Question 1

The C++ operator * means the address of .

Accepted Answer

The C++ operator * means a few different things, depending on the context. It can be used as the multiplication operator, to dereference a pointer and access the value it points to, or to declare a pointer variable. The operator & is used to get the memory address of a variable. The * operator in C++ is usually used to dereference a pointer, not to mean the address of. The & operator is used to get the address of a variable.

Question 2

The asterisk ( * ) symbol is also called the ____ operator.
A) pointer
B) reference
C) increment
D) dereferencing

Accepted Answer

The asterisk symbol is used to dereference a pointer variable to obtain the value stored at the memory address it points to. Therefore, it is commonly referred to as the dereferencing operator. The asterisk symbol is known as the dereferencing operator in programming. It is used to access the value referred to by a pointer variable.

Question 3

The address named as a reference can be altered.

Accepted Answer

A reference in programming languages like C++ is an alias for another variable and once established, it cannot be made to refer to a different variable.

Question 4

References are used almost exclusively as formal function parameters and ____ types.
A) object
B) class
C) return
D) constant

Accepted Answer

References are often used as return types in functions to allow functions to return a reference to a variable instead of a copy, enabling operations like chaining.

Question 5

As each variable is defined in a program, sufficient storage for it is assigned from a pool of computer memory locations made available to the compiler.

Accepted Answer

When a variable is defined, memory is assigned to it from a pool of memory locations available to the compiler. When a variable is defined, memory is allocated for it from the computer's memory pool.

Question 6

To use a stored address, C++ provides us with an indirection operator, ____.
A) &
B) *
C) %

Accepted Answer

The indirection operator in C++ is represented by * and is used to access the value stored at the address pointed to by a pointer variable. The indirection or dereference operator (*) in C++ is used to access the value stored at the address.

Question 7

For each array created, the array name becomes the name of the pointer constant the compiler creates for the array.

Accepted Answer

The answer of For each array created, the array name...

Question 8

____ are simply variables used to store memory addresses.
A) Pointers
B) Objects
C) Arrays
D) Vectors

Accepted Answer

Pointers are variables used to store memory addresses. Objects, arrays, and vectors are all data structures used to store and organize data, but they do not specifically refer to memory addresses. Pointers are used to store memory addresses. Objects, arrays, and vectors are used to store data values.

Question 9

Essentially, a(n) ____ is a named constant for an address.
A) pointer
B) reference
C) class
D) indirection

Accepted Answer

A reference is essentially a named constant for an address, allowing indirect access to a variable.

Question 10

When used in declaring reference arguments, the ampersand refers to the data type preceding it.

Accepted Answer

This statement is true. When declaring a reference argument, the ampersand (&) comes after the data type of the argument it is referring to. This is true. The ampersand in a reference argument declaration refers to the data type preceding it, indicating that it is a reference to that data type.

Question 11

Technically, references are said to be ____.
A) explicitly dereferenced
B) statically dereferenced
C) manually dereferenced
D) automatically dereferenced

Accepted Answer

References in most modern programming languages are automatically dereferenced, meaning that the programmer does not need to manually dereference them or explicitly specify how to access the value pointed to by the reference. References in most programming languages are automatically dereferenced, meaning the values they point to are accessed without any explicit or manual dereferencing needed.

Question 12

If a character s address is stored in a pointer, only ____ byte(s) of storage would be retrieved when the address is used.
A) one
B) two
C) four
D) six

Accepted Answer

When a character's address is stored in a pointer and that address is used, only one byte of storage is retrieved because a character typically occupies one byte of memory.

Question 13

The delete operator alters the address passed to it.

Accepted Answer

The delete operator deallocates the memory pointed to by the address passed to it, but it does not alter the address itself. The pointer will still contain the same value, but accessing the memory at that address after deletion results in undefined behavior. The delete operator deallocates the memory pointed by the address passed to it, but it doesn't alter the address itself. The address will still have the same value, but the memory it points to will no longer be reserved for the program to use.

Question 14

Reference variables are available in C++.

Accepted Answer

Reference variables are available in C++. They allow an alias to be made for an existing variable, which can be useful for passing function arguments or creating convenient shorthand for frequently used variables. Reference variables can be declared in C++, they are aliases to existing variables and provide another name to refer to the same memory location.

Question 15

A(n) ____ error is produced when an attempt is made to equate a reference to a constant.
A) logic
B) compiler
C) codec
D) executable

Accepted Answer

A compiler error occurs because the compiler detects an attempt to assign a constant value to a reference, which is not allowed in many programming languages. This is a syntax or semantic error caught during the compilation process.

Question 16

If the integer s address is stored in a pointer, typically only ____ bytes of storage are retrieved when the address is used.
A) two
B) three
C) four
D) eight

Accepted Answer

Typically, an integer address is stored in a 32-bit pointer. Therefore, only four bytes of storage are retrieved when the address is used. On most modern systems, an integer is typically 4 bytes long and therefore only 4 bytes of storage are retrieved when its address is used.

Question 17

Addresses cannot be incremented or decremented.

Accepted Answer

In programming, particularly in languages like C or C++, pointers representing addresses can be incremented or decremented to navigate through memory locations, such as elements in an array.

Question 18

Multiple references cannot be declared in a single statement.

Accepted Answer

Multiple references can be declared in a single statement in many programming languages, such as C++ and Java, by separating them with a comma.

Question 19

To display the address of a variable, you can use C++ s address operator, ____.
A) >>
B) ^
C) ::
D) &

Accepted Answer

The address of a variable can be obtained using the C++ address operator &. Therefore, the correct choice is D. The address operator in C++ is the ampersand (&) symbol, which is used to get the memory address of a variable. So, option D is the correct choice.

Question 20

The use of a pointer requires the computer to do a double lookup.

Accepted Answer

When a pointer is used, the computer needs to first look up the value of the pointer variable to determine the memory address it points to, and then look up the value stored at that memory address. This is known as a double lookup, which can have performance implications for certain types of operations. When a pointer is used, the computer first looks up the memory address pointed to by the pointer and then accesses the value at that address. This double lookup adds additional overhead and can slow down the program.

Quiz 10: Pointers

The C++ operator * means the address of .

The asterisk ( * ) symbol is also called the ____ operator.

The address named as a reference can be altered.

References are used almost exclusively as formal function parameters and ____ types.

As each variable is defined in a program, sufficient storage for it is assigned from a pool of computer memory locations made available to the compiler.

To use a stored address, C++ provides us with an indirection operator, ____.

For each array created, the array name becomes the name of the pointer constant the compiler creates for the array.

____ are simply variables used to store memory addresses.

Essentially, a(n) ____ is a named constant for an address.

When used in declaring reference arguments, the ampersand refers to the data type preceding it.

Technically, references are said to be ____.

If a character s address is stored in a pointer, only ____ byte(s) of storage would be retrieved when the address is used.

The delete operator alters the address passed to it.

Reference variables are available in C++.

A(n) ____ error is produced when an attempt is made to equate a reference to a constant.

If the integer s address is stored in a pointer, typically only ____ bytes of storage are retrieved when the address is used.

Addresses cannot be incremented or decremented.

Multiple references cannot be declared in a single statement.

To display the address of a variable, you can use C++ s address operator, ____.

The use of a pointer requires the computer to do a double lookup.