Notes

#include <iostream>

using namespace std;

int main()
{
double sum = 0;
int number = 0;
int quantity;
while (number != -1)
{
cout << "Enter product number and quantity sold for next product (-1 0 to exit): ";
cin >> number >> quantity;
switch (number)
{
case 1:
sum += 2.98 * quantity;
break;
case 2:
sum += 4.50 * quantity;
break;
case 3:
sum += 9.98 * quantity;
break;
case 4:
sum += 4.49 * quantity;
break;
case 5:
sum += 6.87 * quantity;
break;
}
}
cout << "Total value is: " << sum << endl;
}

---

#include <iostream>
#include "GradeBook.h" // include definition of class GradeBook
using namespace std;

// constructor initializes courseName with string supplied as argument;
// initializes counter data members to 0
GradeBook::GradeBook( string name )
{
setCourseName( name ); // validate and store courseName
aCount = 0; // initialize count of A grades to 0
bCount = 0; // initialize count of B grades to 0
cCount = 0; // initialize count of C grades to 0
dCount = 0; // initialize count of D grades to 0
fCount = 0; // initialize count of F grades to 0
} // end GradeBook constructor

// function to set the course name; limits name to 25 or fewer characters
void GradeBook::setCourseName( string name )
{
if ( name.length() <= 25 ) // if name has 25 or fewer characters
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 << "Name "" << name << "" exceeds maximum length (25).n"
<< "Limiting courseName to first 25 characters.n" << endl;
} // 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()
{
// this statement calls getCourseName to get the
// name of the course this GradeBook represents
cout << "Welcome to the grade book forn" << getCourseName() << "!n"
<< endl;
} // end function displayMessage

// input arbitrary number of grades from user; update grade counter
void GradeBook::inputGrades()
{
int grade; // grade entered by user

cout << "Enter the letter grades." << endl
<< "Enter the EOF character to end input." << endl;

// loop until user types end-of-file key sequence
while ( ( grade = cin.get() ) != EOF )
{
// determine which grade was entered
switch ( grade ) // switch statement nested in while
{
case 'A': // grade was uppercase A
case 'a': // or lowercase a
++aCount; // increment aCount
break; // necessary to exit switch

case 'B': // grade was uppercase B
case 'b': // or lowercase b
++bCount; // increment bCount
break; // exit switch

case 'C': // grade was uppercase C
case 'c': // or lowercase c
++cCount; // increment cCount
break; // exit switch

case 'D': // grade was uppercase D
case 'd': // or lowercase d
++dCount; // increment dCount
break; // exit switch

case 'F': // grade was uppercase F
case 'f': // or lowercase f
++fCount; // increment fCount
break; // exit switch

case 'n': // ignore newlines,
case 't': // tabs,
case ' ': // and spaces in input
break; // exit switch

default: // catch all other characters
cout << "Incorrect letter grade entered."
<< " Enter a new grade." << endl;
break; // optional; will exit switch anyway
} // end switch
} // end while
} // end function inputGrades

// display a report based on the grades entered by user
void GradeBook::displayGradeReport()
{
// output summary of results
cout << "nnNumber of students who received each letter grade:"
<< "nA: " << aCount // display number of A grades
<< "nB: " << bCount // display number of B grades
<< "nC: " << cCount // display number of C grades
<< "nD: " << dCount // display number of D grades
<< "nF: " << fCount // display number of F grades
<< "nGrade-point average: " << static_cast<double>((aCount * 4 + bCount * 3 + cCount*2 + dCount))
/ (aCount + bCount + cCount + dCount + fCount)
<< endl;
} // end function displayGradeReport

---

#include <string> // program uses C++ standard string class
using namespace std;

// GradeBook class definition
class GradeBook
{
public:
GradeBook( string ); // constructor initializes course name
void setCourseName( string ); // function to set the course name
string getCourseName(); // function to retrieve the course name
void displayMessage(); // display a welcome message
void inputGrades(); // input arbitrary number of grades from user
void displayGradeReport(); // display a report based on the grades
private:
string courseName; // course name for this GradeBook
int aCount; // count of A grades
int bCount; // count of B grades
int cCount; // count of C grades
int dCount; // count of D grades
int fCount; // count of F grades
}; // end class GradeBook

---

#include "GradeBook.h" // include definition of class GradeBook

int main()
{
// create GradeBook object
GradeBook myGradeBook( "CS101 C++ Programming" );

myGradeBook.displayMessage(); // display welcome message
myGradeBook.inputGrades(); // read grades from user
myGradeBook.displayGradeReport(); // display report based on grades
} // end main