比较两个数组，增加计数器

Question

我无法理解为什么即使我输入了所有正确的答案，我的计数器仍会打印出不同的值。我已经尝试了我能想到的一切加上研究但仍然没有运气。请帮忙，这是我在这个 "simple" 项目上工作的第 14 个小时。

import java.util.Scanner; //import scanner

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

 Scanner input = new Scanner(System.in);
  char[] correctAnswers = {'A','D','C','A','A','D','B',
  'A','C','A','D','C','B','A','B'};
  char singleAnswer = ' ';
  int number_Correct = 0;
       for(int i = 0; i < 15; i++) //print question numbers/takes user input
          {
      System.out.println("Question " + (i + 1) + ":");
         singleAnswer = input.nextLine().charAt(0);
          }//end of for loop

   System.out.println("number correct: " +
        total_correct_answers(correctAnswers, singleAnswer));
  }//end of main

  public static int total_correct_answers(char []correctAnswers,char singleAnswer){
      int number_correct = 0;

      for (int i = 0; i < 15; i++){
         if(correctAnswers[i] == singleAnswer){
             number_correct++;}

        }//end of for loop
    return number_correct;
    }//end of correct method
  }//end of class

Answer 1

您的程序显示错误值的原因是 singleAnswer 变量仅存储用户最后给出的 value/answer。

我创建了一个数组 userAnswer 来存储所有给出的答案。

试试这个：

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

    Scanner input = new Scanner(System.in);
    char[] correctAnswers = {'A','D','C','A','A','D','B',
    'A','C','A','D','C','B','A','B'};
    char[] userAnswer = new char[correctAnswers.length];

    for(int i = 0; i < 15; i++) //print question numbers/takes user input
    {
      System.out.println("Question " + (i + 1) + ":");
      userAnswer [i] = input.nextLine().charAt(0);
    }//end of for loop

    System.out.println("number correct: " + total_correct_answers(correctAnswers, userAnswer));

    input.close();
  }//end of main

  public static int total_correct_answers(char []correctAnswers,char [] userAnswer) {
    int number_correct = 0;

    for (int i = 0; i < 15; i++){
        if(correctAnswers[i] == userAnswer[i]){
            number_correct++;
        }
    }//end of for loop
    return number_correct;
  }//end of correct method
}//end of class

Answer 2

对于每个问题，您在数组 correctAnswers 和 user-answer 中都有正确答案？在 singleAnswer 的这种模式下，您只保存用户的最后一个答案并检查每个答案。要解决这个问题，您可以像这样创建一个 singleAnswer 字符数组：

char[] singleAnswer=new char[15];

并将结果添加到数组中：

singleAnswer[i]=input.nextLine().chatAt(0);

在for循环中用这条指令查看结果是否正确后：

if(singleAnswer[i]==correctAnswers[i])  number_correct++;

比较两个数组，增加计数器

comparing two arrays, increasing counter

java

arrays

methods

loops

pass-by-value