c++acc

C++ programing error

I am new to C++ programming. So I was trying my luck executing some small programs. I am working on HP-UX which has a compiler whose executable is named aCC.

I am trying to execute a small program

#include <iostream.h>
using namespace std;
class myclass {
public:
    int i, j, k; 
};

int main()
{
    myclass a, b;
    a.i = 100; 
    a.j = 4;
    a.k = a.i * a.j;
    b.k = 12; 
    cout << a.k << " " << b.k;
    return 0;
}

When I compile this it gives me an error:

 > aCC temp.cpp
Error 697: "temp.cpp", line 2 # Only namespace names are valid here.
    using namespace std;
                    ^^^

What exactly is the problem? Is std not considered as a namespace in the aCC compiler or is there some serious drawback with aCC?

If I change the <iostream.h> to <iostream>, I get some more errors added as below.

>aCC temp.cpp
Error 112: "temp.cpp", line 1 # Include file <iostream> not found.
    #include <iostream>
             ^^^^^^^^^^
Error 697: "temp.cpp", line 2 # Only namespace names are valid here.
    using namespace std;
                    ^^^
Error 172: "temp.cpp", line 14 # Undeclared variable 'cout'.
    cout << a.k << " " << b.k;
Solution

  • Which version of aCC are you using? Older versions used a pre-standard STL implemenntation that put everything in the global namespace (i.e. didn't use the std namespace)

    You might also need to use the -AA option when compiling. This tells the compiler to use the newer 2.x version of HP's STL library. 

    >aCC -AA temp.cpp

    And it should always be 

    <iostream>  

<iostream.h>

    is from a pre-standard implementation of the language, though it is usually shipped so as to maintain backwards compatibility with older code.