Question

我正在为一个项目工作，要求我使用while和for循环生成两个版本的猜谜游戏。分配的最后一部分是创建一个Driver类来调用GuessGame类中的两个游戏版本。出于某种原因，我的驱动程序在运行时不会执行while循环以允许用户输入他们的选择以选择要使用的游戏版本。有什么帮助吗？

GuessGame代码：

import java.util.Scanner;

public class GuessGame
{
    public static void example()
    {
        Scanner in = new Scanner(System.in);
        System.out.println("Give me a number:");
        int num = in.nextInt();
        System.out.println("You gave me " + num);
    }

    public static void roll1()
    {
        int guess = 1;
        int randomNumber = (int) (Math.random() * 10) + 1;
        Scanner scan = new Scanner(System.in);
        boolean win = true;

        System.out.println("I'm thinking of a number between 1 and 10.");

        while (win)
        {
            System.out.println("What is your guess?");
            guess = scan.nextInt();
            if (guess == randomNumber)
            {
                System.out.println("You guessed it!");
                break;
            }
            else if (guess > randomNumber)
            {
                System.out.println("Smaller!");
            }
            else if (guess < randomNumber)
            {
                System.out.println("Bigger!");
            }
        }
    }

    public static void roll2(int num)
    {
        int guess = 0;
        int randomNum = (int) (Math.random() * 20) + 5;
        Scanner scan = new Scanner(System.in);
        boolean win = true;

        System.out.println("I'm thinking of a number between 5 and 25");

        for (int guessNum = 0; guessNum < num; guessNum++)
        {
            System.out.println("What is your guess?");
            guess = scan.nextInt();
            if (guess == randomNum)
            {
                System.out.println("You guessed it!");
                break;
            }
            else if (guess > randomNum)
            {
                System.out.println("Smaller!");
            }
            else if (guess < randomNum)
            {
                System.out.println("Bigger!");
            }
        }
    }
}

驱动程序代码：

import java.util.Scanner;

public class Driver
{
    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);

        GuessGame game = new GuessGame();

        int choice = 1;

        System.out.println("Guessing Game");
        System.out.println("-------------");

        while (choice != 1)
        {
            System.out.println("1. Version 1");
            System.out.println("2. Version 2");
            System.out.println("3. Quit");

            System.out.println("\nPlease enter your choice > ");
            choice = in.nextInt();
            System.out.println();

            switch (choice)
            {
                case 1:
                    System.out.println("Version 1:");
                    game.roll1();
                    break;
                case 2:
                    System.out.println("Version 2:");
                    game.roll2(5);
                    break;
                case 3:
                    System.out.println("Thanks for playing.");
                    break;
                default:
                    System.out.println("Invalid choice.");
            }
        }
    }
}

很抱歉格式化问题，第一次使用此网站。

Answer 1

你的状况永远不会成真;

您将choice声明为

int choice = 1;

然后你说：

while (choice != 1)
{
   //stuff
}

因为choice被声明为= 1，所以循环永远不会自行完成。另一种方法是宣布选择如下

int choice = -1;

另一种方法是使用do while构造。

为什么我的驱动程序不会执行while循环？

1 个答案: