JAVA 猜数游戏使用方法：重玩方法不正常

Question

我是 JAVA 的新手，我编写了一个程序来计算用户在 1 到 100 之间选择的数字。

程序运行应该通过猜测下限和上限的中点以及用户响应的更高或更低，直到猜出正确的数字。但是，当程序询问您是否想再玩一次？ (y/n): 它没有正确输入字符。无论输入什么字符，程序都会再次运行，并且不会在输入 "n" 时终止。

任何帮助将不胜感激。谢谢！

import java.util.Scanner;

public class NumberGuesser 
{

    public static void main(String[] args)
    {
        do
        {
            playOneGame();
        }
        while(shouldPlayAgain());
    }

    //method for complete guessing number game between 1 and 100
    public static void playOneGame()
    {
        //initial lower range to 0 and upper range to 100
        int lowerBound = 0;
        int upperBound = 100;

        //Display message for user to guess a nummber
        System.out.println("Guess a number between 1 and 100.");

        //declare variables for program's number guess and user's response if number is higher or lower
        int guess;
        char userResponse;

        do //do while loop to make number guesses until correct number is found
        {
            //call method to guess midpoint number
            guess = Midpoint(lowerBound,upperBound);

            // call method to get response from user if number is high low or correct
            userResponse = getUserResponseToGuess(guess);

            //decision structure if-else statements to set new lower/upper bounds after every iteration 
            if (userResponse == 'h' || userResponse == 'H')
            {
                lowerBound = guess;
            }else if (userResponse == 'l' || userResponse == 'L')
            {
                upperBound = guess;
            }else if (userResponse == 'c' || userResponse == 'C')
            {
                shouldPlayAgain();
                playOneGame();
            }

        }while(userResponse != 'c' || userResponse != 'C');

    }

    //method to ask and allow user if they would like to play the game again
    public static boolean shouldPlayAgain()
    {
        //Prompt User if they would like to play again
        System.out.print("Great! Would you like to play again? (y/n): ");

        //Read in a character
        Scanner input = new Scanner(System.in);
        char value = input.next().charAt(0);

        //if true return y char
        return value == 'y' || value == 'Y';
    }

    //method to get response from user for computer to guess if number is high, low, or correct
    public static char getUserResponseToGuess(int guess)
    {
        //char response = guess;
        Scanner input = new Scanner(System.in);

        //declare local variable for user's response
        char response;

        do
        {
            //print out message with guess number and take input of h/l/c
            System.out.print("Is the number " + guess + "? (h/l/c): ");

            //Read in character
            response = input.next().charAt(0);

        }while(response != 'h' && response != 'l' && response != 'c'); //display guess and get user input while input does not equal h/l/c

        return response;
    }

    //method to find the midpoint from two integers. take smaller number if 2 to return with 2 integers
    public static int Midpoint(int low, int high)
    {
        int midpoint; //midpoint is a local variable

        midpoint = (high+low)/2; //compute midpoint between upper and lower bounds

        return midpoint;
    }
}

Answer 1

您调用 shouldPlayAgain() 时未使用 return 值。

         if (shouldPlayAgain()){
            playOneGame();
          }

Answer 2

问题在这里：

        }else if (userResponse == 'c' || userResponse == 'C')
        {
            shouldPlayAgain();
            playOneGame();
        }

你问玩家是否想再玩一轮，然后...什么也不做，运行无论如何再玩一轮。试试这个：

        {
            if(shouldPlayAgain()){
                playOneGame();
            }
        }

Answer 3

当您编写以下代码时，您正在迭代且代码中没有退出条件：

else if (userResponse == 'c' || userResponse == 'C')
            {
                shouldPlayAgain();
                playOneGame();

            }

你可以这样写：

else if (userResponse == 'c' || userResponse == 'C') { break; }

然后你return控制主循环。

此致，

Answer 4

尝试运行下面的代码。我已尝试调整您的代码，其中包括条件改进和循环删除。

package test;

import java.util.Scanner;

public class NumberGuesser 
{

    public static void main(String[] args)
    {
/*Reduntant loop removal by codechef*/        
//        do
//        {
            playOneGame();
//        }
//        while(/*shouldPlayAgain()*/false);
    }

    //method for complete guessing number game between 1 and 100
    public static void playOneGame()
    {
        //initial lower range to 0 and upper range to 100
        int lowerBound = 0;
        int upperBound = 100;

        //Display message for user to guess a nummber
        System.out.println("Guess a number between 1 and 100.");

        //declare variables for program's number guess and user's response if number is higher or lower
        int guess;
        char userResponse;
         boolean temp = true;
         one :do //do while loop to make number guesses until correct number is found
        {
            //call method to guess midpoint number
            guess = Midpoint(lowerBound,upperBound);

            // call method to get response from user if number is high low or correct
            userResponse = getUserResponseToGuess(guess);

            //decision structure if-else statements to set new lower/upper bounds after every iteration 
            if (userResponse == 'h' || userResponse == 'H')
            {
                lowerBound = guess;
            }else if (userResponse == 'l' || userResponse == 'L')
            {
                upperBound = guess;
            }else if (userResponse == 'c' || userResponse == 'C')
            {
                /* Block restructured by codechef */
                temp = shouldPlayAgain();
                if(temp)
                {
                    System.out.println("TEMP : "+temp);
                    //playOneGame();
                    continue one;
                }else{
                    System.out.println("Breaking Loop");
                    break one;
                }
            }
            /*condition restructured by codechef*/
        }while((userResponse != 'c' || userResponse != 'C' )&& temp);

    }

    //method to ask and allow user if they would like to play the game again
    public static boolean shouldPlayAgain()
    {
        //Prompt User if they would like to play again
        System.out.print("Great! Would you like to play again? (y/n): ");

        //Read in a character
        Scanner input = new Scanner(System.in);
        char value = input.next().charAt(0);

        //if true return y char
        /* statement restructured by codechef */
        return (value=='y'||value=='Y')?true:false;
    }

    //method to get response from user for computer to guess if number is high, low, or correct
    public static char getUserResponseToGuess(int guess)
    {
        //char response = guess;
        Scanner input = new Scanner(System.in);

        //declare local variable for user's response
        char response;
/* Reduntant While loop removal by codechef*/
//        do
//        {
            //print out message with guess number and take input of h/l/c
            System.out.print("Is the number " + guess + "? (h/l/c): ");

            //Read in character
            response = input.next().charAt(0);
            System.out.println("RESONSE : "+response);
//        }while(response != 'h' && response != 'l' && response != 'c'); //display guess and get user input while input does not equal h/l/c

        return response;
    }

    //method to find the midpoint from two integers. take smaller number if 2 to return with 2 integers
    public static int Midpoint(int low, int high)
    {
        int midpoint; //midpoint is a local variable

        midpoint = (high+low)/2; //compute midpoint between upper and lower bounds

        return midpoint;
    }
}

输出：-

run:

Guess a number between 1 and 100.

Is the number 50? (h/l/c): l

RESONSE : l

Is the number 25? (h/l/c): c

RESONSE : c

Great! Would you like to play again? (y/n): y

TEMP : true

Is the number 25? (h/l/c): c

RESONSE : c

Great! Would you like to play again? (y/n): n

Breaking Loop

有关更改，请阅读添加的评论。希望这有帮助。

JAVA 猜数游戏使用方法：重玩方法不正常

JAVA number guessing game using methods: method for play again does not work properly

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