Re: simple program does not compile with g++-4.3 but with g++-4.2

[Thomas Maeder]

Emanoil Kotsev <deloptes@yahoo.com> writes:

> Hello, I'm trying to learn a bit more of c++. Unfortunately what was
> working in g++ 4.2 is not working in 4.3 anymore. Why?

The code you give below has never been valid since C++ was stadardized
11 years ago.


> I don't think I'm suppose to be changing my code because of this or
> knowing what somebody did change in the compiler. Perhaps I'm
> missing something like compatibility for 4.3.

You'll have to.


> #include <iostream.h>

This not a C++ header. Do

#include <iostream>
#include <ostream>

instead. <iostream> provides the object cout and <ostream> those
overloads of << which are not member functions.


> int main()
> {
>   cout << "The size of an int is:\t\t" << sizeof(int) << " bytes \n";

Note that cout belongs to namespace std. You either have to add a
using directive or declaration, or (prefered by me), write

  std::cout << "The size of an int is:\t\t" << sizeof(int) << " bytes\n";