import java.util.Scanner;public class AverageMark{    public static void main(String[] args) {        // TODO Auto-generated method stub        Scanner input = new Scanner(System.in);        int mark[] = { 0, 0, 0, 0 };            System.out.printf("Enter integer mark %s between 0 and 100: ", i + 1);        }        System.out.println("Thanks for entering your marks.\n");        double average = (mark[0] + mark[1] + mark[2] + mark[3]) * 0.25;        String grade;        if (average >= 90) {            grade = "A+";        } else if (average >= 80) {            grade = "A";        } else if (average >= 70) {            grade = "B";        } else if (average >= 60) {            grade = "C";        } else if (average >= 50) {            grade = "D";        } else            grade = "F";        System.out.printf("Your average is: %.2f\n", average);        System.out.printf("Your average of %.2f has a letter grade of %s", average, grade);    }}//嗨，抱歉之前的編輯，我是這個(gè)網(wǎng)站的新手。這是我寫(xiě)的代碼，但我不確定為什么它不會(huì)運(yùn)行。似乎有些東西可能會(huì)丟失，但我很不清楚。請(qǐng)幫忙謝謝