Deriving one class from another
Ok, yeah, it's homework. Here's the deal, I need to make a class "point", perform operations on the point, like showing the point, setting and printing coordinates, and showing x and y coordinates, then... design a class "circle" that can sotre radius and center and derive "circle" from "point" to perform operations on a circle, like setting radius, printing the radius, calculating and printing the area and circumference and such.
Here is what I've done so far:
circle.cpp
Code:
#include <iostream.h>
#include <math.h>
#include "Circle.h"
void Circle :: read() {
cout << "\nEnter radius of circle: ";
cin >> radius;
cout << "Enter center point of circle:";
Point::read();
}
float Circle :: area() const {
const float pii = 3.14159;
return pii * radius * radius;
}
void Circle :: I_am() const {
cout << "\nI am Circle ";
}
Circle.h
Code:
#ifndef _circle
#define _cicle
#include "point.h"
class Circle : public Point{
private:
float radius;
public:
void read();
float area() const;
virtual void I_am(void) const;
};
#endif
point.cpp
Code:
#include <iostream.h>
#include <math.h>
#include "point.h"
void Point::read() {
cout << "\n Enter x-coordinate of point: ";
cin >> x;
cout << " Enter y-coordinate of point: ";
cin >> y;
}
float Point :: area() const{
return 0.0;
}
void Point :: I_am() const {
cout << "\nI am Point ";
}
float Point::distance(const Point &p2)const{
return sqrt( (p2.x-x)*(p2.x-x) + (p2.y - y)*(p2.y - y));
}
point.h
Code:
#ifndef _point
#define _point
#include "shape.h"
class Point : public Shape {
public:
virtual void read();
virtual float area() const;
virtual float distance(const Point &p2)const;
virtual void I_am() const;
private:
float x;
float y;
};
#endif
Then I wrote an abstract
shape.h
Code:
#ifndef _shape
#define _shape
class Shape {
public:
virtual void read() = 0;
virtual float area()const = 0 ;
virtual void I_am() const = 0;
};
#endif
Now, i'm getting an error:
point.pp
Cannot open include file: 'iostream.h': No such file or directory
circle.cpp
Cannot open include file: 'iostream.h': No such file or directory
Any help is appreciated.
Thanks
