cin/cout under Linux...

This is a discussion on cin/cout under Linux... within the Linux Programming forums, part of the Platform Specific Boards category; I have been a windows user for a long time (far too long), and learned c++ using borland C++Builder 5. ...

  1. #1
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    Question cin/cout under Linux...

    I have been a windows user for a long time (far too long), and learned c++ using borland C++Builder 5. Although i am quite proficient at programming in that environment, i recently decided to try out linux (first Slackware 7, now Redhat 7.1).

    Obviously, one of the things i tried was to write a program ("hello world..." you know the variety), just to get to know the way of doing things under linux better. To my surprise, i couldn't get cout and cin to work! (i /did/ #include <iostream>;) So I used gets() and puts() instead.

    Now, i have read about cin and cout, but never had to use them, because of all the other nice features that builder has, like editboxes and so forth. Can someone please, oh very please show me sample "hello world" code, using cin and/or cout that works in linux?



    As a side issue, how do I get rid of the GUI in redhat 7.1 - i want to work in a pure console (not an emulator)? The GUI is nice and dandy, but when i am working in linux, i really don't want to be reminded of windows!

  2. #2
    and the hat of wrongness Salem's Avatar
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    Did you do these two things as well

    1. Put the source code in a .cpp file - eg. prog.cpp
    2. use the c++ compiler, not the c compiler - eg. g++ prog.cpp

    The result (if all is well) should be a file called a.out, which you run by typing
    ./a.out

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    Registered User stautze's Avatar
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    >As a side issue, how do I get rid of the GUI in redhat 7.1


    http://www.cprogramming.com/cboard/s...threadid=18995
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  4. #4
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    also,

    you must bring elements cin and cout into scope from the std namespace with the using keyword (when you are using <iostream> instead of the depreciated <iostream.h>) that's just standard, it's not linux specific, although it's compiler specific...

    Code:
    #include <iostream>
    
    using std::cout;
    
    int main ()
    {
        cout << "Hello, world!" << endl;
        return 0;
    }
    you can always access a console login with ctrl+alt+F1 through ctrl+alt+F6...alt+ F7 to get back to X....

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    thanx alot, i will try that tonight.

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    Registered User stautze's Avatar
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    >you can always access a console login with ctrl+alt+F1 through ctrl+alt+F6...alt+ F7 to get back to X....

    Just remember your xserver it still running.
    'During my service in the United States Congress, I took the initiative in creating the Internet.' - Al Gore, March 9, 1999: On CNN's Late Edition

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    Smile

    Just include "stdio.h"
    Then you can use all the "C" io functions
    eg. printf etc..etc..

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    #include <iostream>
    using namespace std;

    int main()
    {

    cout <<"hello world"<<endl;
    exit(0);
    }

    save this as example.cpp

    in the console

    type

    g++ -o executable_name example.cpp
    and compıle it
    the run
    C++ Makes you Feel Better

    "Gravity connot be held reponsible for people falling in love"--Albert Einstein

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    onurak wrote
    Code:
     #include <iostream> 
    using namespace std; 
    
    int main() 
    { 
    
    cout <<"hello world"<<endl; 
    exit(0); 
    }
    Did you even test this, the exit function requires <cstdlib> to work.

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    Huh, this is advanced stuff

    Erh, guys... This is a "Hello world" program... it shouldn't really be any trouble. Well, just so you don't flame me:

    #include <iostream.h>

    int main(void) {

    cout << "Hello world" << endl;

    return 0;

    }

    Hehe, wouldn't wonder if that doesn't work either, I never use cout... printf kicks. Ass.
    I like traffic lights. I like traffic lights. I like traffic lights, but only when they're green.

  11. #11
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    exit function works well with iostream liblary no problem i always use exit() function with iostream liblary
    C++ Makes you Feel Better

    "Gravity connot be held reponsible for people falling in love"--Albert Einstein

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