#include <iostream>
#include <cmath>

using namespace std;

class Trokut
    {
        //!enkapsulacia -pristupprivatnim svoistvima variable
        //!metodama je omogucen pristup izvana pa je potrebno naporaviti javnob vsucelje
    private:
        double a,b,c;
    public:
        Trokut()    //!konstruktor poziva se kod kreiranja objekta, MOŽE SE i preskocit
        {
            //!moze vise konstruktora vali razliciti tipovi argumenata
            a=0;
            b=0;
            c=0;
        }

        Trokut(double a,double b,double c)
        {
            set_a(a);
            set_b(b);
            set_c(c);
        }


        double get_a()
        {
            return a;
        }

        double get_b()
        {
            return b;
        }

        double get_c()
        {
            return c;
        }

        //!imam dvievariable koie se zovu isto

        void set_a(double a)
        {
            if(a>=0)
            this ->a=a;
            else
                cout<<"ne moze"<<endl;
                 //!oznacavasvoistvo klase
        }

        void set_b(double b)
        {
            if(b>=0)

            this ->b=b;
            else
                cout<<"ne moze"<<endl;     //!oznacavasvoistvo klase
        }

        void set_c(double c)
        {
            if(c>=0)

            this ->c=c;
            else
                cout<<"ne moze"<<endl;     //!oznacavasvoistvo klase
        }

        double opseg()
        {
            return a+b+c;
        }

        double povrsina()
        {
            double s=opseg()/2;
            return sqrt(s*(s-a)*(s-b)*(s-c));


        }

    };

int main()
{
    Trokut bermudski;
    cout<<"a= "<<bermudski.get_a()<<endl;
    cout<<"b= "<<bermudski.get_b()<<endl;
    cout<<"c= "<<bermudski.get_c()<<endl;

    bermudski.set_a(30);
    bermudski.set_b(40);
    bermudski.set_c(50);

    cout<<"a= "<<bermudski.get_a()<<endl;
    cout<<"b= "<<bermudski.get_b()<<endl;
    cout<<"c= "<<bermudski.get_c()<<endl;
    //!moramo onemogucit krivo postavljanje duzina stranica

    bermudski.set_a(-20);

    //!mozemo omoguciti i drugacie konstruktore
    Trokut pitagorin(6,8,10);
    cout<<"a= "<<bermudski.get_a()<<endl;
    cout<<"b= "<<bermudski.get_b()<<endl;
    cout<<"c= "<<bermudski.get_c()<<endl;




    return 0;
}