如何格式化这些int值以打印为金钱。 （老虎机程序）

Question

我正在上课。它应该是一台老虎机。您可以从用户那里下注，如果他们匹配数字，他们会得到奖励。我们必须使用所有整数，但所有数字都必须打印为10美元，如10.00美元。在第一个if语句是我试图格式化的地方，但出现了错误。请帮助，如果您发现任何其他问题，请指出。

import java.util.*;
public class SlotMachine {

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    int slot1, slot2, slot3;
     Random generator = new Random();
     int balance = 10;
     int bet;
     do {
         System.out.println("Enter your bet");
         bet = input.nextInt();
     } while (bet < 0 || bet > balance);
     while (bet != 0) {
         slot1 = generator.nextInt(10);
         slot2 = generator.nextInt(10);
         slot3 = generator.nextInt(10);
         slot1 = 3;
         slot2 = 3;
         slot3 = 3; 
         System.out.println("Your numbers are " + slot1 + " " + slot2 + " " + slot3);
         if ((slot1 == slot2 && slot1==slot3 && slot2 == slot3)&& slot1 >0)
         {
             int winnings = (slot1 + 1)*bet;
             System.out.printf("Your winnings are: %.2f"+ winnings);
             balance = balance - bet + winnings;
             System.out.printf("Your new balance is: %.2f "+ balance);

         }
         if (slot1 == slot2 || slot1 == slot3 || slot2 == slot3)
         {
             if(slot1 == slot2 || slot1 == slot3 && slot1 >0)
             {
                 int winnings = (slot1 * bet)/2;
                 System.out.println("Your winnings are " + winnings);
                 balance = balance - bet + winnings;
                 System.out.println("Your new balance is " + balance);
             }
             else if (slot2 == slot3)
             {
                 int winnings = (slot2 * bet)/2;
                 System.out.println("Your winnings are " + winnings);
                 balance = balance - bet + winnings;
                 System.out.println("Your new balance is " + balance);
             }


         }
         else
         {
            int winnings = 0;
            balance = balance - bet + winnings;
            System.out.println("Your balance is " + balance);
         }
        if (balance > 0)
        {
            System.out.println("Enter your bet");
            bet = input.nextInt();
        }
        else
        {
            bet = 0;
        }

     }
     int winnings = balance - bet;
     System.out.println(winnings);
     System.out.println(balance);
     }
}

Answer 1

首先，你不需要做

(slot1 == slot2 && slot1==slot3 && slot2 == slot3)

刚

(slot1 == slot2 && slot2 == slot3)

而且，如果您确定所涉及的所有数字都是整数，而且我们只需要在结尾显示.00，那么就这样做

System.out.println("Your new balance is: $"+ balance + ".00");

由于我们只是添加，我怀疑会有一个小部分

最后，如果您仍想使用printf，则需要将int转换为float

System.out.printf("Your winnings are: %.2f", (float)winnings);

请注意，在您的代码中，您使用的是+而不是

用于println或print。不在printf