Does my c++ compiler have a bug???

ashesh · 06-10-2003, 05:20 AM

I have got Linux RH8.0...

I have written the following code:

#include <iostream>

int main()
{
int x;
cout << "Hello World" << endl;
cin>>x;
cout<<" X = "<<x<<"\n";
}

It gives error on my systemsaying the C++/3.2/iostream file has some problem etc...
This program worked well on a system with RH7.1

Someone suggested to have
"using namespace std" after the include statement and the program works well.

I am still confused why I have done this and whether there is some real problem with my compiler?

I dont know how I can know what my compiler is?

fancypiper · 06-10-2003, 08:05 AM

I can answer the last question

# What compiler version do I have
gcc --version

Mara · 06-10-2003, 12:36 PM

If you use
#include <iostream.h>
It should be OK (but not 100% sure).

wapcaplet · 06-10-2003, 01:26 PM

Leave it as:

Code:

#include <iostream>
using namespace std;

There is nothing wrong with your compiler. This is the way it's supposed to be done nowadays

Check out the following threads; this question has been asked many times here:

http://www.linuxquestions.org/questi...threadid=48417
http://www.linuxquestions.org/questi...threadid=43963

jrpretz · 06-10-2003, 02:01 PM

You can
#include <iostream.h>
and avoid the
using namespace std;

but the compiler complains that iostream.h is deprecated.

ashesh · 06-10-2003, 11:01 PM

[ashesh@ecl5 ashesh]$ gcc --version
gcc (GCC) 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Yes, the error was because i was not including the
using namepsace std;

and it seems all the new compilers will need the above statement.

Moreover, #include<iostearm.h> doesn't work; it has to be <iostream> and then the "using namespace std;"

GtkUser · 06-11-2003, 04:24 AM

Quote:

Originally posted by ashesh
I have got Linux RH8.0...

I have written the following code:

#include <iostream>

int main()
{
int x;
cout << "Hello World" << endl;
cin>>x;
cout<<" X = "<<x<<"\n";
}

It gives error on my systemsaying the C++/3.2/iostream file has some problem etc...
This program worked well on a system with RH7.1

Someone suggested to have
"using namespace std" after the include statement and the program works well.

I am still confused why I have done this and whether there is some real problem with my compiler?

I dont know how I can know what my compiler is?

Code:

#include<iostream>

int main() {
  int x;
  std::cout << "Hello World" << std::endl;
  std::cin >> x;
  std::cout << " X = " << x << std::endl;
  return 0;
}

The standard library classes are contained in a namespace called std.

Code:

#incude<iostream>

using std::cin;
using std::cout;
using std::endl;

int main() {
  int x;
  cout << "Hello World" << endl;
  cin >> x;
  cout << "X = " << x << endl;
  return 0;
}