// Fig. 4.10: GradeBook.cpp
// Member-function definitions for class GradeBook that solves the
// class average program with sentinel-controlled repetition.
#include
using std::cout;
using std::cin;
using std::endl;
using std::fixed; // ensures that decimal point is displayed
#include // parameterized stream manipulators
using std::setprecision; // sets numeric output precision
// include definition of class GradeBook from GradeBook.h
#include "GradeBook.h"
// constructor initializes courseName with string supplied as argument
GradeBook::GradeBook( string name )
{
setCourseName( name ); // validate and store courseName
} // end GradeBook constructor
// function to set the course name;
// ensures that the course name has at most 25 characters
void GradeBook::setCourseName( string name )
{
if ( name.length() courseName = name; // store the course name in the object
else // if name is longer than 25 characters
{ // set courseName to first 25 characters of parameter name
courseName = name.substr( 0, 25 ); // select first 25 characters
cout } // end if...else
} // 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()
{
cout } // end function displayMessage
// determine class average based on 10 grades entered by user
void GradeBook::determineClassAverage()
{
int total; // sum of grades entered by user
int gradeCounter; // number of grades entered
int grade; // grade value
double average; // number with decimal point for average
// initialization phase
total = 0; // initialize total
gradeCounter = 0; // initialize loop counter
// processing phase
// prompt for input and read grade from user
cout cin >> grade; // input grade or sentinel value
// loop until sentinel value read from user
while ( grade != -1 ) // while grade is not -1
{
total = total + grade; // add grade to total
gradeCounter = gradeCounter + 1; // increment counter
// prompt for input and read next grade from user
cout cin >> grade; // input grade or sentinel value
} // end while
// termination phase
if ( gradeCounter != 0 ) // if user entered at least one grade...
{
// calculate average of all grades entered
average = static_cast< double >( total ) / gradeCounter;
// display total and average (with two digits of precision)
cout cout } // end if
else // no grades were entered, so output appropriate message
cout } // end function determineClassAverage
/**************************************************************************
* (C) Copyright 1992-2009 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
**************************************************************************/
