计数错误的结果

Question

导入java.util.Scanner；公共类GroupActivity{公共静态void main（）

{
  Scanner GActivity=new Scanner(System.in);

  System.out.println("Insert numbers of participants:");
  int participantNo= GActivity.nextInt();//Insert numbers of participants


  int music= 1;int art=2; int theatre= 3; int sport= 4; // Representation of each class by numbers.
  int countM=0; //This variable contains the number of the participants in music class.
  int countA=0; //This variable contains the number of the participants in art class.
  int countT=0; //This variable contains the number of the participants in theatre class.
  int countS=0; //This variable contains the number of the participants in sport class.

  for(int i=0;i<participantNo;i++)
  {
         System.out.println("Insert student in class:");
         int p= GActivity.nextInt();// // Representation of student by number.

         if(p==music)
         {
            countM++;
            System.out.println("student in class:"+music);
            System.out.println("Total:"+countM++);
         }
          else if(p==art)
         {
            countA++;
            System.out.println("student in class:"+art);
            System.out.println("Total:"+countA++);
         }
          else if(p==theatre)
         {
            countT++;
            System.out.println("student in class:"+theatre);
            System.out.println("Total:"+countT++);

        }
         else
            countS++;
            System.out.println("student in class:"+sport);
            System.out.println("Total:"+countS++);
        }

    }

  }

Answer 1

else
    countS++;
    System.out.println("student in class:"+sport);

你那里少了牙套！您的代码有效地运行如下：

else {
    countS++;
}
System.out.println("student in class:"+sport);

在else后面添加大括号以解决此问题。

此外，正如泰勒在评论中指出的那样，每增加一个学生，你就会增加两次音乐课计数器，而不是一次。

countS++; //countS is incremented by one
System.out.println("student in class:"+sport);
System.out.println("Total:"+countS++); //countS is incremented by one AGAIN