Mengenai Inheritance menghitung luas bangun datar (square, circle, rectangle, oval) dengan menggunakan struktur model pewarisan Multilevel ?
#include
using namespace std;
class BasePoint { //class induk
public:
BasePoint(int px, int py):x(px),y(py) {} //constructor dengan default argument
int x, y; //position
virtual string type() = 0; //default constructor dengan nilai 0 (nol)
virtual void info() {
cout << endl << "figure: " << type() << endl;
cout << "position: x=" << x << ", y=" << y << endl;
}
};
class Figure1P : public BasePoint { // pewarisan bersifat public dari class BasePoint
public:
Figure1P(int px, int py, int r):p1(r),BasePoint(px, py) {} //constructor dengan default argument
int p1;
virtual void info() { //default constructor dengan nilai 0 (nol)
BasePoint::info();
cout << "property 1: p=" << p1 << endl;
}
};
class Square : public Figure1P { // pewarisan bersifat public dari class Figure1P
public:
Square(int px, int py, int r):Figure1P(px, py, r) {}; //constructor dengan default argument
virtual string type() { //default constructor dengan nilai 0 (nol)
return "square";
}
};
class Circle : public Figure1P { // pewarisan bersifat public dari class Figure1P
public:
Circle(int px, int py, int r):Figure1P(px, py, r) {} //constructor dengan default argument
virtual string type() { //default constructor dengan nilai 0 (nol)
return "circle";
}
};
class Figure2P : public Figure1P { // pewarisan bersifat public dari class Figure1P
public:
Figure2P(int px, int py, int w, int h):p2(h),Figure1P(px, py, w) {} //constructor dengan default argument
int p2;
virtual void info() { //default constructor dengan nilai 0 (nol)
Figure1P::info();
cout << "property 2: p=" << p2 << endl;
}
};
class Rectangle : public Figure2P { // pewarisan bersifat public dari class Figure2P
public:
Rectangle(int px, int py, int w, int h):Figure2P(px, py, w, h) {} //constructor dengan default argument
virtual string type() { //default constructor dengan nilai 0 (nol)
return "rectangle";
}
};
class Oval : public Figure2P {
public:
Oval(int px, int py, int w, int h):Figure2P(px, py, w, h) {}; //constructor dengan default argument
virtual string type() { //default constructor dengan nilai 0 (nol)
return "oval";
}
};
void main(void) {
BasePoint **objs = new BasePoint*[5];
// allocate space for 10 BasePoint pointers,
// they may be used to store derived classes
// creating objects
objs[0] = new Circle(7, 6, 55);
objs[1] = new Rectangle(12, 54, 21, 14);
objs[2] = new Square(19, 32, 10);
objs[3] = new Oval(43, 10, 4, 3);
objs[4] = new Square(3, 41, 3);
bool flag=false;
do {
cout<< endl << "We have 5 objects with numbers 0..4" << endl;
cout<<"Enter object number to view information about it " << endl;
cout<< "Enter any other number to quit " << endl;
char onum; // in fact, this is a character, not a number
// this allows user to enter letter and quit...
cin >> onum;
// flag -- user have entered number 0..4
flag = ((onum >= '0')&&(onum <= '4'));
if (flag)
objs[onum-'0']->info();
} while(flag);
// freeing memory
for(int i=0;i<5;i++)
delete objs[i];
delete [] objs;
}
