使用while循环保持分数的问题（Java）

Question

我正在介绍 java 类，对于我的一项作业，我必须使用循环（for 或 while）来跟踪我自己和计算机之间的分数。

这是我教授的逐字说明：

编写一个执行此操作的程序：您（作为程序员）是经销商。 为自己选择一个随机数（0 - 100 之间）。要求用户输入一个随机数（0 - 100 之间），谁更接近 21，谁就赢得了比赛。

（第 2 部分）-循环（保持计数器）编写相同的程序并使其继续运行，以便它继续播放（发牌并说出谁获胜）直到用户输入 21，此时您打印出一些统计数据并说再见。例如，您的再见可能如下所示：

游戏轮数：5 经销商获胜：3 玩家获胜：2

5 比 2。

现在我已经编写了代码并玩了好几个小时，但无法让它在循环中工作。我试过while，do while，for。我在互联网上到处寻找类似的例子，但无论如何都无法在我的程序中使用循环。如果有人有任何建议，我一定会感谢您的反馈。

我的代码：

    import java.util.*;

class asd {


    public static void main(String[] args) {


        Scanner sc = new Scanner(System.in);
        System.out.println("Welcome Valued player, take your guess!");


        int min = 0;
        int max = 100;
        int input;
        int c = 21;
        int count = 0;
        int userscore = 0;
        int dealerscore = 0;
        int gamesplayed = 0;


        Random rand = new Random();


        int r = rand.nextInt(max - min) + min;
        input = sc.nextInt();
        System.out.println("computer's number:" + r);


        if (Math.abs(input - c) <= Math.abs(r - c)) {
            System.out.println("the winner is the user!" + input);
            dealerscore++;
            gamesplayed++;


        } else {
            System.out.println("the winner is the computer!" + r);
            userscore++;
            gamesplayed++;
        }
        if (input == c) {
            System.out.println("thank you for playing. you won.");

        }

        if (r == c) {
            System.out.println("Thank you for playing:" + userscore);
            System.out.println(userscore);


        }

        if (input == 0) {
            System.out.println("Number of hands played:" + gamesplayed);
            System.out.println("Dealer won:" + dealerscore);
            System.out.println("User won:" + userscore);
        }

        while (input != c && r != c)
            gamesplayed++;


    }


    // TODO code application logic here
}

一切正常，但我无法让循​​环在这里的任何地方工作。

Answer 1

您需要一个包含游戏逻辑的 while 循环。条件应该只检查input != c。

然后在循环内部，不断询问用户输入。另外，您在添加分数时混淆了userscore 和dealerscore。

最后，一旦你退出循环，你就可以打印分数/统计数据。

请阅读下面的cmets：

import java.util.*;

public class MyClass {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Welcome Valued player, take your guess!: ");

        int min = 0;
        int max = 100;
        int input;
        int c = 21;
        int count = 0;
        int userscore = 0;
        int dealerscore = 0;
        int gamesplayed = 0;

        Random rand = new Random();
        int r = rand.nextInt(max - min) + min;
        input = sc.nextInt();

        /*
        This loop runs the game until the user enters 21
        */
        while (input != c) {
            System.out.println("Computer's number:" + r);

            if (Math.abs(input - c) <= Math.abs(r - c)) {
                System.out.println("The winner is the user! " + input);
                userscore++; //You mixed up userscore and dealerscore
            } else {
                System.out.println("The winner is the computer! " + r);
                dealerscore++; //You mixed up userscore and dealerscore
            }

            /*
            User needs to keep entering guesses
            */
            System.out.println();
            System.out.println("Enter another guess: ");
            r = rand.nextInt(max - min) + min;
            input = sc.nextInt();
        }

        /*
        You don't need any conditions since the games have already ended
        But it should be outside and after the loop
        */
        System.out.println("Number of hands played:" + gamesplayed);
        System.out.println("Dealer won:" + dealerscore);
        System.out.println("User won:" + userscore);
    }
}

Answer 2

用

改变循环

      while (input != c && r != c){
          gamesplayed++;
          System.out.println("Games played: " + gamesplayed );
      }

你会看到它正在工作。我会更好地格式化代码以更轻松地调试它并始终使用方括号。

Answer 3

试试这个。说明见代码即可。

import java.util.Random;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.println("Welcome Valued player, take your guess!");
        System.out.println("");

        int min = 0;
        int max = 100;
        int input;
        int c = 21;
        int userscore = 0;
        int dealerscore = 0;
        int gamesplayed = 1;

        Random rand = new Random();

        while (true) { // so that the game will keep playing
            System.out.println("----------------- ROUND " + gamesplayed + " -----------------");
            int r = rand.nextInt(max - min) + min; // computer's choice

            while (true) { // so that it will keep asking the user in case the user enters an invalid input
                try {
                    System.out.print("Enter a random number! :");
                    input = Integer.parseInt(sc.nextLine());
                    break;
                } catch (Exception e) {
                    System.out.println("Invalid input!");
                }
            }

            System.out.println("The computer's random number is " + r);

            // checking for the rounds winner
            if (Math.abs(input - c) <= Math.abs(r - c)) {
                System.out.println("The winner is the user!");
                userscore++;
            } else {
                System.out.println("The winner is the computer!");
                dealerscore++;
            }

            if (input == c) { // checking for ending the game
                System.out.println("================ GAME STATS ================");
                System.out.println("Thank you for playing.");
                System.out.println("Number of hands played: " + gamesplayed);
                System.out.println("Dealer score: " + dealerscore);
                System.out.println("User score: " + userscore);
                System.out.println("You are " + userscore + " out of " + gamesplayed + "!");
                System.out.println("============================================");
                sc.close();
                break;
            }

            gamesplayed++; // increment games played

            System.out.println("--------------------------------------------");
        }

    }

}