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Learning Objectives. Review of the object oriented design goals. Review of C++ classes data members member functions (methods) constructors destructors. C++ Classes. Classes enable programmers to model objects that have attributes (data members) and

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learning objectives
Learning Objectives
  • Review of the object oriented design goals.
  • Review of C++ classes
    • data members
    • member functions (methods)
    • constructors
    • destructors

CPSC 231 C++ Review

c classes
C++ Classes
  • Classes enable programmers to model objects that have
      • attributes (data members) and
      • behaviors (member functions or methods)
  • Once a class has been defined, the class name can be used to declare objects of that class.

CPSC 231 C++ Review

a simple c class
A Simple C++ Class

#include <iostream.h>

// ------------ a Box class

class Box {

private:

int height, width, depth; // private data members

public:

Box(int, int, int); // constructor function

~Box(); // destructor function

int volume(); // member function (computev olume)

};

CPSC 231 C++ Review

class box
Class Box

---------- the constructor function

Box::Box(int ht=0, int wd=0, int dp=0)

{

height = ht;

width = wd;

depth = dp;

}

// ---------- the destructor function

Box::~Box()

{

// does nothing

}

//

CPSC 231 C++ Review

class box cont
Class Box cont.

// -------- member function to compute the Box\'s volume

int Box::volume()

{

return height * width * depth;

}

// -------- an application to use the box

int main()

{

Box b, thisbox(7,8,9); // declare a Box

cout <<b.volume()<<\' \'<<thisbox.volume(); // compute & display

return 0;

}

CPSC 231 C++ Review

example of a salesperson class
Example of a SalesPerson Class

// salesp.h p 384 of D&D

// SalesPerson class definition

// Member functions defined in salesp.cpp

#ifndef SALESP_H

#define SALESP_H

class SalesPerson {

public:

SalesPerson(); // constructor

void getSalesFromUser(); // get sales figures from keyboard

void setSales( int, double ); // user supplies data

void printAnnualSales();

CPSC 231 C++ Review

salesperson class definition cont
SalesPerson class definition cont.

private:

double totalAnnualSales(); // utility function

double sales[ 12 ]; // 12 monthly sales figures

};

#endif

CPSC 231 C++ Review

member functions for class salesperson
Member Functions for Class SalesPerson

// salesp.cpp

// Member functions for class SalesPerson

#include <iostream.h>

#include <iomanip.h>

#include "salesp.h"

// Constructor function initializes array

SalesPerson::SalesPerson()

{

for ( int i = 0; i < 12; i++ )

sales[ i ] = 0.0;

}

CPSC 231 C++ Review

get function getsalesfromuser
“get” function getSalesFromUser

// Function to get 12 sales figures from the user

// at the keyboard

void SalesPerson::getSalesFromUser()

{

double salesFigure;

for ( int i = 0; i < 12; i++ ) {

cout << "Enter sales amount for month "

<< i + 1 << ": ";

cin >> salesFigure;

setSales( i, salesFigure );

}

}

CPSC 231 C++ Review

set function setsales
“set” function setSales

// Function to set one of the 12 monthly sales figures.

// Note that the month value must be from 0 to 11.

void SalesPerson::setSales( int month, double amount )

{

if ( month >= 0 && month < 12 && amount > 0 )

sales[ month ] = amount;

else

cout << "Invalid month or sales figure" << endl;

}

CPSC 231 C++ Review

print function printannualsales
“print” function printAnnualSales

// Print the total annual sales

void SalesPerson::printAnnualSales()

{

cout << setprecision( 2 )

<< setiosflags( ios::fixed | ios::showpoint )

<< "\nThe total annual sales are: $"

<< totalAnnualSales() << endl;

}

CPSC 231 C++ Review

utility function totalannualsales
“utility” function totalAnnualSales

// Private utility function to total annual sales

double SalesPerson::totalAnnualSales()

{

double total = 0.0;

for ( int i = 0; i < 12; i++ )

total += sales[ i ];

return total;

}

CPSC 231 C++ Review

sample driver
Sample driver

// Compile with salesp.cpp

#include <iostream.h>

#include "salesp.h"

int main()

{

SalesPerson s; // create SalesPerson object s

s.getSalesFromUser(); // note simple sequential code

s.printAnnualSales(); // no control structures in main

return 0;

}

CPSC 231 C++ Review

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