如何为我的方法获得正确的输出？

时间：2014-02-09 18:41:11

标签： java arrays

我想要显示测验，实验室，实验室出勤，像这样的Midterms- 测验：66％ 实验室：88％ 实验室出勤率：81％ 中期：91％ 最终：不适用 总体平均值：85％。 但是我得到了

输出：

66.0
88.0
81.0
91.0

我如何获得正确的输出以实现我想要完成的任务。 

import java.io.*;
    import java.util.*;

public class FindGrade {
    public static final int NUM_SCORE_TYPES = 5;

    public static void main(String[] args) {
        Scanner scan = null;
        int[] quizArray = null;
        int[] labArray = null;
        int[] attendance = null;
        int[] midterms = null;
        int quizgrade = 0;
        int labgrade = 0;
        int attendance_1 = 0;
        int midterms_1 = 0;
        String name;


        try {
            scan = new Scanner(new File("input.txt"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return;
        }

        // each iteration is for single exam type (ie: Quizzes is the 1st one)
        for (int i = 0; i < NUM_SCORE_TYPES; i++) {

            name = scan.next();
            int numScores = scan.nextInt();
            int maxGrade = scan.nextInt();

            if (name.equals("Quizzes")) {
                quizArray = new int[numScores];
                readScores(quizArray, numScores, scan,maxGrade);


            } else if (name.equals("Labs")) {
                labArray = new int[numScores];
                readScores(labArray, numScores, scan,maxGrade);

            } else if (name.equals("Lab_attendance")) {
                attendance = new int[numScores];
                readScores(attendance, numScores, scan,maxGrade);

            } else if (name.equals("Midterms")) {
                midterms = new int[numScores];
                readScores(midterms, numScores, scan,maxGrade);

            }

        }

    }


    public static void readScores(int[] scoreArray, int numScores, Scanner scan, int maxGrade) {
        for (int i = 0; i < numScores; i++) {
            scoreArray[i] = scan.nextInt();
        }
        System.out.println(average(scoreArray, numScores, maxGrade));
    }

    public static int normalize(int[] scoreArray, int maxGrade) {
        int total = 0;
        for (int i = 0; i < scoreArray.length; i++) {
            total += scoreArray[i];
        }
        int percent = Math.round(total * 100 / maxGrade);
        return percent;
    }

    public static double average(double[] scoreArray, int numScores,int maxGrade) {
        double sum = 0;
        for (int i = 0; i < scoreArray.length; i++) {
            sum += scoreArray[i];
        }
        double average = Math.round((sum / numScores)*100/maxGrade);

        return average;

}

输入文件：

Quizzes 8 10
5 8 9 10 4 0 10 7
Labs 6 100
95 90 100 87 63 92
Lab_attendance 16 1
1 1 1 0 1 1 1 1 0 1 1 1 1 0 1 1
Midterms 2 100
87 94
Final 0 100

3 个答案:

答案 0 :(得分：0)

您需要将名称传递给平均值并打印名称和分数。 通过建议查看固定代码下方，它提供您正在寻找的输入。

import java.io.*;
import java.util.*;

public class FindGrade {
public static final int NUM_SCORE_TYPES = 5;

public static void main(String[] args) {
    Scanner scan = null;
    int[] quizArray = null;
    int[] labArray = null;
    int[] attendance = null;
    int[] midterms = null;
    int quizgrade = 0;
    int labgrade = 0;
    int attendance_1 = 0;
    int midterms_1 = 0;
    String name;


    try {
        scan = new Scanner(new File("c:\\temp\\input.txt"));
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return;
    }

    // each iteration is for single exam type (ie: Quizzes is the 1st one)
    for (int i = 0; i < NUM_SCORE_TYPES; i++) {

        name = scan.next();
        int numScores = scan.nextInt();
        int maxGrade = scan.nextInt();

        if (name.equals("Quizzes")) {
            quizArray = new int[numScores];
            readScores(quizArray, numScores, scan,maxGrade, "Quizzes");


        } else if (name.equals("Labs")) {
            labArray = new int[numScores];
            readScores(labArray, numScores, scan,maxGrade, "Labs");

        } else if (name.equals("Lab_attendance")) {
            attendance = new int[numScores];
            readScores(attendance, numScores, scan,maxGrade, "Lab_attendance");

        } else if (name.equals("Midterms")) {
            midterms = new int[numScores];
            readScores(midterms, numScores, scan,maxGrade, "Midterms");

        }

    }

}


public static void readScores(int[] scoreArray, int numScores, Scanner scan, int maxGrade, String name) {
    for (int i = 0; i < numScores; i++) {
        scoreArray[i] = scan.nextInt();
    }
    average(scoreArray, numScores, maxGrade, name);
}

public static int normalize(int[] scoreArray, int maxGrade) {
    int total = 0;
    for (int i = 0; i < scoreArray.length; i++) {
        total += scoreArray[i];
    }
    int percent = Math.round(total * 100 / maxGrade);
    return percent;
}

public static double average(int[] scoreArray, int numScores,int maxGrade, String name) {
    double sum = 0;
    for (int i = 0; i < scoreArray.length; i++) {
        sum += scoreArray[i];
    }
    double average = Math.round((sum / numScores)*100/maxGrade);

    System.out.println( name + ":" + average);

    return average;
}
}

然后在运行时预期输出：

Quizzes:66.0
Labs:88.0
Lab_attendance:81.0
Midterms:91.0

答案 1 :(得分：0)

这是您修改过的代码＆amp;预期o / p：

import java.io.*;
import java.util.*;

public class FindGrade {
public static final int NUM_SCORE_TYPES = 5;

public static void main(String[] args) {
    Scanner scan = null;
    String quizzes=  "Quizzes";
    String labs= "Labs";
    String lab_attendance=  "Lab_attendance";
    String midterm=  "Midterms";
    int[] quizArray = null;
    int[] labArray = null;
    int[] attendance = null;
    int[] midterms = null;
    int quizgrade = 0;
    int labgrade = 0;
    int attendance_1 = 0;
    int midterms_1 = 0;
    String name;


    try {
        scan = new Scanner(new File("C://Users//Desktop//input.txt"));
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return;
    }

    // each iteration is for single exam type (ie: Quizzes is the 1st one)
    for (int i = 0; i < NUM_SCORE_TYPES; i++) {

        name = scan.next();
        int numScores = scan.nextInt();
        int maxGrade = scan.nextInt();

        if (name.equals("Quizzes")) {
            quizArray = new int[numScores];
            readScores(quizArray, numScores, scan,maxGrade, quizzes);


        } else if (name.equals("Labs")) {
            labArray = new int[numScores];
            readScores(labArray, numScores, scan,maxGrade, labs);

        } else if (name.equals("Lab_attendance")) {
            attendance = new int[numScores];
            readScores(attendance, numScores, scan,maxGrade,lab_attendance );

        } else if (name.equals("Midterms")) {
            midterms = new int[numScores];
            readScores(midterms, numScores, scan,maxGrade, midterm);

        }

    }

}


public static void readScores(int[] scoreArray, int numScores, Scanner scan, int maxGrade, String name) {
    for (int i = 0; i < numScores; i++) {
        scoreArray[i] = scan.nextInt();
    }
    average(scoreArray, numScores, maxGrade, name);
}

public static int normalize(int[] scoreArray, int maxGrade) {
    int total = 0;
    for (int i = 0; i < scoreArray.length; i++) {
        total += scoreArray[i];
    }
    int percent = Math.round(total * 100 / maxGrade);
    return percent;
}

public static double average(int[] scoreArray, int numScores,int maxGrade, String name) {
    double sum = 0;
    for (int i = 0; i < scoreArray.length; i++) {
        sum += scoreArray[i];
    }
    double average = Math.round((sum / numScores)*100/maxGrade);

    System.out.println( name + ":" + average+" %");

    return average;
}
}

结果是： 

Quizzes:66.0 %
Labs:88.0 %
Lab_attendance:81.0 %
Midterms:91.0 %**

答案 2 :(得分：-2)

您实际上并没有发布任何代码来打印任何，但您想要的可能是System.out.format()。

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