Thread: 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!

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

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....

thanx alot, i will try that tonight.

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

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.