it will not go into the if and hence won't ask to play again and will exit the while loop (and, since I don't see anything after the while loop, the program will end.)
    JavaScript is NOT Java.

  6. The Following User Says Thank You to GoodbyeWorld For This Useful Post:

    taze (October 16th, 2013)

  7. #5
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    Default Re: Stopping while loop if there are insufficient funds.

    Well that worked and I'm a little embarrassed I missed that! Thanks so much for the help.

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