initial

Makefile

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+all: inh01 inh02 inh03 inh04 inh05 inh06
+
+inh01: inh01.cpp
+	g++ -o inh01 inh01.cpp -std=c++11
+
+inh02: inh02.cpp
+	g++ -o inh02 inh02.cpp -std=c++11
+
+inh03: inh03.cpp
+	g++ -o inh03 inh03.cpp -std=c++11
+
+inh04: inh04.cpp
+	g++ -o inh04 inh04.cpp -std=c++11
+
+inh05: inh05.cpp
+	g++ -o inh05 inh05.cpp -std=c++11
+
+inh06: inh06.cpp
+	g++ -o inh06 inh06.cpp -std=c++11
+

README.md

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+### Examples for inheritance CCOM 3034

inh01.cpp

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+// Example showing a base class (Shape) and a derived 
+// class Rectangle. Notice how Rectangle inherits Shape's
+// display function.
+
+#include <iostream>
+
+using namespace std;
+
+class Shape {
+  protected:
+    int width, height;
+  public:
+    Shape() { width = height = 0; }
+    Shape(int w, int h) { width = w; height = h; }
+    void display() const;
+};
+
+void Shape::display() const {
+  cout << width << " " << height << endl; 
+}
+
+
+class Rectangle : public Shape {
+  public:
+    Rectangle() {}
+    Rectangle(int w, int h) : Shape(w, h) {}
+};
+
+int main() {
+  Rectangle r;
+  Rectangle q(4,5);
+  r.display();
+  q.display();
+  return 0;
+} 

inh02.cpp

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+// We have added a new member function (perimeter) to the 
+// subclass Rectangle. Subclasses can have many more data members
+// and member functions besides the ones they inherit from their
+// base class.
+
+#include <iostream>
+using namespace std;
+
+class Shape {
+  protected:
+    int width, height;
+  public:
+    Shape() { width = height = 0; }
+    Shape(int w, int h) { width = w; height = h; }
+    void display() const;
+};
+
+void Shape::display() const {
+  cout << width << " " << height << endl; 
+}
+
+class Rectangle : public Shape {
+  public:
+    Rectangle() {}
+    Rectangle(int w, int h) : Shape(w, h) { }
+    int perimeter() const;
+};
+
+int Rectangle::perimeter() const{
+  return 2 * width + 2 * height;
+}
+
+int main() {
+  Rectangle r;
+  Rectangle q(4,5);
+  r.display();
+  q.display();
+  cout << "Perimeter of q is: " << q.perimeter() << endl;
+  return 0;
+} 

inh03.cpp

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+// We have overloaded the display function of Rectangle
+
+#include <iostream>
+using namespace std;
+
+class Shape {
+  protected:
+    int width, height;
+  public:
+    Shape() { width = height = 0; }
+    Shape(int w, int h) { width = w; height = h; }
+    void display() const;
+};
+
+void Shape::display() const {
+  cout << width << " " << height << endl; 
+}
+
+class Rectangle : public Shape {
+  public:
+    Rectangle() {}
+    Rectangle(int w, int h) : Shape(w, h) { }
+    int perimeter() const;
+    void display() const;
+};
+
+int Rectangle::perimeter() const{
+  return 2 * width + 2 * height;
+}
+
+void Rectangle::display() const {
+  cout << "I am rectangle of width " << width 
+       << " and height " << height << endl;
+}
+
+int main() {
+  Rectangle r;
+  Rectangle q(4,5);
+  r.display();
+  q.display();
+  cout << "Perimeter of q is: " << q.perimeter() << endl;
+  return 0;
+} 

inh04.cpp

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+// Trying to invoke the display function from a pointer.
+
+#include <iostream>
+using namespace std;
+
+class Shape {
+  protected:
+    int width, height;
+  public:
+    Shape() { width = height = 0; }
+    Shape(int w, int h) { width = w; height = h; }
+    void display() const;
+};
+
+void Shape::display() const {
+  cout << width << " " << height << endl; 
+}
+
+class Rectangle : public Shape {
+  public:
+    Rectangle() {}
+    Rectangle(int w, int h) : Shape(w, h) { }
+    int perimeter() const;
+    void display() const;
+};
+
+int Rectangle::perimeter() const{
+  return 2 * width + 2 * height;
+}
+
+void Rectangle::display() const {
+  cout << "I am rectangle of width " << width 
+       << " and height " << height << endl;
+}
+
+int main() {
+
+    Shape *p;
+    Shape *s;
+    p = new Rectangle(4,8);
+    s = new Shape(3,5);
+
+    s->display();
+    p->display();
+
+  return 0;
+} 

inh05.cpp

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+// Trying to invoke the display function from a pointer, but
+// now display is virtual function.
+
+#include <iostream>
+using namespace std;
+
+class Shape {
+  protected:
+    int width, height;
+  public:
+    Shape() { width = height = 0; }
+    Shape(int w, int h) { width = w; height = h; }
+    virtual void display() const;
+};
+
+void Shape::display() const {
+  cout << width << " " << height << endl; 
+}
+
+class Rectangle : public Shape {
+  public:
+    Rectangle() {}
+    Rectangle(int w, int h) : Shape(w, h) { }
+    int perimeter() const;
+    void display() const;
+};
+
+int Rectangle::perimeter() const{
+  return 2 * width + 2 * height;
+}
+
+void Rectangle::display() const {
+  cout << "I am rectangle of width " << width 
+       << " and height " << height << endl;
+}
+
+class Square: public Rectangle {
+  public:
+    Square() {}
+    Square(int w) : Rectangle(w,w) {}
+    void display() const;
+};
+
+void Square::display() const {
+  cout << "I am square of side " << width << endl;
+}
+
+
+int main() {
+
+    Shape *p;
+    Shape *s;
+    p = new Rectangle(4,8);
+    s = new Shape(3,5);
+
+    s->display();
+    p->display();
+
+    Shape *q = new Square(10);
+    q->display();
+
+  return 0;
+} 

inh06.cpp

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+#include <iostream>
+using namespace std;
+
+class Shape {
+  protected:
+    int width, height;
+  public:
+    Shape() { width = height = 0; }
+    Shape(int w, int h) { width = w; height = h; }
+    virtual void display() const;
+};
+
+void Shape::display() const {
+  cout << width << " " << height << endl; 
+}
+
+class Rectangle : public Shape {
+  public:
+    Rectangle() {}
+    Rectangle(int w, int h) : Shape(w, h) { }
+    int perimeter() const;
+    void display() const;
+};
+
+int Rectangle::perimeter() const{
+  return 2 * width + 2 * height;
+}
+
+void Rectangle::display() const {
+  cout << "I am rectangle of width " << width 
+       << " and height " << height << endl;
+}
+
+class Triangle: public Shape {
+  public:
+    Triangle() {}
+    Triangle(int w, int h) : Shape(w,h) {}
+    void display() const;
+};
+
+void Triangle::display() const {
+  cout << "I am triangle of side " << width << endl;
+}
+
+
+int main() {
+    Shape* a[4];
+    a[0] = new Rectangle(3,4);
+    a[1] = new Triangle(5,7);
+    a[2] = new Rectangle(10,5);
+    a[3] = new Triangle(2,8);
+
+    for (auto e: a) {
+        e->display();
+    }
+}