虽然计数器不起作用

Question

我是Java 新手，正在制作一个猜谜游戏，用户必须在其中猜一个 0 到 50 之间的随机整数。

我正在尝试在游戏中添加一个猜测计数器，在“游戏结束”之前让用户最多 7 个 猜测 但是，计数器继续运行甚至高于7 尽管我的while循环。

如果这是一个重复的问题，我提前道歉，但是我确实看了一眼，并没有为我的代码找到一个好的答案

代码如下：

package guessinggame;
import java.util.Random;
import java.util.Scanner;
public class GuessingGame {
//Author TC13551 


public static void main(String[] args) {
    int NumberGuess = 0;
    Random randomNumber = new Random();
    int randomInt = randomNumber.nextInt(51);
    System.out.println("Guess the number between 0 -50:");
    int i = 0;
    while( i < 8){
    do{

       Scanner UserGuess = new Scanner(System.in);
       NumberGuess = UserGuess.nextInt();
       if(NumberGuess < 0 || NumberGuess > 50){
           System.out.println("Invalid Input, please enter numbers between 0 and 50");
       }
       else if(NumberGuess < randomInt){
            System.out.println("Guess is too small.");
            i ++;
            System.out. println("You have made "+i +" guesses out of 7");
        } 

        else if(NumberGuess > randomInt) {
           System.out.println("Guess is too big.");
            i ++;
             System.out. println("You have made "+i +" guesses out of 7");

        }
            else if(NumberGuess == randomInt){
            System.out.println("Correct! You win!");
            System.out.println("It took you "+ i + " guesses.");
            System.exit(0);
        } 


    }while(randomInt != NumberGuess);


}System.out.println("Game over!");
System.out.println("All 7 Guesses used!");
System.exit(0);

    }}

Answer 1

如果您希望在 7 次猜测后终止，则应该有一个循环：

do {
    ....
} while(randomInt != NumberGuess) && (i < 8);

当您仅在外循环中测试i 时，您会给用户无限次猜测，因为只有在用户猜对了数字后您才会离开内循环。只有在你离开内部循环之后，你才能测试猜测的数量。

Answer 2

您也可以检查存在条件，如果没有猜到并且i 值超出给定机会（例如：在您的情况下为 7）：

 }while(i < 8);

注意：删除了不必要的条件，请参阅@Rehman 评论。
如果用户猜对了数字，您可以删除 randomInt != NumberGuess，就像您拥有 System.exit(0) 一样。

Answer 3

我认为它可能会解决您的问题，

import java.util.Random;
import java.util.Scanner;
public class GuessingGame {
    //Author TC13551 


    public static void main(String[] args) {
        int NumberGuess = 0;
        Random randomNumber = new Random();
        int randomInt = randomNumber.nextInt(51);
        System.out.println("Guess the number between 0 -50:");
        int i = 0;
            do{

                Scanner UserGuess = new Scanner(System.in);
                NumberGuess = UserGuess.nextInt();
                if(NumberGuess < 0 || NumberGuess > 50){
                    System.out.println("Invalid Input, please enter numbers between 0 and 50");
                }
                else if(NumberGuess < randomInt){
                    System.out.println("Guess is too small.");
                    i ++;
                    System.out. println("You have made "+i +" guesses out of 7");
                } 

                else if(NumberGuess > randomInt) {
                    System.out.println("Guess is too big.");
                    i ++;
                    System.out. println("You have made "+i +" guesses out of 7");

                }
                else if(NumberGuess == randomInt){
                    System.out.println("Correct! You win!");
                    System.out.println("It took you "+ i + " guesses.");
                    System.exit(0);
                } 


            }while(i < 8);

            System.out.println("Game over!");
        System.out.println("All 7 Guesses used!");
        System.exit(0);

    }}

Answer 4

public class GuessingGame {
    public static void main(String[] args) {
        int NumberGuess = 0;
        Random randomNumber = new Random();
        int randomInt = randomNumber.nextInt(51);
        System.out.println("Guess the number between 0 -50:");
        int i = 1;
        Scanner UserGuess = new Scanner(System.in);

        while (i <= 7) {

            NumberGuess = UserGuess.nextInt();
            if (NumberGuess == randomInt) {
                System.out.println("Correct! You win!");
                System.out.println("It took you " + i + " guesses.");
                System.exit(0);
            } else if (NumberGuess < 0 || NumberGuess > 50) {
                System.out.println("Invalid Input, please enter numbers between 0 and 50");
            } else if (NumberGuess < randomInt) {
                System.out.println("Guess is too small.");
            } else if (NumberGuess > randomInt) {
                System.out.println("Guess is too big.");
            }
            System.out.println("You have made " + i + " guesses out of 7");
            i++;
        }

        System.out.println("Game over!");
        System.out.println("All 7 Guesses used!");
        System.exit(0);
    }
}

你也不应该Scanner UserGuess = new Scanner(System.in); 在循环中使用这个语句。 在循环之外只应创建一份扫描仪副本。