1 / 9

Shape.h

Shape.h. // 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

fonda
Download Presentation

Shape.h

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Shape.h // 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 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. 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 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 } 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 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 3.14159 * 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 } 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 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 * 3.14159 * 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 } 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; } EECE 352

More Related