卡住循環找到總和和平均值

Question

這是我第二次使用堆棧溢出，我剛開始編碼。

寫一個名爲Assignment4a的類，提示用戶輸入學生人數，然後要求他們輸入這些學生的考試成績。然後，您的課程將計算並打印課程的總和和平均考試成績。

import java.util.Scanner; 

public class Homework5A { 
    public static void main (String[]args) { 
     Scanner kbd = new Scanner(System.in); 

     String student; 
     int grades = 0; 
     double sum = 0; 
     double avg = 0; 

     for(int i=1; i<=grades; i++) { 
     System.out.println("How many students?"); 
     student= kbd.nextLine(); 
     System.out.println("Enter " + student + " grades: "); 
     grades= kbd.nextInt(); 
     System.out.print("Sum: " + sum); 
     sum = sum + grades; 
     } 

     System.out.println("Average " + sum/students); 



    } 
} 

Answer 1

for(int i=1; i<=grades; i++) {} 

不能初始化for循環語句是1，終點從0開始（因爲當前等級= 0）。

Answer 2

試試這個

import java.util.Scanner; 

    import java.util.Scanner; 
    public class Test { 

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

     int student; 
     int grades = 0; 
     double sum = 0; 
     double avg = 0; 

     System.out.println("How many students?"); 
     student= kbd.nextInt(); 
     System.out.println("Enter " + student + " grades: "); 
     for(int i=0; i<student; i++) { 
     grades= kbd.nextInt(); 
     sum = sum + grades; 
     System.out.println("Sum: " + sum); 
     } 

     System.out.println("Average " + sum/student); 



    } 
} 

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