如何在Java程序中基于用户输入继续循环

Question

I have a lottery program that will run bets and randomly generate numbers. When the user reaches $5000 in total wins, that user will have an option to cash out $5000 and use the remaining balance to continue the loop. The user will also be able to end the loop if choosing to not cash out. How do I continue a loop based on user input? If the user writes yes, the loop will continue, but I am not sure how to do that. Can someone please help? If the loop is supposed to continue, $5000 removed from the user's total win because of cashout, the remaining balance will be used to play.

I have tried putting the if statement for user input in multiple places in the main loop, but the user budget keeps increasing, it does not subtract $5000.

java.util.Scanner
while (budget > 0) {

                lottery = (int) (Math.random() * 100);
                guess = (int) (Math.random() * 100);

                budget -= 1;    // budget = budget-1;
                // Get digits from lottery
                int lotteryDigit1 = lottery / 10;
                int lotteryDigit2 = lottery % 10;

                // Get digits from guess
                int guessDigit1 = guess / 10;
                int guessDigit2 = guess % 10;

                System.out.println("The lottery number is " + lottery);
                System.out.println("The computer picked number is " + guess);

                // Check the guess
                if (guess == lottery) {
                    System.out.println("Exact match: you win $10,000");
                    totalWin += 1000;
                } else if (guessDigit2 == lotteryDigit1 && guessDigit1 == lotteryDigit2) {
                    System.out.println("Match all digits: you win $3,000");
                    totalWin += 300;
                } else if (guessDigit1 == lotteryDigit1 || guessDigit1 == lotteryDigit2 || guessDigit2 == lotteryDigit1
                        || guessDigit2 == lotteryDigit2) {

                    System.out.println("Match one digit: you win $1,000");
                    totalWin += 100;
                } else
                    System.out.println("Sorry, no match");

                budget += totalWin;
                totalWin=0;

                if (budget > initBudget)
                    if ((budget-initBudget) >= 5000) {

                        System.out.println("You have reached the goal of 5000, we can go home!");
                        System.out.println("Enter 1 if you would like to cash out and use remaining balance to play and 0 if you would like to stop");
                        int decison = input.nextInt();
                        if (decison==1){budget=budget-5000;
                        System.out.println("Budget After play " + budget);
                        continue;
                        }break;


                    } 

                System.out.println("Budget After play " + budget);

            }

So in my code, I have the loop

System.out.println("Enter 1 if you would like to cash out and use remaining balance to play and 0 if you would like to stop");
int decison = input.nextInt();
    if (decison==1){budget=budget-5000;
System.out.println("Budget After play " + budget);
continue;
}break;
} 

This loop should receive user input and then subtract 5000 from the total win and use the remaining budget to continue play.. but it is only increasing. Don't understand why it is increasing if I have -5000.

(if possible, please help me change the answer to a yes/no rather than input 1)

Answer 1

I assumed you are using java.util.Scanner . Here is the answer;

System.out.println("Enter yes if you would like to cash out and use remaining balance to play and no if you " +
                "would like to stop");
String decison = input.nextLine();
if ("yes".equals(decison))
{
    budget = budget - 5000;
    System.out.println("Budget After play " + budget);
    continue;
}
break; // break the statement.

Answer 2

Erçin Akçay explained how to change the input from an int to a String.

I took a look at your code and made a runnable main method using it, and it works as you would expect. Perhaps the fact that it needs to be 5k from the intial budget is confusing?

if ((budget - initBudget) >= 5000)

Here is the entire class I used to check your code if it is helpful:

import java.util.Scanner;

public class Test {
    private static int budget;
    private static int lottery;
    private static int guess;
    private static int totalWin;
    private static int initBudget = 4500;

    public static void main(String[] args) throws InterruptedException {
        Scanner input = new Scanner(System.in);
        budget = initBudget;

        while (budget > 0) {

            lottery = (int) (Math.random() * 100);
            guess = (int) (Math.random() * 100);

            budget -= 1;    // budget = budget-1;
            // Get digits from lottery
            int lotteryDigit1 = lottery / 10;
            int lotteryDigit2 = lottery % 10;

            // Get digits from guess
            int guessDigit1 = guess / 10;
            int guessDigit2 = guess % 10;

            System.out.println("The lottery number is " + lottery);
            System.out.println("The computer picked number is " + guess);

            // Check the guess
            if (guess == lottery) {
                System.out.println("Exact match: you win $10,000");
                totalWin += 1000;
            } else if (guessDigit2 == lotteryDigit1 && guessDigit1 == lotteryDigit2) {
                System.out.println("Match all digits: you win $3,000");
                totalWin += 300;
            } else if (guessDigit1 == lotteryDigit1 || guessDigit1 == lotteryDigit2 || guessDigit2 == lotteryDigit1
                    || guessDigit2 == lotteryDigit2) {

                System.out.println("Match one digit: you win $1,000");
                totalWin += 100;
            } else {
                System.out.println("Sorry, no match");
            }

            budget += totalWin;
            totalWin = 0;

            if (budget > initBudget) {
                if ((budget - initBudget) >= 5000) {

                    System.out.println("You have reached the goal of 5000, we can go home!");
                    System.out.println(
                            "Enter 1 if you would like to cash out and use remaining balance to play and 0 if you "
                                    + "would like to stop");
                    int decison = input.nextInt();
                    if (decison == 1) {
                        budget = budget - 5000;
                        System.out.println("Budget After play " + budget);
                        continue;
                    }
                    break;


                }
            }

            System.out.println("Budget After play " + budget);

        }
    }
}

Answer 3

You can change your code like this:

System.out.println("Enter yes if you would like to cash out and use remaining balance to play and no if you would like to stop");
String decision = input.next();
if ("Yes".equalsIgnoreCase(decision)) { // Cashing Out
    budget = budget - 5000;
    System.out.println("Budget After play " + budget);
    continue;
}
break; // breaking the loop (if user enters anything other than yes)

Here I have used String (to store User's response as a word). If he enters Yes , yes or YES (ignoring the case, it will be considered that user wants to cash out) the loop will not break.