using namespace std;

This is a discussion on using namespace std; within the C++ Programming forums, part of the General Programming Boards category; is there a header file for namespace or is it just my compiler?...

  1. #1
    Student drdroid's Avatar
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    Question using namespace std;

    is there a header file for namespace or is it just my compiler?

  2. #2
    Evil Member
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    namespace is a keyword, which means it is your compiler.

    Are you sure you are using a C++ compiler and not a C compiler?

  3. #3
    Student drdroid's Avatar
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    ...

    its called borland c++

  4. #4
    &TH of undefined behavior Fordy's Avatar
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    Re: ...

    Originally posted by drdroid
    its called borland c++
    If you have an old version then namspaces will probably not work properly......but as you like borland, you can download the newest version for free from their site and that should support them fine

  5. #5
    Banned Troll_King's Avatar
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    Never use: using namespace std in your programs.

  6. #6
    Refugee face_master's Avatar
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    yeah, I prefer not using it

  7. #7
    Banned Troll_King's Avatar
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    You probably perfer not bathing as well.

  8. #8
    Refugee face_master's Avatar
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    Originally posted by Troll_King
    You probably perfer not bathing as well.
    Damn straight

  9. #9
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    Fordy's suggestion is a good one. Borland 4.0 supports the standard namespace and the download is version 5.5, so you're all set on that issue.

    Now, where Troll_King's admonition is concerned, I would offer this:
    It is generally in poor taste to dump every name from a namespace into the global namespace.

    -Bjarne Stroustrup
    I don't know whether Troll_King is backing Mr. Stroustrup up here, or vice-versa, but the message is clear enough.

    Some might offer, with some validity, that, for smaller applications, 'using namespace std;' isn't so big an issue. Perhaps, but neither is it difficult to avoid using it in small applications, either.
    Code:
    #include <string>
    #include <iostream>
    #include <cstdlib>  // for system("PAUSE")
    
    using std::cout;
    using std::cin;
    using std::endl;
    using std::string;
    
    int main(void)
    {
    string name;
    cout << "Type in your name -> ";
    getline(cin, name);        // does not stop read at 'whitespace' chars
    
    cout << "\nHello, " << name << "!" << endl << endl;
    
    system("PAUSE");
    return 0;
    }
    A trivial example, of course, but illustrates how to avoid extra typing if you don't have the inclination.

    -Skipper
    "When the only tool you own is a hammer, every problem begins to resemble a nail." Abraham Maslow

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