11,1 Obyektga mo‘ljallangan yondashuv tarixi

Base() {cout«"Base sinfi konstruktori \n";}
~Base() {cout«"Base sinfi destruktori \n";}
};
class Derived: public Base {
public:
Derived() {cout«"Derived sinfi konstruktori \n";}
~Derived() {cout«"Derived sinfi destruktori \n ;}
};
int main ()
{
Derived d; return 0;
}
Natija:
Base sinfi konstruktori Derived sinfi konstruktori Derived sinfi destruktori Base sinfi destruktori
Quyida keltirilgan dasturda ikkita oddiy geometrik obyekt - doira va silindrning sinflar tabaqalanishi e'lon qilingan.
Dastur shunday tuzilganki, bunda doiraning r — radiusi va silindrning h - balandligi o'zgaruvchilarining ichki qiymatlari yaratilayotgan obyektlar parametrlarini aniqlashi kerak. Circle bazaviy sinfi doirani modellashti- radi, Cylinder hosila sinfi esa silindrni modellashtiradi.
#include < iostream.h>
#include
const double pi=4 * atan(l);
class Circle {
protected:
double r;
public:
Circle (double rVal=0): r(rVal) {} void setRadius(double rVal) {r=rVal;}; double getRadius() {return r;}; double Area() {return pi*r*r;}; void showData();
};
class Cylinder: public Circle {
protected:
double h;
public:
Cylinder(double hVal=0, double rVal = 0)