If I understand your question, the number sign for a value or number can represent either a positive quantity or a negative quantity when attached to a native data type.
For other data types it can represent the opposite of, or can be an overloaded operator (either unary or binary) that can take on any representation you with the operator to have (which can include non-intuitive reasoning's).
There is no such term as "building function" in C++.
In C and in C++, the ++ operator means to increment. C++ was intended to be the next version, i.e. the incremental next step, of C, hence the use of the ++ operator.
...a function call.
yes,we can make function inline
Every C plus plus program that is a main program must have the function 'main'.
Control is returning to the caller of the function.
method
It is the first function that gets called when the program is executed.
It is a quadratic function which represents a parabola.
Use function mkdir.
to locate coordinates ..
Use the C++ getline() function from the standard library.