Java GPA陣列掃描儀輸入和計算

Question

我正在嘗試使用掃描儀輸入來計算數組的GPA。我會認爲一個while循環會是最好的，但我不確定。我有一個方法可以嘗試從掃描器輸入到陣列中計算GPA。我的代碼已附加。讓我知道最簡單的方法是什麼。

import java.util.Scanner; 


public class gpaArrayInput 
{ 

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


    Scanner scan = new Scanner (System.in); 

    int i = 0; 
    //double average; 
    int grades[]=new int [i]; 


    for (i=0; i<grades.length;i++){ 

    System.out.println ("Enter your final class grades for the semester: "); 
     grades[i]=scan.nextInt(); 

    averageMethod(); 
    }} 




public static void averageMethod() 
{ 
    double sum=0; 
    double average; 

    for(int i=0; i<grades.length;i++) 
    { 

     sum += grades[i]; 

    } 

    average = sum/grades.length; 


    System.out.println("Your grade average is: "+average); 
} 

} 

Answer 1

這是Scanner documentation。

快速測試之後，這似乎工作：

import java.util.Scanner; 

class ClassNamesShouldBeCapitalized 
{ 
    public static void main(String[] args) 
    { 
     Scanner gradeScanner = new Scanner(System.in); 

     int gradeCounter = 0; 
     int gradeTotal = 0; 

     System.out.println("Input grade: "); 

     while(gradeScanner.hasNextInt()) { 
      int nextGrade = gradeScanner.nextInt(); 
      System.out.println("Recorded grade: " + nextGrade); 
      System.out.println("Input grade: "); 
      gradeTotal += nextGrade; 
      gradeCounter++; 
     } 

     if (gradeCounter > 0) { 
      double avg = gradeTotal/gradeCounter; 
      System.out.println("Here's your average: " + avg); 
     } 
     else { 
      System.out.println("No grades found."); 
     } 
    } 
}