College computing chapter 9 quiz

When you pass a pointer as an argument to a function, you must

None of these

What will the following code output? int number = 22; int *var = &number; cout << var << endl;

The address of the number variable

What will the following statement output? cout << &num1;

The memory address of the variable called num1.

The ______ and _______ operators can be used to increment or decrement a pointer variable.

++, --

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;

2

What will the following code output? int number = 22; int *var = &number; cout << *var << endl;

22

Every byte in the computer's memory is assigned a unique

Address

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

All of these are invalid

These can be used as pointers....

Array names

What does the following statement do? double *num2;

Declares a pointer variable named num2.

True/False: With pointer variables you can access, but you cannot modify, data in other

False

Assuming myValues is an array of int values, and index is an int variable, both of the following statements do the same thing. cout << myValues[index] << endl; cout << *(myValues + index) << endl; (T,F)

True

True/False: A pointer can be used as a function argument, giving the function access to the original argument.

True

True/False: A pointer with the value 0 (zero) is called a NULL pointer.

True

True/False: An array name is a pointer constant because the address stored in it cannot be changed during runtime.

True

True/False: C++ does not perform array bounds checking, making it possible for you to assign a pointer the address of an element out of the boundaries of an array.

True

True/False: It is legal to subtract a pointer variable from another pointer variable.

True

A pointer variable is designed to store

a memory address.

The contents of pointer variables may be changed with mathematical statements that perform:

addition and subtraction

The _________ , also known as the address operator, returns the memory address of a variable.

ampersand ( & )

When this is placed in front of a variable name, it returns the address of that variable.

ampersand ( & )

A pointer variable may be initialized with

any address in the computer's memory

The statement int *ptr = new int;

assigns an address to the variable named ptr.

Look at the following statement: sum += *array++; This statement...

assigns the dereferenced pointer's value, then increments the pointer's address

Which statement displays the address of the variable num1?

cout << &num1

Use the delete operator only on pointers that were

created with the new operator

Which of the following statements deletes memory that has been dynamically allocated for an array?

delete [] array;

The statement int *ptr; has the same meaning as

int* ptr;

Not all arithmetic operations may be performed on pointers. For example, you cannot ________ or __________ a pointer.

multiply, divide

Look at the following statement. int *ptr; In this statement, what does the word int mean?

ptr is a pointer variable that will store the address of an integer variable

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?

ptr will hold the address of numbers[1]

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

still points to a valid object after the function ends

The statement cin >> *num3;

stores the keyboard input into the variable pointed to by num3.

When using the new operator with an older compiler, it is good practice to:

test the pointer for the NULL address

When you work with a dereferenced pointer, you are actually working with:

the actual value of the variable whose address is stored in the pointer variable

A pointer may be initialized with

the address of an existing object

If a variable uses more than one byte of memory, for pointer purposes its address is:

the address of the first byte of storage.

When the less than ( < ) operator is used between two pointer variables, the expression is testing whether

the address of the first variable comes before the address of the second variable in the computer's memory

Assuming ptr is a pointer variable, what will the following statement output? cout << *ptr;

the value stored in the variable whose address is contained in ptr

Dynamic memory allocation occurs

when a new variable is created at runtime