cin/cout under Linux...

06-04-2002, 01:57 PM

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!

**Salem** · 06-04-2002, 02:09 PM

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

stautze · 06-04-2002, 05:14 PM

>As a side issue, how do I get rid of the GUI in redhat 7.1

http://www.cprogramming.com/cboard/s...threadid=18995

06-04-2002, 05:22 PM

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....

06-05-2002, 02:23 PM

thanx alot, i will try that tonight.

stautze · 06-05-2002, 08:19 PM

>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.

06-20-2002, 06:06 PM

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

onurak · 07-09-2002, 03:10 PM

#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 compýle it
the run

kwigibo · 07-09-2002, 06:51 PM

Quote:

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.

Skarr · 07-25-2002, 09:53 AM

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.

onurak · 07-26-2002, 05:06 AM

exit function works well with iostream liblary no problem i always use exit() function with iostream liblary

06-04-2002, 01:57 PM	#1
Unregistered Guest Posts: n/a	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!

06-04-2002, 02:09 PM	#2
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,693	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
Salem is offline

06-04-2002, 05:14 PM	#3
stautze Registered User Join Date: Apr 2002 Posts: 195	>As a side issue, how do I get rid of the GUI in redhat 7.1 http://www.cprogramming.com/cboard/s...threadid=18995 __________________ '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
stautze is offline

06-04-2002, 05:22 PM	#4
Unregistered Guest Posts: n/a	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....

06-05-2002, 08:19 PM	#6
stautze Registered User Join Date: Apr 2002 Posts: 195	>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
stautze is offline

06-05-2002, 02:23 PM	#5
Unregistered Guest Posts: n/a	thanx alot, i will try that tonight.

06-20-2002, 06:06 PM	#7
Unregistered Guest Posts: n/a	Just include "stdio.h" Then you can use all the "C" io functions eg. printf etc..etc..

07-09-2002, 03:10 PM	#8
onurak Registered User Join Date: Jun 2002 Posts: 106	#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 compýle it the run __________________ C++ Makes you Feel Better "Gravity connot be held reponsible for people falling in love"--Albert Einstein
onurak is offline

07-25-2002, 09:53 AM	#10
Skarr Registered User Join Date: Jul 2002 Posts: 29	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.
Skarr is offline

07-26-2002, 05:06 AM	#11
onurak Registered User Join Date: Jun 2002 Posts: 106	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
onurak is offline

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