Shapes

#include <iostream>
#include <cmath>
using namespace std;


//TODO: konstruiraj ja abstraknata klasa Shape
class Shape{
protected:
    int a;
public:
    Shape(){}
    Shape(int a){
    this->a=a;
    }
    virtual double plostina() {}
    virtual void pecati() {}
    virtual int getType() {}
};
//TODO: konstruiraj ja klasata Kvadrat
class Square : public Shape{
public:
    Square(int a) : Shape(a){}
    double plostina(){
    return (double)a*a;
    }
    void pecati(){
    cout<<"Kvadrat so plostina = "<<plostina()<<endl;
    }
    int getType(){
    return 1;
    }
};
//TODO: konstruiraj ja klasata Krug
class Krug : public Shape{
public:
    Krug(int a) : Shape(a){}
    double plostina(){
    return 3.14 * a * a;
    }
    void pecati(){
     cout<<"Krug so plostina = "<<plostina()<<endl;
    }
    int getType(){
    return 2;
    }
};
//TODO: konstruiraj ja klasata Triagolnik
class Triagolnik : public Shape{
public:
    Triagolnik(int a) : Shape(a){}
    double plostina(){
    return (sqrt(3)/4) * (double)a * a;
    }
    void pecati(){
     cout<<"Triagolnik so plostina = "<<plostina()<<endl;
    }
    int getType(){
    return 3;
    }
};

//TODO: definiraj go metodot void checkNumTypes(Shape** niza, int n)
void checkNumTypes(Shape** niza, int n){
int square=0, krug=0, triagolnik=0;
   for(int i=0;i<n;++i){
    if(niza[i]->getType()==1)
       square++;
    if(niza[i]->getType()==2)
       krug++;
    if(niza[i]->getType()==3)
       triagolnik++;
       }
    cout<<"Broj na kvadrati vo nizata = "<<square<<endl;
    cout<<"Broj na krugovi vo nizata = "<<krug<<endl;
    cout<<"Broj na triagolnici vo nizata = "<<triagolnik<<endl;
}

int main(){


    int n;
    cin >> n;

    //TODO: inicijaliziraj niza od pokazuvachi kon klasata Shape
    Shape **niza;


    //TODO: alociraj memorija so golemina n za prethodno navedenata niza
    niza=new Shape*[50];

    int classType;
    int side;

    //TODO: konstruiraj for ciklus so chija pomosh ke ja popolnish nizata
    for(int i = 0; i < n; ++i){

        cin >> classType;
        cin >> side;
        if(classType==1)
        niza[i]=new Square(side);
        if(classType==2)
           niza[i]=new Krug(side);
        if(classType==3)
            niza[i]=new Triagolnik(side);
    }

for(int i = 0; i < n; ++i){

        niza[i]->pecati();
    }

    checkNumTypes(niza, n);

    return 0;
}