Question

我是编程的新手，我无法让计数器增加或存储每个while循环的成绩。该程序假设接受作业的等级然后对其进行平均，然后接受测验的等级然后对其进行平均，并且对于测试进行相同的评分，最后将3个平均值平均在最后。

import java.util.Scanner;

public class Homework3 {

    public static void main ( String[] args ) {
        Scanner input = new Scanner( System.in );
        int number1;
        int totalhomework = 0;
        int counterhomework = 0;
        double averagehomework = 0;

        String name;
        int homeworkgrade = 0;
        int totalquiz = 0;
        int counterquiz = 0;
        double averagequiz = 0;

        int quizgrade = 0;
        int totaltest = 0;
        int countertest = 0;
        double averagetest = 0;
        int testgrade = 0;

        double finalaverage = 0;
        boolean run = true;

        do {
            System.out.print("\nEnter 1 to average grades for new student");
            System.out.print("\n Enter 2 to quit");
            number1 = input.nextInt();
            if (number1 == 1) {
                System.out.println("\nWhat is the student's name?");
                name = input.next();
            }
            if (number1 == 2) { 
                System.out.print("\nThank you");
                System.exit(1);
            }
            counterhomework = 0;
            totalhomework = 0;

            do {
                counterhomework++;
                totalhomework = totalhomework + homeworkgrade;
                System.out.println("\nFirst enter Homework grades then type " +
                    "-1 to move onto next category"
                );
                homeworkgrade = input.nextInt();
            } while(homeworkgrade != -1);

            if (homeworkgrade == -1) {
                System.out.print("\nYour Homework average is:" + 
                    averagehomework
                );
                averagehomework = totalhomework/counterhomework;
            }
            do { 
                counterquiz = counterquiz +1;
                System.out.print("\nNext enter quiz grades then type -1 " +
                    "to move onto next category"
                );
                totalquiz = totalquiz + quizgrade;
                quizgrade = input.nextInt();

            } while (quizgrade != -1);

            if (quizgrade ==-1) {
                System.out.print("\nYour quiz average is:" + averagequiz);
                averagequiz = totalquiz/counterquiz;
            }
            do { 
                countertest = countertest +1;
                System.out.print("\nFinally enter test grades then type " +
                    "-1 when finished"
                );
                totaltest = totaltest + testgrade;
                testgrade = input.nextInt();
            } while (testgrade != -1);

            if (testgrade == -1) {
                System.out.print("\nYour test average is:" +averagetest);
                averagetest = totaltest/countertest;
            }
            System.out.print(name);
            System.out.print("final average is:" + finalaverage);
            finalaverage = 0.25 * averagehomework + 0.25 * averagequiz +
                0.50 * averagetest;
        } while (number1 != 2);
    } //main
} //class

Answer 1

我猜您的问题是averagehomework= 0.0，这是因为您在计算之前打印averagehomework，所以请点击它：

averagehomework = totalhomework / counterhomework;
 System.out.print("\nYour Homework average is:" + averagehomework);

你需要初始化name变量，如下所示：

String name = "";

counterhomework需要按-1

进行初始化

无法让Java工作

1 个答案: