Although the source code in your file is somewhat cryptic, and anyone who doesn't know C++ will struggle to understand what it is for, it is still in what we call human-readable form. Your source code file is not a program, and it can't be executed or run as a program can.
To turn your source code into a program, a compiler is used. How you invoke your compiler and how you tell it where to find your source code will vary from compiler to compiler; check your documentation.
If you compile the source code from the operating system's command line, type the following: