C++ Midterm

Front 1

A characteristic of operator overloading is

Back 1

giving new meanings to c++ operators

Front 2

An overloaded operator always requires ______ its number of operands

Back 2

One less argument than

Front 3

Assume a class C exists with objects obj1, obj2, and obj3. For the statement obj3 = obj1 - obj2 to work correctly, the overloaded - operator must

Back 3

return a value

Front 4

How many arguments are required in the definition of a unary operator

Back 4

none

Front 5

Of the following C++ operators, which can be overloaded

Back 5

>=

Front 6

Operator overloading also allows the programmers to

Back 6

make c++ operators work with objects

Front 7

the compiler won't object if you overload the _____ operator to perform division, but it will be difficult for humans to understand

Back 7

- * +

Front 8

To convert from a basic type to a user-defined class, you would most likely use

Back 8

a one-argument constructor

Front 9

When you overload an arithmetic operator, the result

Back 9

goes in the object to the left of the operator

Front 10

A copy constructor is invoked when

Back 10

an argument is passed by value

Front 11

A friend function can be used to

Back 11

allow access to an unrelated class

Front 12

A pure virtual function is a function that

Back 12

is used in a base class

Front 13

A static function

Back 13

can be called using the class name and function name

Front 14

An abstract class is useful when

Back 14

no objects should be instantiated from it

Front 15

An assignment operator might be overloaded for all of the reasons exept

Back 15

ensure that all member data is copied exactly

Front 16

the keyword friend appears in all of the following except

Back 16

the class desiring access to another class

Front 17

the lifetime of a variable that is

Back 17

local to a member function coincides with the lifetime of the function

Front 18

the operation of the assignment operator and that of the copy constructor are

Back 18

similar, except that the copy constructor creates a new object

Front 19

Virtual functions allow you to

Back 19

use the same function call to execute member functions of objects from different classes

Front 20

A C++ stream is

Back 20

a flow of data from one place to another

Front 21

the base class for most stream classes is the _____ class

Back 21

ios

Front 22

All of the following are stream classes commonly used for disk I/O except

Back 22

sstream

Front 23

Some streams work with input, some with output

Back 23

True

Front 24

We can output text to an object of class ofstream using the insertion operator << because

Back 24

the insertion operator is overloaded in ofstream

Front 25

To write data that contains variables of type float to an object of type ofstream, you should use

Back 25

write()

Front 26

Mode bits such as app and ate accomplish all of the following except

Back 26

work with the put() and get() functions

Front 27

A file pointer always contains the address of the file

Back 27

False

Front 28

The statement f1.write((char)&obj1, sizeof(obj1));

Back 28

writes the data in obj1 to f1

Front 29

Command-line arguments are

Back 29

accessed through arguments to main()