Question 1

Which arithmetic operations can be performed on pointers?

Accepted Answer

A)   All arithmetic operations that are legal in C++
B)   Multiplication, division, addition, and subtraction
C)   Addition , subtraction , preincrement, and postincrement
D)   Only multiplication and addition
E)   None of the above

Question 2

The statement int *ptr; means

Accepted Answer

A)   the variable called ptr will store an integer value.
B)   the variable called *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 the above
E)   None of the above

Question 3

A function may return a pointer, but the programmer must ensure that the pointer

Accepted Answer

A)   is pointing to an object that is still valid after the return of the function.
B)   has 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 the above

Question 4

An array name is a pointer constant because the address it represents cannot be changed during run-time.

Accepted Answer

A) True 
 B)False

Question 5

With pointer variables you can access, but you cannot modify, data in other variables.

Accepted Answer

A) True 
 B)False

Question 6

The expression *s->p; is only meaningful if s is a pointer to a structure and p is a pointer that is a member of that structure.

Accepted Answer

A) True 
 B)False

Question 7

The expression s->m has the same meaning as (*s).m.

Accepted Answer

A) True 
 B)False

Question 8

A pointer can be passed as an argument to a function.

Accepted Answer

A) True 
 B)False

Question 9

A statement that displays the address of the variable num1 is

Accepted Answer

A)   cout 
B)   cout 
C)   cout 
D)   cout 
E)   None of the above

Question 10

Suppose that a function dynamically allocates a block of memory with a local pointer variable p pointing to the allocated block. Suppose further that there are no other pointers referencing that block of memory, and the function returns without doing a delete on p. Then

Accepted Answer

A)   the pointer p becomes a dangling pointer.
B)   the compiler will automatically deallocate the memory pointed to by p.
C)   the program will suffer from memory leaks.
D)   the returning function will throw the bad_alloc exception.
E)   None of the above

Question 11

C++ does not perform array bounds checking.

Accepted Answer

A) True 
 B)False

Question 12

If s is a structure variable and p, a pointer, is a member of the structure, the statement cout << *s.p; will

Accepted Answer

A)   output the dereferenced value pointed to by p.
B)   result in a compiler error.
C)   output the address stored in p.
D)   output the value stored in s.
E)   None of the above A

Question 13

To dereference a structure pointer and simultaneously access a member of the structure, the appropriate operator to use is

Accepted Answer

A)   the ampersand, &.
B)   an asterisk, *.
C)   the structure pointer operator, ->.
D)   the dereference operator, 
E)   None of the above C

Question 14

The ampersand (&) is used to dereference a pointer variable in C++.

Accepted Answer

A) True 
 B)False  False

Question 15

Which of the following statements correctly deletes a dynamically-allocated array pointed to by p?

Accepted Answer

A)   delete p;
B)   p delete[ ];
C)   delete [ ] p;
D)   delete array p;
E)   None of the above

Question 16

A pointer variable may be initialized with

Accepted Answer

A)   any non-zero integer value.
B)   the address of an existing variable of the appropriate type.
C)   A and B are both True.
D)   None of the above

Question 17

A pointer with the value 0 (zero) is called the NULL pointer.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following statements is not valid C++ code?

Accepted Answer

A)   int ptr = &num1;
B)   int ptr = int *num1;
C)   float num1 = &ptr2;
D)   All of the above are valid.
E)   All of the above are invalid.

Question 19

The code segment int *ptr; has the same meaning as

Accepted Answer

A)   int ptr;.
B)   *int ptr;.
C)   int ptr*;.
D)   int* ptr;.
E)   None of the above

Question 20

A reason for passing a pointer to a function is

Accepted Answer

A)   to avoid the overhead of copying large data structures.
B)   to allow the called function to modify a variable accessible to the calling function.
C)   to allow easy access to data in the function that is being called.
D)   A and B are both True.
E)   None of the above

Exam 10: Pointers

Which arithmetic operations can be performed on pointers?

Correct AnswerverifiedShow Answer

The statement int *ptr; means

Correct AnswerverifiedShow Answer

A function may return a pointer, but the programmer must ensure that the pointer

Correct AnswerverifiedShow Answer

An array name is a pointer constant because the address it represents cannot be changed during run-time.

Correct AnswerverifiedShow Answer

With pointer variables you can access, but you cannot modify, data in other variables.

Correct AnswerverifiedShow Answer

The expression *s->p; is only meaningful if s is a pointer to a structure and p is a pointer that is a member of that structure.

Correct AnswerverifiedShow Answer

The expression s->m has the same meaning as (*s).m.

Correct AnswerverifiedShow Answer

A pointer can be passed as an argument to a function.

Correct AnswerverifiedShow Answer

A statement that displays the address of the variable num1 is

Correct AnswerverifiedShow Answer

Suppose that a function dynamically allocates a block of memory with a local pointer variable p pointing to the allocated block. Suppose further that there are no other pointers referencing that block of memory, and the function returns without doing a delete on p. Then

Correct AnswerverifiedShow Answer

C++ does not perform array bounds checking.

Correct AnswerverifiedShow Answer

If s is a structure variable and p, a pointer, is a member of the structure, the statement cout << *s.p; will

Correct AnswerverifiedA

To dereference a structure pointer and simultaneously access a member of the structure, the appropriate operator to use is

Correct AnswerverifiedC

The ampersand (&) is used to dereference a pointer variable in C++.

Correct AnswerverifiedFalse

Which of the following statements correctly deletes a dynamically-allocated array pointed to by p?

Correct AnswerverifiedShow Answer

A pointer variable may be initialized with

Correct AnswerverifiedShow Answer

A pointer with the value 0 (zero) is called the NULL pointer.

Correct AnswerverifiedShow Answer

Which of the following statements is not valid C++ code?

Correct AnswerverifiedShow Answer

The code segment int *ptr; has the same meaning as

Correct AnswerverifiedShow Answer

A reason for passing a pointer to a function is

Correct AnswerverifiedShow Answer

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C

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False

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