Could someone give a very clear and concise explanation of a very basic example program in C++ with showing passing variables by value and by reference.


I need to know exactly how to declare the function.
How to define the function?
And how to call the function?

The part I need over-explained is;
What values are being passed when a variable's address is being passed or value of the variable.
From what to what and where?

I am fine with the syntax and the basic concept of declaring, defining and calling. Need emphasis on passing variables.

Thanks

What is the explanation of c++?