How to run a C++ program in linux

Install g++ (Ubuntu) or gcc-c++ (RedHat or fedora) package using 

apt-get or yum.

sudo apt-get install g++

or 

yum install gcc-c++

Write a C++ program using your favorite editor.

emacs hello_world.cpp

or

vi hello_world.cpp

or

gedit hello_world.cpp

 #include <iostream>  

  using namespace std; 
  int main() { 
 
      cout << "Hello World!\n";
         
      return 0;
  }

The following command will compile your program 

and create an executable called a.out

   g++ hello_world.cpp

The following command will execute your program.

  ./a.out

Congratulations! You are done!