Error in compiling

This is a discussion on Error in compiling within the C++ Programming forums, part of the General Programming Boards category; I try compile this: Code: #include <iostream.h> int main() { cout << "Hello World!\n"; return 0; } but when try ...

  1. #1
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    Error in compiling

    I try compile this:
    Code:
    #include <iostream.h>
    
    int main()
    {
      cout << "Hello World!\n";
      return 0;
    }
    but when try compile i get:
    In file included from /usr/include/c++/3.2/backward/iostream.h:31,
    from 11.cpp:1:
    /usr/include/c++/3.2/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <sstream> instead of the deprecated header <strstream.h>. To disable this warning use -Wno-deprecated.
    why? THe program is being compile and work fine but why this erro?

  2. #2
    Sweet
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    because you are using an old header just use <iostream> instead. After that put using namespace std;
    Woop?

  3. #3
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    THe book i use learn C++ in 21 days, says iostream.h, can't i find a book thatwill tell them right?
    i edit iostream and no i get errors too
    these erros:
    11.cpp: In function `int main()':
    11.cpp:5: `cout' undeclared (first use this function)
    11.cpp:5: (Each undeclared identifier is reported only once for each function it appears in.)
    thanks

  4. #4
    Registered User Kybo_Ren's Avatar
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    Please read his response.

    He told you to put
    Code:
    using namespace std;
    after the #include part.
    The reason you got that error was because cout was not qualified.

    You can have a few different styles to it:
    Code:
    //Method 1
    #include <iostream>
    using namespace std;//qualifies all names to be in namespace std
    
    int main()
    {
        cout << "Hello, World!" << endl;
        return 0;
    }
    Code:
    //Method 2
    #include <iostream>
    using std::cout;
    using std::endl;//pre-qualifies cout and endl
    
    int main()
    {
        cout << "Hello, World!" << endl;
        return 0;
    }
    Code:
    //Method 3
    #include <iostream>
    
    int main()
    {
        std::cout << "Hello, World!" << std::endl;//inline qualification
        return 0;
    }
    I've heard people argue that method one is not the best to use, because it defeats the whole purpose of having a namespace, but I use it anyway (and just put using namespace ____ when I need to use a different namespace).

  5. #5
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    The book doesn't say that

  6. #6
    Its not rocket science vasanth's Avatar
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    thats because the book is old and it does not use the latest standard..

  7. #7
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    hell.
    where can i find the latest standard tutor? or book

  8. #8
    Its not rocket science vasanth's Avatar
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    you can get the latest book in a book store I assume..

  9. #9
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    not here in Greece!
    in ineternet?

  10. #10
    Its not rocket science vasanth's Avatar
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    If you had searched the board a little you would have found 100's of threads which discuss abt e-book's tutorials etc to help beginners in C/C++

    C++ e-book for free

  11. #11
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    thanks

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