Central Queensland Linux User Group

In our second exercise we moved on to inputting text and printout out the results. The code below asks you for your name and then says hello :)

Open your preferred text editor, input the text in bold below and then save it as name.cpp

#include <iostream>

#include <string>

using namespace std;

int main ()

{

     string name;

     cout << "Enter your name: " ;

     cin >> name;

     cout << "Hello "<< name << endl;

     return 0;

}

Now in the terminal type:

$ g++ name.cpp -o name

You should now be able to run your newly written program with the command:

$ ./name

Enjoy!

This exercise has been designed to create and then compile your first C++ program as part of the basic “teachings” of using the GNU “g++” compiler.

In the tradition with initial programming, this exercise will focus on creating a “Hello World” C++ program.

A "Hello world" program is a computer program that prints out "Hello world" on a display device. It is typically one of the simplest programs possible in most programming languages. Therefore, by tradition, it often the first program taught in a beginning class on a particular language. It is also used to illustrate the most basic syntax of a programming language.  Cited (http://en.wikipedia.org/wiki/Hello_world_program)

Therefore I would ask those interested to try out the following:Create a hello.cpp file using your favourite text editor containing the following:

#include <iostream>

using namespace std;

int main()

{

   cout << "Hello World!" << endl;

   return 0;

}

• Compile your newly created  C++ program using the following command line syntax (note, if you don’t have g++ installed, you will need to install it)

g++ hello.cpp -o hello

• Then execute your newly compiled program using the following command:

./hello

• You should see the following output

$ g++ hello.cpp -o hello

$ ./hello

Hello World!