java - 如何在 if 循环中询问特定条件的输入

Question

在 check_mark() 方法中，如果我为 PHYSICS 放置了错误的标记（位于第二个位置 a[1] ），即标记 > 100，它会进入 if 循环，它必须要求输入相同的 PHYSICS 标记，但是它又从a[0] 即 MATHS...... 与 ENGLISH 相同，它再次从 MATHS 开始。

请帮我解决这个问题，它必须要求输入错误输入的特定标记....

故障代码：

import java.util.Scanner;

class averageMark
{
    static int no_of_students=2;
    static int a[]=new int[3];
    static int no_of_subjects=a.length;
    static String b[]=new String[]{"MATHS","PHYSICS","ENGLISH"};
    static int avg;
    static int total_marks=0;
    static Scanner sc=new Scanner(System.in);

    void check_mark()
    {
       for (int j = 0; j < 3; j++) 
       {
           System.out.print("Enter "+b[j]+" mark: ");
           a[j]=sc.nextInt();
           if(a[j]>100)
           {
               System.out.println("Please provide correct mark which is equal to or below 100");
               check_mark();
           }
       }
   }

   public static void main( String[] args )
   {
      for (int i = 0; i < no_of_students; i++) 
      {    
        averageMark check=new averageMark();
        check.check_mark();
        for (int k = 0; k < no_of_subjects; k++) 
        {
            total_marks+=a[k];
        }
        avg=total_marks/no_of_subjects;
        System.out.println();
        System.out.println("The average is: "+avg);
        if(avg>=70)
        {
            System.out.println();
            System.out.println("!!!Qualified!!!");   
        }
        else
        {
            System.out.println();
            System.out.println("!!!Not qualified!!!");
        }
        System.out.println();
    }
    sc.close();
    }
 }

标签： javaarraysloopsfor-loopif-statement

Answer 1

如果标记不正确，则不应调用 check_mark 方法。你应该减少索引

void check_mark() {
   for (int j = 0; j < 3; j++) {
       System.out.print("Enter "+b[j]+" mark: ");
       a[j]=sc.nextInt();
       if(a[j]>100) {
           System.out.println("Please provide correct mark which is equal to or below 100");
           j--;
       }
   }
}