C++ Compiler in Ubuntu 10.04 LTS

[rshinde70]

Hi Friends..
I'm using Ubuntu 10.03LTS. Now days I've started learning C++.
But unfortunately, Only c codes can be compiled on This version of ubuntu while I'm not able to compile/run C++ codes.
is here anybody knows the right solution???

[cgroza]

You need the G++ compiler. You can get it by:


sudo apt-get install build-essential

[rshinde70]

You need the G++ compiler. You can get it by:


sudo apt-get install build-essential

It's already installed, :(

[cgroza]

How about:


sudo apt-get install g++

You run it by:


g++ filename

[rshinde70]

How about:


sudo apt-get install g++You run it by:


g++ filename

The same problem continues...
What gcc shows if i tries to comile like..
r
ohit@rohit-desktop:~$ sudo apt-get install g++
[sudo] password for rohit:
Reading package lists... Done
Building dependency tree
Reading state information... Done
g++ is already the newest version.
g++ set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 234 not upgraded.
rohit@rohit-desktop:~$ vi trial.cpp
rohit@rohit-desktop:~$ g++ trial.cpp
trial.cpp:1:21: error: iostream.h: No such file or directory
trial.cpp: In function ‘int main()’:
trial.cpp:4: error: ‘cout’ was not declared in this scope
rohit@rohit-desktop:~$

[cgroza]

Ok, from now it is just compile errors.

The include line should be:


#include <iostream> // standard library header files do not have .h extension.

And with the cout error, you could put a:


using namespace std;

or std:: right before the cout statement.

[rshinde70]

Ok, from now it is just compile errors.

The include line should be:


#include <iostream> // standard library header files do not have .h extension.

And with the cout error, you could put a:


using namespace std;or std:: right before the cout statement.

Thanks Brother. I understood about that header file But i didn't understand about 'cout'
I really didn't understand. Could you explain it please?

[cgroza]

It is because the cout function is present in the std namespace. The "cout::" or using namespace std introduces this new name in the current name space so you can use it.

Read a little bit about namespaces in C++ and you will understand. It basically groups things that have something in common.

EDIT: std:: does not introduce new names in the current namespace, but only accesses it from there.