Using Ubuntu, How Do You Install a C++ Compiler and Run a Basic C++ Program?

Problem scenario
You want to install a C++ compiler in Ubuntu.  You want to write a basic C++ program and run it.  How do you do these things?

1. As root, install a C++ compiler with this command:

apt install g++

2. Create a basic program.  Here is an example.  Name this file hello.cpp and put this as the content:

#include <iostream>

using namespace std;

int main()
    cout << "Hello from!" << endl;
    return 0;

3.  Compile the code with this command:

g++ hello.cpp

4.  Run the byte code with this command:


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