lab7p1

//h
#ifndef                 POLI_H
#define                 POLI_H
#pragma warning(disable : 4996)

#include <iostream>
#include <math.h>

using namespace std;

class Figura
{
    public:
        virtual ~Figura(){}
        virtual float arie()=0;
        virtual void afisare()=0;
};
class Dreptunghi : public Figura
{
    private:
        int x1,y1,x2,y2;
    public:
        Dreptunghi(int x1,int y1,int x2,int y2);
        float arie();
        void afisare();
};
class Cerc : public Figura
{
    private:
        int x,y,r;
    public:
        Cerc(int x, int y, int r);
        float arie();
        void afisare();
};

//Figura *figCuArieMax(Figura **figuri, int n);

class Triunghi : public Figura
{
    private:
        int x1,y1,x2,y2,x3,y3;
    public:
        Triunghi(int x1,int y1,int x2,int y2,int x3,int y3);
        float arie();
        void afisare();
};

#endif

//main

#include"poli.h"

/*
int main(int)
{
    const int n = 3;
    Figura *figuri[n];
    figuri[0] = new Dreptunghi(0,0,2,5);
    figuri[1] = new Dreptunghi(0,0,2,2);
    figuri[2] = new Cerc(0,0,3);
    figuri[2] = new Triunghi(1,4,3);
    Figura *figMax = figCuArieMax(figuri, n);

        cout << " Dintre figurile:"<<endl;

    for(int i=0; i<3; i++)
    {
        cout << i << ". ";
        figuri[i]->afisare();
    }
        cout << endl<<" aria maxima o are:"<<endl;

    figMax->afisare();
    for(int i=0; i<n; i++)
    {
        delete figuri[i];
    }

    return 0;
}*/

int main()
{
    int f;
    Figura *dr = new Dreptunghi(1,2,4,4);
    Figura *cerc = new Cerc(1,1,3);
    Figura *tr = new Triunghi(0,2,7,0,-2,0);
    //urmatoarea linie ar genera eroare:
    //Figura *fig = new Figura();
    dr->afisare();
    cerc->afisare();
    tr->afisare();
    delete dr;
    delete cerc;
    delete tr;

    cin>>f;

    return 0;
}

//dreptunghi.cpp

#include"poli.h"

Dreptunghi::Dreptunghi(int x1, int y1, int x2, int y2)
{
    this->x1 = x1;
    this->y1 = y1;
    this->x2 = x2;
    this->y2 = y2;
}

float Dreptunghi::arie()
{
    return (float)(x2 - x1)*(y2 - y1);
}
void Dreptunghi::afisare()
{
    cout << "Dreptunghi cu coordonatele (" <<x1<<","<<y1<<")-("<<x2<<","<<y2<<"), si aria " << arie()<<endl;
}

//cerc.cpp

#include "poli.h"

Cerc::Cerc(int x, int y, int r)
{
    this->x = x;
    this->y = y;
    this->r = r;
}
float Cerc::arie()
{
    const float PI = 3.14F;
    return PI * r * r;
}
void Cerc::afisare()
{
cout << "Cerc cu coordonatele (" <<x<<","<<y <<"), raza " << r<<" si aria " << arie()<<endl;
}

//triunghi.cxpp

#include "poli.h"

Triunghi::Triunghi(int x1,int y1,int x2,int y2,int x3,int y3)
{
    this->x1 = x1;
    this->y1 = y1;
    this->x2 = x2;
    this->y2 = y2;
    this->x3 = x3;
    this->y3 = y3;
}
void Triunghi::afisare()
{
    cout<<"triunghi cu coordonatele (" <<x1<<","<<y1<<")-("<<x2<<","<<y2<<")-("<<x3<<","<<y3<<"), si aria " << arie()<<endl;
}
float Triunghi::arie()
{
    float p,s;
    float a,b,c;
    a= sqrt((float)(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
    b= sqrt((float)(x2-x3)*(x2-x3)+(y2-y3)*(y2-y3));
    c= sqrt((float)(x1-x3)*(x1-x3)+(y1-y3)*(y1-y3));
    p= (a+b+c)/2;
    s = sqrt(p*(p-a)*(p-b)*(p-c));
    return s;
}