package com.exchange;

import java.util.Scanner;

import javax.swing.JOptionPane;

public class Fivestudentgrade {
    private static double[] score;

    public static void main(String[] args) {

        System.out.println("请输入五位学生的成绩：");

        score = new double[5];
        for (int i = 0; i < 5; i = i + 1) {
            Scanner scanner = new Scanner(System.in);
            double a = scanner.nextDouble();
            if (a < 0 || a > 100)
                System.out.println("Plase enter again");
            else
                score[i] = a;
        }

        int choice = mainMenu();

            switch (choice) {
            case 1:
                sumGrade();
                break;

            case 2:
                
                averageGrade();
                break;

            case 3:
                highGrade();
                break;

            case 4:
                lowestGrade();
                break;
            case 5:
                System.exit(1);
            default:
                System.out.println("Not a valid option, select again");
            }

        }
    

    public static int mainMenu() {
        JOptionPane.showMessageDialog(null, "1. sumgrade" + "\n"
                + "2. averagegrade" + "\n" + "3. highestgrade" + "\n"
                + "4. lowestgrade" + "\n" + "5. Exit","菜单",JOptionPane.PLAIN_MESSAGE);

        System.out.println("Enter an option ");

        Scanner scanner = new Scanner(System.in);
        int i = scanner.nextInt();
        return i;
    }

    public static void sumGrade() {
        double sumGrade = 0.0;
        for (int i = 0; i < 5; i++) {
            sumGrade = score[i] + sumGrade;
        }
        System.out.println("sumGrade=" + sumGrade);
    }

    public static void averageGrade()
    
    {
        double average = 0.0;
        for (int i = 0; i < 5; i++) {
            average = score[i] / 5 + average;
        }
        System.out.println("average="+average);
    }

    public static void highGrade() {
        double maxgrade = 0.0;
        for (int i = 0; i < 5; i++) {
            if (score[i] > maxgrade)
                maxgrade = score[i];
        }
        System.out.println("maxgrade=" + maxgrade);
    }

    public static void lowestGrade() {
        double mingrade = 0.0;
        for (int i = 0; i < 5; i++) {
            if (score[i] < mingrade)
                mingrade = score[i];
        }
        System.out.println("mingrade=" + mingrade);
    }

}