Lab 15_2_19_D

#include <iostream>
#include <cstdlib>
#include <sstream>
#include <typeinfo>
#define DIM 50
using namespace std;

class A{
private:
    int *ptr;
    short len;
public:
    A(short m, short k){
        ptr=new int[m];
        for(short i=0; i<m; i++)
            ptr[i]=rand()%k+1;
        this->len=m;
    }

    virtual double f()=0;

    int get(short i){return this->ptr[i%len];}

    short getLen(){return this->len;}

    virtual ostream &put(ostream &s){
        stringstream ss;
        ss<<", ptr=[ ";
        for(short i=0; i<getLen(); i++)
            ss<<get(i)<<" ";
        ss<<"]";
        return s<<ss.str();
    }

    int &operator[](short k){return ptr[k%len];}
};

class B: public A{
private:
    double p;
public:
    B(short m, short k, double y): A(m,k), p(y){}

    double f(){
        int somma=0;
        for(short i=0; i<getLen(); i++)
            if(get(i)%2==0)
                somma+=get(i);
        return somma/p;
    }

    ostream &put(ostream &s){
        A::put(s);
        return s<<", p="<<p;
    }
};

class C: public A{
private:
    char x;
public:
    C(short n, short k, char c): A(n,k), x(c){}

    double f(){
        double avg=0;
        short counter=0;
        for(short i=0; i<getLen(); i++)
            if(get(i)%2!=0){
                avg+=get(i);
                counter++;
            }
        if(counter==0)
            return 0;
        else
            return avg/counter;
    }

    string g(char c){
        stringstream ss;
        ss<<x<<c;
        return ss.str();
    }

    ostream &put(ostream &s){
        A::put(s);
        return s<<", x="<<x;
    }
};

ostream &operator<<(ostream &s, A &a){
    if(typeid(a)==typeid(B))
        s<<"1B";
    else if(typeid(a)==typeid(C))
        s<<"1C";
    return a.put(s);
}

int main()
{
    srand(111222333);
    A *vett[DIM];

    for(int i=0; i<DIM; i++){
        short n=1+rand()%10;
        short m = 1+rand()%8;
        if(rand()%2==0)
            vett[i]= new B(n, m, rand()/(double) RAND_MAX+0.05);
        else
            vett[i]= new C(n, m, (char) (rand()%('z' - 'a' + 1) + 'a'));
    }

    cout<<"PUNTO 1:"<<endl;
    for(int i=0; i<DIM; i++)
        cout<<i<<")"<<*vett[i]<<", f()="<<vett[i]->f()<<endl;

    cout<<endl<<"PUNTO 2:"<<endl;
    double avg=0;
    stringstream conc;
    C *ptr;
    for(int i=0; i<DIM; i++){
        avg+=vett[i]->f();
        if((ptr=dynamic_cast<C*>(vett[i]))!=NULL)
            conc<<ptr->g('h');
    }
    cout<<"AVG="<<avg/DIM<<", CONC="<<conc.str()<<endl;

    cout<<endl<<"PUNTO 3:"<<endl;
    cout<<*vett[0]<<endl;
    (*vett[0])[1]=100;
    cout<<"(*vett[0])[1]=100"<<endl;
    cout<<*vett[0]<<endl;
    return 0;
}