QUESTION 13 The O asterisk(*) o ampersand (&) O percent sign (%) o exclamation point (!) O None of these ,also known as the address operator, returns the memory address of a variable. QUESTION 14 The contents of pointer variables may be changed with mathematical statements that perform: all mathematical operations that are legal in C++ O multiplication and division o addition and subtraction O multiplication and division and addition and subtraction None of these QUESTION 15 The statement cin O stores the keyboard input into the variable num3 O stores the keyboard input into the pointer called num3 O is illegal in C++ O stores the keyboard input into the variable pointed to by num3 O None of these num3 QUESTION 16 The statement int ptr new int O results in a compiler error O assigns an integer less than 32767 to the variable named ptr O assigns an address to the variable named ptr creates a new pointer named int None of these QUESTION 17 The statement int ptr has the same meaning as O int ptr O int ptr int ptr O int ptr O None of these QUESTION 18 These can be used as pointers. Array names O Numeric constants O Punctuation marks All of these None of these