Program Explanation Program: The GradeBook class stores data about student grades. //create a class public class GradeBook { // define the required constants private final int NUM_STUDENTS = 5; private final int NUM_TESTS = 4; // declare an array to hold student names private String[] names = new String[NUM_STUDENTS]; // declare an array to hold student grades private char[] grades = new char[NUM_STUDENTS]; // declare the arrays of scores, one for each student. private double[] scores1 = new double[NUM_TESTS]; private double[] scores2 = new double[NUM_TESTS]; private double[] scores3 = new double[NUM_TESTS]; private double[] scores4 = new double[NUM_TESTS]; private double[] scores5 = new double[NUM_TESTS]; // The setName method assigns a student's name. public void setName(int studentNumber, String name) { names[studentNumber - 1] = name; } // The setScores method copies an array of test scores to a student's array of scores. public void setScores(int studentNumber, double[] scores) { if (studentNumber == 1) copyArray(scores1, scores); else if (studentNumber == 2) copyArray(scores2, scores); else if (studentNumber == 3) copyArray(scores3, scores); else if (studentNumber == 4) copyArray(scores4, scores); else if (studentNumber == 5) copyArray(scores5, scores); assignGrade(studentNumber); } // The getName method returns a student's name. public String getName(int studentNumber) { // return statement return names[studentNumber - 1]; } // The getAverage method returns a student's average test score. public double getAverage(int studentNumber) { // declare the required variables double average; if (studentNumber == 1) average = calcAverage(scores1); else if (studentNumber == 2) average = calcAverage(scores2); else if (studentNumber == 3) average = calcAverage(scores3); else if (studentNumber == 4) average = calcAverage(scores4); else if (studentNumber == 5) average = calcAverage(scores5); else average = 0.0; // return statement return average; } // The getLetterGrade method returns a student's letter grade. public char getLetterGrade(int studentNumber) { // return statement return grades[studentNumber - 1]; } // copyArray is a private method that copies the contents of one array to another. private void copyArray(double[] to, double[] from) { for (int i = 0; i < to.length; i++) to[i] = from[i]; } // calcAverage is a private method that calculates the average of the values in an array of test scores. private double calcAverage(double[] scores) { double total = 0.0, average, lowest; // Find out the lowest score. lowest = scores[0]; for (int i = 1; i < scores.length; i++) { if (scores[i] < lowest) lowest = scores[i]; } // Calculate the total of the scores. for (int i = 0; i < scores.length; i++) total += scores[i]; // Drop the lowest score. total -= lowest; // Calculate the average. average = total / (scores.length - 1); // return statement return average; } // assignGrade is a private method that determines and assigns a letter grade to a specific student. private void assignGrade(int studentNumber) { // declare the required variables double average = getAverage(studentNumber); grades[studentNumber - 1] = determineGrade(average); } // determineGrade is a private method that determines a letter grade for a test average. private char determineGrade(double average) { // declare the required variables char grade; if (average >= 90 && average <= 100) grade = 'A'; else if (average >= 80 && average < 90) grade = 'B'; else if (average >= 70 && average < 80) grade = 'C'; else if (average >= 60 && average < 70) grade = 'D'; else if (average >= 0 && average < 60) grade = 'F'; else grade = '?'; // return statement return grade; } } This program demonstrates a solution...

Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)

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ISBN: 9780134802213

Author: Tony Gaddis

Publisher: PEARSON

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