Přetížení operátoru << – C / C++ – Fórum – Programujte.com

Ach jo jsem tu zas, tohle je fakt krize. Přetížit operátor << umim, a pro jistotu sem to kontroloval i podle knížky. Ale kompilátor prostě hlásí chybu. Když v main() nic není, je to v pohodě, jakmile tam založím objekt, třeba Stock gastro; hlásí to tu chybu. Pro jistotu to sem házím celý, ale fakt nevim co se mu nelíbí ani cot o píše za blbosti.

stock2.h:

#ifndef _STOCK2_H_  

#define _STOCK2_H_

class Stock



{

      private:

              char * company;

              int shares;

              double share_val;

              double total_val;

              void set_tot() { total_val = shares * share_val; }

      public:

              Stock();

              Stock(const char * co, int n, double pr);

              ~Stock() { delete [] company; }

              void buy(int num, double price);

              void sell(int num, double price);

              void update(double price);

              void show() const;

              const Stock & topval(const Stock & s) const;

              friend ostream & operator<<(ostream & os, const Stock & st);

      };

      #endif

#include<iostream>

using namespace std;

#include<cstdlib>

#include<cstring>

#include"stock2.h"



Stock::Stock()

{

              company = new char[11];

              company = "spolecnost";

              shares = 0;

              share_val=0.0;

              total_val=0.0;

}



Stock::Stock(const char * co, int n, double pr)

{

              int len = strlen(co);

              company = new char[len+1];

              strcpy(company, co);

              shares = n;

              share_val = pr;

              set_tot();

}



void Stock::buy(int num, double price)

{

              shares+=num;

              share_val = price;

              set_tot();

}

void Stock::sell(int num, double price)

{

              if(num>shares)

              {

                            cerr<<"Nemuzete prodat vic nez mate!\n";

                            exit(1);

              }

              shares -=num;

              share_val = price;

              set_tot();

}



void Stock::update(double price)

{

              share_val = price;

              set_tot();

}



/* void Stock::show() const

{

     cout << "Spolecnost: " << company 

          << "Pocet akcii: " << shares <<"\n";

     cout << "Cena akcie: $" << share_val

          << "Celkova cena: $"<< total_val << "\n";

} */



const Stock & Stock::topval(const Stock & s) const

{

      if(s.total_val > total_val)

      return s;

      else

      return *this;

}



ostream & operator<<(ostream & os, const Stock & st)

{

        os << st.company;

        return os;

} 

#include <iostream>

#include "stock2.h"



using namespace std;



int main()

{

       

    

    system("PAUSE");

    return 0;

}

#include <iostream>

#include "stock2.h"



using namespace std;



int main()

{

       Stock gastro;

    

    system("PAUSE");

    return 0;

}

2 C:\DATA\C++\mistrovstvi-37.cpp In file included from mistrovstvi-37.cpp
21 C:\DATA\C++\stock2.h ISO C++ forbids declaration of `ostream' with no type
21 C:\DATA\C++\stock2.h `ostream' is neither function nor member function; cannot be declared friend
21 C:\DATA\C++\stock2.h expected `;' before '&' token
C:\DATA\C++\Makefile.win [Build Error] [mistrovstvi-37.o] Error 1

friend std::ostream & operator<<(std::ostream & os, const Stock & st);