How to read input int from keyboard?

[h4ever]

Please see the rest of code on bottom of the thread (I'd forgot to add it here).

Hi, I have this code:
http://paste.ofcode.org/FH7hL4KvqhjVsMj8e3EbpK

And there is this part:

cin >> m; // this expects integer
if (!cin)
   { ... }

The documentation says:
"cin can only process the input from the keyboard once the RETURN key has been pressed. Therefore, even if you request a single character, the extraction from cin will not process the input until the user presses RETURN after the character has been introduced."
http://www.cplusplus.com/doc/tutorial/basic_io/

However, when I press enter, I am still in the console window - even if I type ENTER multiple times, it just creates the paragraphs.

[Catfish666]

You lied!

   MyClass m;
   /*
   Pokud zadáš něco jiného než číslo bude výsledek chybý!
   */
   cout << "Cekam objekt (enter number)" << endl;  
   cin >> m;

But seriously, you input a MyClass object, for which you overloaded operator>>.
I am very sure the problem is in the overload, but it is not defined in the code that you posted.

Show the implementation for:

	  friend std::ostream& operator << (std::ostream &os, MyClass &objekt); 
	  friend std::istream& operator >> (std::istream &is, MyClass &objekt);

[nvrmnd]

maybe you meant

if( !cin >> m ) { ... } else { ... }

Edit no wait,, i'm wrong, i didn't look at the code, i thought m was simply an integer :))

[h4ever]

Sorry, guys, I forgot to send code from myClass.cpp

std::istream& operator >> (std::istream &is, MyClass &objekt)
{
   int cislo;
   is >> cislo; // Využiji již přetížených operátorů pro primitivní datové typy
   objekt.setA(cislo);
   is >> cislo;
   objekt.setB(cislo);
   return is; // Nezapomeňte na tuto drobnost! Jinak nebudete moc dávat operátory za sebe
}

std::ostream& operator << (std::ostream &os, MyClass &objekt)
{
   return (os << objekt.A << objekt.B); // Krátké, že?
}

[Catfish666]

Well clearly it's waiting for the user to give two numbers, not one! Try this:

std::istream& operator >> (std::istream &is, MyClass &objekt)
{
   int cislo;
   std::clog << "Dejte první číslo: ";
   is >> cislo; // Využiji již přetížených operátorů pro primitivní datové typy
   objekt.setA(cislo);
   std::clog << "Dejte druhý číslo: ";
   is >> cislo;
   objekt.setB(cislo);
   return is; // Nezapomeňte na tuto drobnost! Jinak nebudete moc dávat operátory za sebe
}

Otherwise, you could try giving two numbers at the same time, like:

Give numbers: 22 34

[Catfish666]

In addition, do you understand what friendship means (in C++)?

Your operator>> being declared friend of class MyClass means that it can access the private members of the class. So more directly:

std::istream& operator >> (std::istream &is, MyClass &objekt)
{
   std::clog << "Dejte první číslo: ";
   is >> objekt.A;
   std::clog << "Dejte druhý číslo: ";
   is >> objekt.B;
   return is;
}

[h4ever]

Yes, thanks. I have it finished!

HEADERS:

stdafx.h

#include <fstream>
#include <iostream>
#include <conio.h> 

MyClass.h

#include "stdafx.h"
#include "MyClass.h"

std::istream& operator >> (std::istream &is, MyClass &objekt)
{   
   return (is >> objekt.A >> objekt.B); // WE EXPECT 2 INPUTS
}

std::ostream& operator << (std::ostream &os, MyClass &objekt)
{
   return (os << objekt.A << objekt.B); // Krátké, že?
}

CPP:

#include "stdafx.h"
#include "MyClass.h"

using namespace std; // using istream and ostream

int main(void)
{
   MyClass m;
   /*
   Pokud zadáš něco jiného než číslo bude výsledek chybný!
   */
   cout << "Enter 2 numbers: (sumbit with ENTERs)" << endl;  
   cin >> m;
   if (!cin)
   {
     cerr << "Object not loaded! " << endl;
   }
   else
   {
     ofstream f("data.txt");
     if (!f) 
     {
       cerr << "Cannot open data.txt" << endl;
       return -1;
     }
     f << "Entered numbers:" << endl << m;
     cout << "Entered numbers:" << endl << m;
   }
   getch();
   return 0;
}

MyClass.cpp

#include "stdafx.h"
#include "MyClass.h"

std::istream& operator >> (std::istream &is, MyClass &objekt)
{   
   return (is >> objekt.A >> objekt.B); // WE EXPECT 2 INPUTS
}

std::ostream& operator << (std::ostream &os, MyClass &objekt)
{
   return (os << objekt.A << objekt.B);
}