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, you use a compiler. 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. In Borland's Turbo C++ you pick the RUN menu command or type
from the command line, where