Question

我正在为我的初学Java类工作。该程序是一个利用嵌套while循环的数学测验。我对程序过早结束有问题。以下是产生问题的块的代码：

它应该循环输入作为NumberOfQuestionsInteger输入的次数，但无论你为NumberOfQuestionsInteger输入什么，它都只循环一次。

代码有点草率，因为我一直在搞乱所有试图让它工作的东西。

编辑：更新为完整代码。

当我禁用threeTries循环时代码有效。

任何帮助都会有很大帮助！

import javax.swing.JOptionPane;
import java.util.Random; //import Random class

public class HroudaASSN2 {

public static void main(String[] args) {
    // TODO Auto-generated method stub


     String NumberOfQuestions = JOptionPane.showInputDialog("How Many Questions Would You Like To Answer?");
     int NumberOfQuestionsInteger = Integer.parseInt(NumberOfQuestions); //Converts string to Integer, I named it NumberOfQuestionsInteger so as to make that clear.

     int score, threeTries;
     threeTries = 3;
     score = 0;


     while (NumberOfQuestionsInteger > 0) // Allows the program to run until exited.
        {

         Random firstNum1 = new Random(); //create an object of Random class
         int firstNum = firstNum1.nextInt(100) + 1; //generate number between 1 and 100.

         Random secondNum2 = new Random(); //create an object of Random class
         int secondNum = secondNum2.nextInt(100) + 1; //generate2 number between 1 and 100.

             while(threeTries > 0){
                 String Answer = JOptionPane.showInputDialog("Score :" + score +"\ntries remaining: " + threeTries + "\n\n\n" + firstNum + "+" + secondNum);
                 int AnswerInteger = Integer.parseInt(Answer); //Converts string to Integer.


                    if (AnswerInteger == firstNum + secondNum)
                    {
                        threeTries = 0;
                        JOptionPane.showMessageDialog(null," Correct! \n +5 Points!");
                        score = score + 5;
                        NumberOfQuestionsInteger = NumberOfQuestionsInteger-1;
                    }

                    else
                    {
                        threeTries = threeTries - 1;
                        NumberOfQuestionsInteger = NumberOfQuestionsInteger-1;
                    }
             }
        }
                    /* if (threeTries > 0);{
                         comment.equals("Please Try Again!");
                         }
                         else
                             {comment.equals("No Attempts Remaining!");
                             JOptionPane.showMessageDialog(null," Wrong! \n -1 Point! \n Please Try Again!");
                             score = score--; }   */




}
        }

Answer 1

你需要：

在外循环中递减NumberOfQuestionsInteger，所以移动
```
NumberOfQuestionsInteger = NumberOfQuestionsInteger - 1;
```
从内部循环中的if到外循环。
重置每个内循环之前的可用尝试次数，以便移动
```
threeTries = 3;
```
在外圈开始时

您不需要很少Random级的实例。一个就够了。也不要在循环中初始化它。在循环之前执行此操作

Random rand = new Random();
while(NumberOfQuestionsInteger > 0){
    int firstNum = rand.nextInt(100) + 1;
    int secondNum= rand.nextInt(100) + 1;
    //...
}

Answer 2

threeTries = 3;
while(threeTries > 0){
   String Answer = JOptionPane.showInputDialog("Score :" + score +"\ntries remaining: " + threeTries + "\n\n\n" + firstNum + "+" + secondNum);
                int AnswerInteger = Integer.parseInt(Answer); //Converts string to Integer.
                if (AnswerInteger == firstNum + secondNum)
                {
                    threeTries = 0;
                    JOptionPane.showMessageDialog(null," Correct! \n +5 Points!");
                    score = score + 5;
                }

                else
                {
                    threeTries = threeTries - 1;
                }
}
NumberOfQuestionsInteger = NumberOfQuestionsInteger-1;

JAVA嵌套而循环错误 - 应该非常简单

2 个答案: