1. Shape.h Shape Point Circle Cylinder // SHAPE.H
// Definition of abstract base class Shape
#ifndef SHAPE_H
#define SHAPE_H
class Shape {
public:
virtual float area() const { return 0.0; }
virtual float volume() const { return 0.0; }
virtual void printShapeName() const = 0; // pure virtual
virtual void print() const = 0; // pure virtual };
#endif
Shape
Point
Circle
Cylinder
C++ Review
EECE 352

2. Topics Inheritance Syntax. What does it mean to inherit.
Types (public, private, protected).
Overriding member functions (virtual keyword).
Operator overloading.
Friend functions.
Constructors can call parent constructors.
Destructors are called in order of child to parent.
C++ Review
EECE 352

3. Point1.h // POINT1.H // Definition of class Point #ifndef POINT1_H
#define POINT1_H
#include <iostream.h>
#include "shape.h"
class Point : public Shape {
friend ostream &operator<<(ostream &, const Point &);
public:
Point(float = 0, float = 0); // default constructor
void setPoint(float, float);
float getX() const { return x; }
float getY() const { return y; }
virtual void printShapeName() const { cout << "Point: "; }
virtual void print() const;
private:
float x, y; // x and y coordinates of Point };
#endif
C++ Review
EECE 352

4. Point1.cpp
// POINT1.CPP
// Member function definitions for class Point
#include <iostream.h>
#include "point1.h"
Point::Point(float a, float b) {
setPoint(a, b); }
void Point::setPoint(float a, float b) {
x = a;
y = b; }
void Point::print() const { cout << '[' << x << ", " << y << ']'; }
ostream &operator<<(ostream &output, const Point &p)
p.print(); // call print to output the object
return output; // enables concatenated calls
C++ Review
EECE 352

5. Circle.h // CIRCLE1.H // Definition of class Circle #ifndef CIRCLE1_H
#define CIRCLE1_H
#include "point1.h"
class Circle : public Point {
friend ostream &operator<<(ostream &, const Circle &);
public:
// default constructor
Circle(float r = 0.0, float x = 0.0, float y = 0.0);
void setRadius(float);
float getRadius() const;
virtual float area() const;
virtual void printShapeName() const { cout << "Circle: "; }
virtual void print() const;
private:
float radius; // radius of Circle };
#endif
C++ Review
EECE 352

6. Circle.cpp // CIRCLE1.CPP
// Member function definitions for class Circle
#include <iostream.h>
#include <iomanip.h>
#include "circle1.h"
Circle::Circle(float r, float a, float b)
: Point(a, b) // call base-class constructor
{ radius = r > 0 ? r : 0; }
void Circle::setRadius(float r) { radius = r > 0 ? r : 0; }
float Circle::getRadius() const { return radius; }
float Circle::area() const { return * radius * radius; }
void Circle::print() const {
cout << '[' << getX() << ", " << getY()
<< "]; Radius=" << setiosflags(ios::showpoint)
<< setprecision(2) << radius; }
ostream &operator<<(ostream &output, const Circle &c){
c.print(); // call print to output the object
return output; // enables concatenated calls
C++ Review
EECE 352

7. Cylindr1.h // CYLINDR1.H // Definition of class Cylinder
#ifndef CYLINDR1_H
#define CYLINDR1_H
#include "circle1.h"
class Cylinder : public Circle {
friend ostream &operator<<(ostream &, const Cylinder &);
public:
// default constructor
Cylinder(float h = 0.0, float r = 0.0,
float x = 0.0, float y = 0.0);
void setHeight(float);
virtual float area() const;
virtual float volume() const;
virtual void printShapeName() const { cout << "Cylinder: "; }
virtual void print() const;
private:
float height; // height of Cylinder };
#endif
C++ Review
EECE 352

8. Cylindr1.cpp #include <iostream.h> #include <iomanip.h>
#include "cylindr1.h"
Cylinder::Cylinder(float h, float r, float x, float y)
: Circle(r, x, y) // call base-class constructor
{ height = h > 0 ? h : 0; }
void Cylinder::setHeight(float h) { height = h > 0 ? h : 0; }
float Cylinder::area() const{ // surface area of Cylinder
return 2 * Circle::area() +
2 * * Circle::getRadius() * height; }
float Cylinder::volume() const { return Circle::area() * height; }
void Cylinder::print() const {
cout << '[' << getX() << ", " << getY()
<< "]; Radius=" << setiosflags(ios::showpoint)
<< setprecision(2) << getRadius()
<< "; Height=" << height;
ostream &operator<<(ostream &output, const Cylinder& c) {
c.print(); // call print to output the object
return output; // enables concatenated calls
C++ Review
EECE 352

9. Main main() { Point point(7, 11); // create a Point
Circle circle(3.5, 22, 8); // create a Circle
Cylinder cylinder(10, 3.3, 10, 10); // create a Cylinder
point.printShapeName(); // static binding
cout << point << endl;
circle.printShapeName(); // static binding
cout << circle << endl;
cylinder.printShapeName(); // static binding
cout << cylinder << "\n\n";
cout << setiosflags(ios::showpoint) << setprecision(2);
Shape *arrayOfShapes[3]; // array of base-class pointers
arrayOfShapes[0] = &point;
arrayOfShapes[1] = &circle;
arrayOfShapes[2] = &cylinder;
for (int i = 0; i < 3; i++) {
arrayOfShapes[i]->printShapeName();
cout << endl;
arrayOfShapes[i]->print();
cout << "\nArea = " << arrayOfShapes[i]->area()
<< "\nVolume = " << arrayOfShapes[i]->volume()
<< endl << endl;}
return 0; }
C++ Review
EECE 352