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Thread: cout issue

  1. #1
    Join Date
    Aug 2006
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    140

    cout issue

    I've decided to try and learn a programming language. I used C++ many moons ago at Uni and thought if I'm going to start somewhere might as well be there. So I've installed Eclipse along with the extra C++ files. I've have written the following code:

    Code:
    #include <iostream.h>
    #include "stdafix.h"
    
    int main()
    {
    	cout << "Hello World!\n";
    		return 0;
    }
    which I assumed would simply work. Unfortunatly I get the error '"Symbol 'cout' could not be resolved." - Resource hello.cpp, path /hello, line 12, Type semantic error'.
    I figured it would be something I had written wrong so I rang the C++ Hellow World example that comes in Eclipse but this also fails to run with the same error.

    Have I missed something somewhere ?

    Thanks.

  2. #2
    Join Date
    Dec 2004
    Location
    Manchester
    Beans
    2,081
    Distro
    Ubuntu Studio 13.04 Raring Ringtail

    Re: cout issue

    cout is in the std namespace. either you need to give the full address to it
    Code:
    std::cout << "Hello World!\n";
    or you can put
    Code:
    using namespace std
    after the includes, to tell the compile to search std for identifiers.

  3. #3
    Join Date
    Apr 2012
    Beans
    5,159

    Re: cout issue

    I think your confusion arises because <iostream.h> is non-standard (and deprecated - in fact I'm not even sure it's included in modern distributions) - iirc it predated the adoption of namespaces so plain 'cout' used to work back in the day

    You should probably be using <iostream> (without the .h) - in which case you will need to specify the namespace, as ssam says

    Code:
    #include <iostream>
    
    int main()
    {
        std::cout << "Hello World!\n";
        return 0;
    }
    See article here for more info / background --> http://members.gamedev.net/sicrane/a.../iostream.html

    EDIT: not sure what your "stdafix.h" is - maybe you are trying to mimic Visual Studio's "stdafx.h" convention?
    Last edited by steeldriver; November 21st, 2012 at 04:40 PM. Reason: added link to background article

  4. #4
    Join Date
    Aug 2006
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    140

    Re: cout issue

    Thank you both very much for your help. Seems it was further back when I used it than my brain cells first thought. That has worked perfectly for me thanks.
    As for the stdafix.h, I found it in a C++ ebook I was reading and it was suggested as part of the test code for Hello World so I wasn't sure if it was something I was missing. Needless to say I have not stuck with that book.

  5. #5
    Join Date
    Aug 2006
    Beans
    140

    Re: cout issue

    Quote Originally Posted by toontastic View Post
    Thank you both very much for your help. Seems it was further back when I used it than my brain cells first thought. That has worked perfectly for me thanks.
    As for the stdafix.h, I found it in a C++ ebook I was reading and it was suggested as part of the test code for Hello World so I wasn't sure if it was something I was missing. Needless to say I have not stuck with that book.
    Actually I was wrong, that hasn't worked either. Still getting an error about cout. If I try to build the code I get.

    Code:
    **** Build of configuration Debug for project Hello ****
    
    make all 
    Building file: ../hello.cpp
    Invoking: GCC C++ Compiler
    g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"hello.d" -MT"hello.d" -o "hello.o" "../hello.cpp"
    ../hello.cpp: In function ‘int main()’:
    ../hello.cpp:6:2: error: ‘cout’ was not declared in this scope
    ../hello.cpp:6:2: note: suggested alternative:
    In file included from ../hello.cpp:1:0:
    /usr/include/c++/4.7/iostream:62:18: note:   ‘std::cout’
    What I now have written is

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

  6. #6
    Join Date
    Apr 2012
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    39

    Re: cout issue

    There is nothing wrong with that code. It should just compile and run. There must be something else going wrong.

  7. #7
    Join Date
    Apr 2012
    Beans
    5,159

    Re: cout issue

    Agreed - it builds and runs for me [NB on gcc/g++ 4.6.3 not 4.7] even with all of your extra compile options

    How did you install the build tools? maybe something is misconfigured?

    EDIT: just tried it in a crunchbang (Debian) VM with gcc/g++ 4.7.1 and it works there as well
    Last edited by steeldriver; November 23rd, 2012 at 12:30 AM. Reason: confirmed OK on gcc/g++ 4.7

  8. #8
    Join Date
    Jun 2007
    Location
    Porirua, New Zealand
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    Distro
    Ubuntu

    Re: cout issue

    @OP: Do you have build-essential installed?
    Forum DOs and DON'Ts
    Never assume that information you find using a search engine is up-to-date.

  9. #9
    Join Date
    Oct 2007
    Beans
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    Distro
    Lubuntu 12.10 Quantal Quetzal

    Re: cout issue

    Quote Originally Posted by toontastic View Post
    Actually I was wrong, that hasn't worked either. Still getting an error about cout. If I try to build the code I get.

    Code:
    **** Build of configuration Debug for project Hello ****
    
    make all 
    Building file: ../hello.cpp
    Invoking: GCC C++ Compiler
    g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"hello.d" -MT"hello.d" -o "hello.o" "../hello.cpp"
    ../hello.cpp: In function ‘int main()’:
    ../hello.cpp:6:2: error: ‘cout’ was not declared in this scope
    ../hello.cpp:6:2: note: suggested alternative:
    In file included from ../hello.cpp:1:0:
    /usr/include/c++/4.7/iostream:62:18: note:   ‘std::cout’
    What I now have written is

    Code:
    #include <iostream>
    
    int main()
    {
        std::cout << "Hello World!\n";
        return 0;
    }
    Are you sure that you pasted the correct contents of "hello.cpp"? Your compilation error message says that "cout" was not declared in line 6, but line 6 is actually "return 0;". Is it possible that in fact your IDE tries to compile your old code?

  10. #10
    Join Date
    Aug 2006
    Beans
    140

    Re: cout issue

    Quote Originally Posted by lisati View Post
    @OP: Do you have build-essential installed?
    Not sure, I installed all the extras that mentioned C++

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