Most C++ programs that do I/O should include the ____________ header that contains the declarations required for all stream-I/O operations.

The ORDER BY clause must be added to the beginning of an SQL statement after the WHERE clause

Indicate whether the statement is true or false

If Circle is a structure, what does the following statement do?

``` Circle *pcirc = nullptr; ``` a. It declares an empty structure variable named *pcirc. b. It declares a structure pointer called pcirc initialized with a null pointer. c. The statement is illegal in C++. d. It initializes a null pointer with the value of the Circle pointer. e. None of these