如何在此GPA計算器中構建我的for回圈？爪哇

如何在此 GPA 計算器中構建我的 for 回圈？全新的 Java，對于我們的班級，我們需要詢問用戶的等級和學分 4 次，然后計算他們的平均值。我們被指示使用 switch 陳述句和回圈，但沒有太多其他指令。我們剛剛了解了 for、while 和 do 回圈。這是我到目前為止所擁有的，不知道下一步該怎么做。

這就是輸出應該是什么樣子。

public static void main(String[] args) {
    String grade = "";
    int creditHour = 0;
    int pointsPerCourse = 0;
    double gpa = 0.0;
    
    Scanner scnr = new Scanner(System.in);
    
    System.out.println("\t\t\tpointsPerCourse Calculator");
    System.out.println("This program will calculate pointsPerCourses based on course grades");
    
    for ();
    {
        System.out.print("Enter grade: ");
        grade = scnr.nextLine();
        
        System.out.print("Enter number of credits for grade: ");
        creditHour = Integer.parseInt(scnr.nextLine());
    }
        
    switch (grade) {
        case "A":
            pointsPerCourse = 4 * creditHour;
        case "B":
            pointsPerCourse = 3 * creditHour;
        case "C":
            pointsPerCourse = 2 * creditHour;
        case "D":
            pointsPerCourse = 1 * creditHour;
        default:
            pointsPerCourse = 0 * creditHour;
    }   
            
    gpa = (double) pointsPerCourse / creditHour;
    System.out.printf("The GPA is %.1f ", gpa);

    scnr.close();
}

uj5u.com熱心網友回復：

這不是 golang，你不能使用這樣的for回圈，而且你想把你的開關盒放在回圈內。有人建議了一個while回圈，但由于您只想回圈 4 次以上，因此適當的for回圈可以為您完成。

for(int i = 0, i < 4, i  ){
 System.out.print("Enter grade: ");
    grade = scnr.nextLine();
    
    System.out.print("Enter number of credits for grade: ");
    creditHour = Integer.parseInt(scnr.nextLine());
    
    switch (grade) 
    {
    
      case "A":
        pointsPerCourse = 4 * creditHour;
      case "B":
        pointsPerCourse = 3 * creditHour;
      case "C":
        pointsPerCourse = 2 * creditHour;
      case "D":
        pointsPerCourse = 1 * creditHour;
        
      default:
        pointsPerCourse = 0 * creditHour;
     }
}

uj5u.com熱心網友回復：

我認為您正在嘗試這樣做：回圈 4 次并添加平均積分和學分

import java.util.Scanner;

class Prog {
    public static void main(String[] args) {

        String grade = "";
        int creditHour = 0;
        int creditHourSum = 0;
        int pointsPerCourse = 0;
        double gpa = 0.0;

        Scanner scnr = new Scanner(System.in);

        System.out.println("\t\t\tpointsPerCourse Calculator");
        System.out.println("This program will calculate pointsPerCourses based on course grades");

        for (int i = 0; i < 4; i  ) {
            System.out.print("Enter grade: ");
            grade = scnr.nextLine();

            System.out.print("Enter number of credits for grade: ");
            creditHour = Integer.parseInt(scnr.nextLine());
            creditHourSum  = creditHour;

            switch (grade) {

                case "A":
                    pointsPerCourse  = 4 * creditHour;
                    break;
                case "B":
                    pointsPerCourse  = 3 * creditHour;
                    break;
                case "C":
                    pointsPerCourse  = 2 * creditHour;
                    break;
                case "D":
                    pointsPerCourse  = 1 * creditHour;
                    break;
                default:
                    pointsPerCourse  = 0 * creditHour;
            }
            System.out.println(pointsPerCourse);
        }

        gpa = (double) pointsPerCourse / creditHourSum;
        System.out.println(pointsPerCourse   ", "   creditHourSum);
        System.out.printf("The GPA is %.1f ", gpa);

        scnr.close();

    }
}

輸出

This program will calculate pointsPerCourses based on course grades
Enter grade: A
Enter number of credits for grade: 4
16
Enter grade: E
Enter number of credits for grade: 4
16
Enter grade: B
Enter number of credits for grade: 4
28
Enter grade: C
Enter number of credits for grade: 3
34
34, 15
The GPA is 2.3

標籤：爪哇 循环 切换语句 gpa

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