What is an include guard?

What is the purpose of this line in a header file? #pragma once

What is a variable of type double?

Consider this function declaration of is_even, which takes in an integer and returns true if the argument is an even number and false otherwise. Which declarations are correct for overloaded versions of that function to support floating point numbers and string representations of numbers? bool is_even(int);

Other than shifting bits to the left, what is the << oprator used for ?

Which choice is a reason to specify the type of a pointer instead of using void *, which works as a pointer ro any type?

Which is(are) an example(s) of valid C++ function prototype(s)?

What is an advantage to using C++ Templates?

Can constructors be overloaded?

The printmsg function does not require any arguments. Choose the statement which calls the function.

In the following line of C++ code, int foo[50]; what does the number 50 represent?