java - 创建一个重复循环，以便程序会询问用户是否需要另一个条目，直到用户指示 “No.”

Question

这是作业的要求: 我需要创建一个 Java 程序来接受以下两个变量的输入:(a) 学生和 (b) 分数。 我还需要创建一个重复循环，以便程序会询问用户是否需要另一个条目，直到用户表示“否”。 我需要包含一个变量来计算整个类(class)的平均分数。 我需要创建一个变量，该变量将使用图表根据学生的分数分配字母等级(A=.93、A-=.90 B=.87 等) 我必须创建一个变量，列出获得以下每个成绩范围的学生人数:A、B、C、D 和 F。(请注意，“+”和“-”成绩属于一般字母成绩范围.)

我能够拼凑出部分代码，但无法将它们组合在一起。这是我的第一个类，没有关于如何继续的真正指导或方向。以下是我尝试集成的代码片段。

package gradeproject;
import java.util.Scanner;
import java.util.InputMismatchException;
public class ComputeGradeTryCatch {

public static void main(String[] args) {

    // This is the first piece of the code.

            int score1;
    Scanner s = new Scanner (System.in);
    System.out.println("Enter Student Name: ");
    String name = s.next();

    boolean done = false;
    while (!done) {

    System.out.println("Enter one test score: ");
    try
    {
    score1 = s.nextInt();
    done = true;

    }
    catch (InputMismatchException e){
    System.out.println("Enter a Numeric Value");
    }
    s.nextLine();


            //This is a second piece of the code

Scanner s = new Scanner (System.in);
    System.out.println("Enter Student Name: ");
    String name = s.next();
    System.out.println("Enter three test scores: ");
    int score1 = s.nextInt();
    int score2 = s.nextInt();
    int score3 = s.nextInt();
char letterGrade;
    double average = (score1 + score2 +score3)/3;
    System.out.println("Name: " + name);
    System.out.println("Scores are: " + score1 + "" + score2 + "" +            score3);
    System.out.println("Average: " + average);
if ((average >=90  && average <=100 ))
letterGrade = 'A';
else if ((average >=80  && average <=90 ))
letterGrade = 'B';
else if ((average >=70  && average <=80 ))
letterGrade = 'C';
else if ((average >=60  && average <=70 ))
letterGrade = 'D';
else letterGrade = 'F';

    System.out.println(" Letter Grade is : " + letterGrade);

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
\\\\This is the third piece of the code

Scanner scan = new Scanner(System.in);
static String userInput = null;
{
    checkPrime();
    while (true)
    {
        System.out.print("Do You Want to Continue (Y/N) ?");


        if (userInput.equalsIgnoreCase("Y"))
            checkPrime();
        else if (userInput.equalsIgnoreCase("N"))
        {
        System.out.print("Thank you !!");
            break;
        }
        else{
        System.out.print("Try Again With (Y/N) only !");   
        }

\\This has been a rather challenging task. Thank you for your help             and support!

There are errors in all of the three parts of the code when I run    it. My goal is to put together a clean piece of code that will execute the desire outcome in a concise manner.

Answer 1

您没有正确使用函数。

两次编写 checkPrime() 时，您都只是调用一个名为 checkPrime() 的函数，我认为该函数不存在(或者至少您没有提供该函数的代码)。

你应该这样做:

public static void main(String[] args) {
    Scanner s = new Scanner (System.in);
    do {
        print("What do you want to do? a) Add a new student with one score b) Add a student with three scores");
        String input = s.next()
        if (input.equals("a")) {
            // Do your A stuff
        } else if (input.equals("b")) {
            // Do your B stuff
        }
        print("Do you want to continue? (Y/N)");
        input = s.next()
    } while (!input.equalsIgnoreCase("N"))
}

请记住，前面的代码尚未完成，只是为了给您一些指导，以帮助您了解应该做什么。