| # | Problem | Pass Rate (passed user / total user) |
|---|---|---|
| 14183 | EE2310_Lab12-1 |
|
| 14184 | EE2310_Lab12-2 |
|
Description
#include <iostream>
#include <string>
using namespace std;
class GeometricObject {
public:
GeometricObject();
GeometricObject(const string& color, bool filled);
string toString() const;
/* overload the << operator. Google "stream insertion operator" */
/* declare member variables as 'protected' */
};
/*
* Implement GeometricObject's member/friend functions
*
*/
//-------------------------------------
class Circle: public GeometricObject {
public:
/*
* Remove all access functions
* Declare your constructors
* Overload the stream insertion operator <<
*/
private:
double radius;
};
/*
* Implement Circle's member/friend functions
*
*/
//-------------------------------------
class Rectangle: public GeometricObject {
public:
/*
* Do the same things for Circle
*
*/
private:
double width;
double height;
};
/*
* Do the same things for Circle
*
*/
/* Do not change main(), or you will lose points */
int main() {
GeometricObject shape("Red", true);
Circle circle(5, "black", false);
Rectangle rectangle(2, 3, "orange", true);
cout << shape << circle << rectangle;
}
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Output
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Description
Modify your GeometricObject class definition
Define and implement its constructors well so that the main function works.
Define the toString() function as a virtual function.
Modify your Rectangle class. Define its toString() as a virtual function, too.
Define another class as follows.
class Square: public Rectangle {
public:
Square();
Square(double, const string& , bool);
virtual string toString() const;
};
/*
* Implement its member functions.
*
*/
//-------------------------------------
// Do not change anything below this line, or you will lose points
//-------------------------------------
void displayByValue(const GeometricObject g) {
cout << g.toString() << endl;
}
void displayByReference(const GeometricObject &g) {
cout << g.toString() << endl;
}
void displayByPointer(GeometricObject *ptr_g) {
cout << ptr_g->toString() << endl;
}
int main() {
GeometricObject shape("Red", true);
Rectangle rectangle(2, 3, "orange", true);
Square square(4, "blue", false);
displayByValue(square);
displayByReference(square);
displayByPointer(&square);
return 0;
}