C++ cout

This is a discussion on C++ cout within the C++ Programming forums, part of the General Programming Boards category; Hallo, I have been frustarting myself with trying to dispaly anything on my console application using cout but i just ...

  1. #1
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    Talking C++ cout

    Hallo, I have been frustarting myself with trying to dispaly anything on my console application using cout but i just can seem to do it.
    Pleas help

  2. #2
    Registered User hk_mp5kpdw's Avatar
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    What compiler/IDE do you have? What have you tried? What errors are you getting?

    Try this:
    Code:
    #include <iostream>
    
    int main()
    {
        std::cout << "Hello World" << std::endl;
        return 0;
    }
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
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    Talking

    Thanks this seems to be the key, i am using the .NET frame work.

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    * Death to Visual Basic * Devil Panther's Avatar
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    I'm really new to C++ but as far as I read and attempted to compile you need the:
    Code:
    using namespace std;
    So you could use just cout without the std::

    Example:
    Code:
    #include <iostream>
    
    using namespace std;
    
    int main()
    {
        cout << "Hello World\n";
        return(0);
    }
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    Quote Originally Posted by Devil Panther
    I'm really new to C++ but as far as I read and attempted to compile you need the:
    Code:
    using namespace std;
    So you could use just cout without the std::

    Example:
    Code:
    #include <iostream>
    
    using namespace std;
    
    int main()
    {
        cout << "Hello World\n";
        return(0);
    }

    While that's true, once you start working with multiple namespaces, you'll wish you'd used std::. Using std:: also helps you understand what is in the namespace std and what is not.
    Last edited by FoodDude; 09-14-2005 at 03:16 PM.

  6. #6
    * Death to Visual Basic * Devil Panther's Avatar
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    I really wouldn't know about multiple namespaces, I just started C++ last week or so... finally moved on from C

    But can you please explain what do you mean by multiple namespaces, and why is it better to work with std:: ?
    "I don't suffer from insanity but enjoy every minute of it" - Edgar Allen Poe

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    I'm fairly new to c++ but many years in programming other languages.

    Let's say you write a program with a lot of cool custom functions. You could place all those functions in a namespace. then, you'd reference those functions with that namespace qualifier:

    using namespace cool;

    ...
    ...
    std::string blandtext;
    std::string fancytext;

    fancytext = cool::fancyit(blandtext);

    This doesn't seem like much...now have several custom namespaces for different types of formatting, printing, file stuff, ANYTHING. When you are working through your code with all types of custom functions, it will be easier to recognize your functions from std functions and even which type of custom fuction you are using at that time. Write a large program. Walk away for 6 months. You get an email to add some functionality. Now go in to make the changes. The easier it is to read, the easier to modify the code.

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    once you start working with multiple namespaces, you'll wish you'd used std::
    If you really wanted to do that couldn't you just use std:: at the beginning with
    Code:
    using std::cout;
    or is that the same idea as namespace std?
    And whoever said death to Visual Basic, what is bad about it because I asked for a Visual Basic .NET book for my birthday (being foolishly new to standalone apps just having come from the world of JavaScript about a month ago).
    Last edited by beanroaster; 09-14-2005 at 03:34 PM.
    Adam

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    * Death to Visual Basic * Devil Panther's Avatar
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    I see... One last thing, what are namespaces??? Since books and guides use them, but non of them really explain the subject... is it like a class?

    p.s: I'm sorry if this is a really stupid question
    "I don't suffer from insanity but enjoy every minute of it" - Edgar Allen Poe

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    * Death to Visual Basic * Devil Panther's Avatar
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    Quote Originally Posted by beanroaster
    And whoever said death to Visual Basic, what is bad about it because I asked for a Visual Basic .NET book for my birthday (being foolishly new to standalone apps just having come from the world of JavaScript about a month ago).

    yeah... well it's easier than C/C++ and limited as well, I simply don't believe it's a good language to start with (like many people do) nor I belive it's a good lanauge to develope heavy or even mideum size apps. But that's just me
    "I don't suffer from insanity but enjoy every minute of it" - Edgar Allen Poe

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    Registered User Tonto's Avatar
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    http://www.cplusplus.com/doc/tutorial/tut5-2.html

    This keeps everything out of the global namespace, in it's own seperate scope in a project. All ANSI C++ header contents are loaded into the std namespace, which is why you see things like std::cout, std::pow, std::printf, std::whatever. The using namespace std; is somewhat of a battle, but I'm sure in very large unwieldy project, multiple coders, you would probably be happy you didn't stick it in a global header, but I'm not all that sure. It sure does make your code look l33t and verbose to reference absolutely everything through the global or std namespaces though.

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    Quote Originally Posted by Devil Panther
    I see... One last thing, what are namespaces??? Since books and guides use them, but non of them really explain the subject... is it like a class?

    p.s: I'm sorry if this is a really stupid question
    a namespace isn't a class it is as it says a namespace. It is kind of hard to explain.
    Code:
    #include <iostream>
    
    namespace ns
    {
        void addSomething()
        {
            std::cout<<5 + 7<<std::endl;
        }
    }
    void addSomething()
    {
        std::cout<<2 + 4<<std::endl;
    }
    
    int main()
    {
        addSomething();
        ns::addSomething();
        
        std::cin.get();
        
        return 0;
    }
    This is a generic example but it gets the point across what a namespace does.
    Woop?

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    Dae
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    Quote Originally Posted by beanroaster
    If you really wanted to do that couldn't you just use std:: at the beginning with
    Code:
    using std::cout;
    or is that the same idea as namespace std?
    using std::cout is sort of the same idea as using namespace std;. using namespace std allows all of the objects/functions of that namespace to be used without the std:: in front, which could cause conflicts if any other part of the program had a thing named cout, etc. using std::cout poses the same problem: if theres another thing named cout in the program it could potentially cause a conflict, however since its only using std::cout, cin and the rest of the namespace std wouldnt pose any problem ever, where as with using namespace std its using the entire namespace and potentially could. Then theres std::, and that poses no problems ever unless you happened to name one of your namespaces std
    Warning: Have doubt in anything I post.

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    Then theres std::, and that poses no problems ever unless you happened to name one of your namespaces std
    Thats what I did the first few days of my C++ programming and all of those colons got really annoying once I started making bigger things.
    Adam

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    Dae
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    Quote Originally Posted by beanroaster
    Thats what I did the first few days of my C++ programming and all of those colons got really annoying once I started making bigger things.
    I find they make my programs look programming-like complex so I like using it for that reason.. sort of like I know what the hell I'm doing.
    Warning: Have doubt in anything I post.

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