iostream

This is a discussion on iostream within the C++ Programming forums, part of the General Programming Boards category; Hey guys and girls, I've been normally using gcc and g++ in linux to compile my codes but recently I've ...

  1. #1
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    iostream

    Hey guys and girls,
    I've been normally using gcc and g++ in linux to compile my codes but recently I've had to temporarily switch over to a Windows machine. I downloaded Dev from bloodshed and it works beautifully on my c code. However, it's missing <iostream.h> which is nessisary to run c++ code. Or is it?
    If anyone could recoment an alternernate library or information on creating or downloading <iostream.h> I would be very appriciative.
    Thanks.
    -=Wynter=-

  2. #2
    End Of Line Hammer's Avatar
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    Use:
    Code:
    #include <iostream>
    using namespace std;
    
    // Your code here
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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    Thanks for the speedy reply, Hammer. It worked perfectly.
    But why does
    Code:
    using namespace std;
    work? I know that namespace defines a class. So I guess we are 'using' the class called std.
    But how did that fix the problem? :-)
    -=Wynter=-

  4. #4
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    C++ now uses the new header files which do not have the .h ended. Some may have a c infront of them like cstring (not to be confused with the C++ string header file), cstdio, and cstdlib. These new header files have everything in the std namespace.

    A namespace is a grouping of classes, variables, functions, and other definitions. When we say we're using a namespace, we're bringing everything from that namespace into the global context so you dont have to type <namespace name>:: in front of everything.

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    Okay, so the new "iostream" (without the 'h') is a class inside the std namespace and that code just tells the compiler, "Hey man, go find that". I get it now. And that would explain why I couldn't find a iostream.h file.
    Thanks people.
    -=Wynter=-

  6. #6
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    Thats pretty much.

    One thing to note as well is that the headers without the '.h' extension are the standard headers, whereas headers _with_ the '.h' extension aren't the standard.

    The reason this is happening is because Dev C++ tries to follow the ISO standard alot =) Why it's good sometimes.
    OS: Windows XP Pro CE
    IDE: VS .NET 2002
    Preferred Language: C++.

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    Dev C++ is just an IDE, not a compiler.

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    >Dev C++ is just an IDE, not a compiler.
    Soo your saying that when I hit f9 it doesn't compile and run the program eh?
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  9. #9
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    Lightbulb Namespaces

    You can find more information about namespaces in the Programming FAQ. For most small homework-like programs, you can just go with 'using namespace std;' and be done with it. Other namespaces are only really useful when you have a big project with lots of custom header files, 3rd party libraries, and/or multiple programmers working on different parts of the program... Where there might be two different (global) functions with the same name. (Or, some other global variables/constants/structures/objects/etc., with the same name.)
    Dev C++ is just an IDE, not a compiler.
    How about "Dev-C++ is not just a compiler. It's a complete IDE."

    A IDE (Integrated Development Environment) isn't much of an IDE if it doesn't inlcude (at least) a compiler AND an editor!!!
    Last edited by DougDbug; 04-20-2004 at 05:37 PM.

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    >How about "Dev-C++ is not just a compiler. It's a complete IDE."
    Ok that makes sense then I was about to say...
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  11. #11
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    >>How about "Dev-C++ is not just a compiler. It's a complete IDE."
    That's not true. Although an IDE is not much use if it doesn't come with a compiler, an IDE will just allow you to edit your code and will provide an easy access you your compiler functions.
    An IDE is one thing. A compiler is another.
    Dev-C++ uses (by default I think) the MingW port of gcc and g++, and you can download both separate or in a package, but being in a package doesn't mean it's the same thing.

    >>Soo your saying that when I hit f9 it doesn't compile and run the program eh?
    Dev-C++ doesn't. gcc/g++ will. Although it will run the pogram (or rather tell Windows to run it).

    >>A IDE (Integrated Development Environment) isn't much of an IDE if it doesn't inlcude (at least) a compiler AND an editor!
    An IDE will be an IDE even without a compiler. A good IDE should allow you to use any compiler you choose and configure it to do so properly, even if it comes bundled with a compiler.
    SoKrA-BTS "Judge not the program I made, but the one I've yet to code"
    I say what I say, I mean what I mean.
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  12. #12
    Registered User major_small's Avatar
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    Dev-C++ isn't a compiler, it's just and IDE, and you can configure it to use any compiler you want... I still call it a compiler anyway, because saying I use a MingW port of G++ takes too long and people don't know what I mean, and when I just say I'm using G++ people think I'm on a *nix box... it's just more convienient to call Dev-C++ a compiler...
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