// Fig. 7.17: GradeBook.cpp
// Member-function definitions for class GradeBook that
// uses an array to store test grades.
#include
using std::cout;
using std::cin;
using std::endl;
using std::fixed;
#include
using std::setprecision;
using std::setw;
#include "GradeBook.h" // GradeBook class definition
// constructor initializes courseName and grades array
GradeBook::GradeBook( string name, const int gradesArray[] )
{
setCourseName( name ); // initialize courseName
// copy grades from gradeArray to grades data member
for ( int grade = 0; grade < students; grade++ )
grades[ grade ] = gradesArray[ grade ];
} // end GradeBook constructor
// function to set the course name
void GradeBook::setCourseName( string name )
{
courseName = name; // store the course name
} // end function setCourseName
// function to retrieve the course name
string GradeBook::getCourseName()
{
return courseName;
} // end function getCourseName
// display a welcome message to the GradeBook user
void GradeBook::displayMessage()
{
// this statement calls getCourseName to get the
// name of the course this GradeBook represents
cout } // end function displayMessage
// perform various operations on the data
void GradeBook::processGrades()
{
// output grades array
outputGrades();
// call function getAverage to calculate the average grade
cout getAverage()
// call functions getMinimum and getMaximum
cout
// call function outputBarChart to print grade distribution chart
outputBarChart();
} // end function processGrades
// find minimum grade
int GradeBook::getMinimum()
{
int lowGrade = 100; // assume lowest grade is 100
// loop through grades array
for ( int grade = 0; grade < students; grade++ )
{
// if current grade lower than lowGrade, assign it to lowGrade
if ( grades[ grade ] < lowGrade )
lowGrade = grades[ grade ]; // new lowest grade
} // end for
return lowGrade; // return lowest grade
} // end function getMinimum
// find maximum grade
int GradeBook::getMaximum()
{
int highGrade = 0; // assume highest grade is 0
// loop through grades array
for ( int grade = 0; grade < students; grade++ )
{
// if current grade higher than highGrade, assign it to highGrade
if ( grades[ grade ] > highGrade )
highGrade = grades[ grade ]; // new highest grade
} // end for
return highGrade; // return highest grade
} // end function getMaximum
// determine average grade for test
double GradeBook::getAverage()
{
int total = 0; // initialize total
// sum grades in array
for ( int grade = 0; grade < students; grade++ )
total += grades[ grade ];
// return average of grades
return static_cast< double >( total ) / students;
} // end function getAverage
// output bar chart displaying grade distribution
void GradeBook::outputBarChart()
{
cout
// stores frequency of grades in each range of 10 grades
const int frequencySize = 11;
int frequency[ frequencySize ] = {}; // initialize elements to 0
// for each grade, increment the appropriate frequency
for ( int grade = 0; grade < students; grade++ )
frequency[ grades[ grade ] / 10 ]++;
// for each grade frequency, print bar in chart
for ( int count = 0; count < frequencySize; count++ )
{
// output bar labels ("0-9:", ..., "90-99:", "100:" )
if ( count == 0 )
cout else if ( count == 10 )
cout else
cout
// print bar of asterisks
for ( int stars = 0; stars < frequency[ count ]; stars++ )
cout
cout } // end outer for
} // end function outputBarChart
// output the contents of the grades array
void GradeBook::outputGrades()
{
cout
// output each student's grade
for ( int student = 0; student < students; student++ )
cout } // end function outputGrades
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* *
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