CH 9 - CSCI

12) A function may return a pointer, but the programmer must ensure that the pointer ________. A) still points to a valid object after the function ends B) has not been assigned an address C) was received as a parameter by the function D) has not previously been returned by another function E) None of these

A

19) Assuming ptr is a pointer variable, what will the following statement output? cout << *ptr; A) The value stored in the variable whose address is contained in ptr. B) The string "*ptr". C) The address of the variable stored in ptr. D) The address of the variable whose address is stored in ptr. E) None of these

A

1) The ________, also known as the address operator, returns the memory address of a variable. A) asterisk ( * ) B) ampersand ( & ) C) percent sign (%) D) exclamation point ( ! ) E) None of these

B

16) What will the following statement output? cout << &num1; A) The value stored in the variable called num1 B) The memory address of the variable called num1 C) The number 1 D) The string "&num1" E) None of these

B

10) Look at the following statement: sum += *array++; This statement ________. A) is illegal in C++ B) will always result in a compiler error C) assigns the dereferenced pointer's value, then increments the pointer's address D) increments the dereferenced pointer's value by one, then assigns that value E) None of these

C

11) Use the delete operator only on pointers that were ________. A) never used B) not correctly initialized C) created with the new operator D) dereferenced inappropriately E) None of these

C

14) Which of the following statements deletes memory that has been dynamically allocated for an array? A) int array = delete memory; B) int delete[ ]; C) delete [] array; D) new array = delete; E) None of these

C

22) Which statement displays the address of the variable num1? A) cout << num1; B) cout << *num1; C) cin >> &num1; D) cout << &num1; E) None of these

D

23) The following statement: cin >> *num3; A) stores the keyboard input into the variable num3 B) stores the keyboard input into the pointer called num3 C) is illegal in C++ D) stores the keyboard input into the variable pointed to by num3 E) None of these

D

3) The statement: int *ptr = nullptr; has the same meaning as ________. A) int ptr = nullptr; B) *int ptr = nullptr; C) int ptr* = nullptr; D) int* ptr = nullptr; E) None of these

D

13) Which of the following statements is not valid C++ code? A) int ptr = &num1; B) int ptr = int *num1; C) float num1 = &ptr2; D) All of these are valid. E) All of these are invalid.

E

21) Not all arithmetic operations may be performed on pointers. For example, you cannot ________ or ________ a pointer. A) multiply, divide B) add, subtract C) +=, -= D) increment, decrement E) None of these

A

26) If you are using an older compiler that does not support the C++ 11 standard, you should initialize pointers with ________. A) the integer 0, or the value NULL B) the null terminator '\0' C) a nonzero value D) All of these E) None of these

A

32) What will the following code output? int number = 22; int *var = &number; cout << var << endl; A) The address of the number variable B) 22 C) An asterisk followed by 22 D) An asterisk followed by the address of the number variable

A

5) ________ can be used as pointers. A) Array names B) Numeric constants C) Punctuation marks D) All of these E) None of these

A

7) In C++ 11, the ________ key word was introduced to represent the address 0. A) nullptr B) NULL C) weak_ptr D) All of these E) None of these

A

24) Dynamic memory allocation occurs ________. A) when a new variable is created by the compiler B) when a new variable is created at runtime C) when a pointer fails to dereference the right variable D) when a pointer is assigned an incorrect address E) None of these

B

27) Every byte in the computer's memory is assigned a unique ________. A) pointer B) address C) dynamic allocation D) name E) None of these

B

29) A pointer variable may be initialized with ________. A) any non-zero integer value B) a valid address in the computer's memory C) an address less than 0 D) A and C only E) None of these

B

31) What will the following code output? int number = 22; int *var = &number; cout << *var << endl; A) The address of the number variable B) 22 C) An asterisk followed by 22 D) An asterisk followed by the address of the number variable

B

35) To help prevent memory leaks from occurring in C++ 11, a ________ automatically deletes a chunk of dynamically allocated memory when the memory is no longer being used. A) null pointer B) smart pointer C) dereferenced pointer D) A and C only E) None of these

B

15) When this is placed in front of a variable name, it returns the address of that variable. A) asterisk ( * ) B) conditional operator C) ampersand ( & ) D) semicolon ( ; ) E) None of these

C

17) A pointer variable is designed to store ________. A) any legal C++ value B) only floating-point values C) a memory address D) an integer E) None of these

C

18) Look at the following statement: int *ptr = nullptr; In this statement, what does the word int mean? A) The variable named *ptr will store an integer value. B) The variable named *ptr will store an asterisk and an integer value. C) ptr is a pointer variable that will store the address of an integer variable. D) All of these E) None of these

C

2) With pointer variables, you can ________ manipulate data stored in other variables. A) never B) seldom C) indirectly D) All of these E) None of these

C

20) The ________ and ________ operators can be used to increment or decrement a pointer variable. A) addition, subtraction B) modulus, division C) ++, -- D) All of these E) None of these

C

25) The following statement: int *ptr = new int; A) results in a compiler error B) assigns an integer less than 32767 to the variable named ptr C) assigns an address to the variable named ptr D) creates a new pointer named int E) None of these

C

30) If a variable uses more than one byte of memory, for pointer purposes its address is ________. A) the address of the last byte of storage B) the average of the addresses used to store the variable C) the address of the first byte of storage D) general delivery E) None of these

C

34) Look at the following code: int numbers[] = {0, 1, 2, 3, 4 }; int *ptr = numbers; ptr++; After this code executes, which of the following statements is true? A) ptr will hold the address of numbers[0]. B) ptr will hold the address of the 2nd byte within the element numbers[0]. C) ptr will hold the address of numbers[1]. D) This code will not compile.

C

4) When you work with a dereferenced pointer, you are actually working with ________. A) a variable whose memory has been allocated B) a copy of the value pointed to by the pointer variable C) the actual value of the variable whose address is stored in the pointer variable D) All of these E) None of these

C

6) The contents of pointer variables may be changed with mathematical statements that perform ________. A) all mathematical operations that are legal in C++ B) multiplication and division C) addition and subtraction D) B and C E) None of these

C

9) When the less than ( < ) operator is used between two pointer variables, the expression is testing whether ________. A) the value pointed to by the first is less than the value pointed to by the second B) the value pointed to by the first is greater than the value pointed to by the second C) the address of the first variable comes before the address of the second variable in the computer's memory D) the first variable was declared before the second variable E) None of these

C

33) What will the following code output? int *numbers = new int[5]; for (int i = 0; i <= 4; i++) *(numbers + i) = i; cout << numbers[2] << endl; A) Five memory addresses B) 0 C) 3 D) 2 E) 1

D

8) What does the following statement do? double *num2; A) Declares a double variable named num2. B) Declares and initializes an pointer variable named num2. C) Initializes a variable named *num2. D) Declares a pointer variable named num2. E) None of these

D

28) When you pass a pointer as an argument to a function, you must ________. A) declare the pointer variable again in the function call B) dereference the pointer variable in the function prototype C) use the #include<func_ptr.h> statement D) not dereference the pointer in the function's body E) None of these

E