700+ câu trắc nghiệm Ngôn ngữ lập trình C có đáp án - Phần 19

21,21

20,21

21,22

compile error

100

101

none

compile error

Encapsulation

Information Hiding

Data abstraction

All of the above

all of above

(i)

(i), (iii)

friend

inline

static

virtual

Information hiding

Inheritance

Redefinition

Overloading

The appropriate redefined version of the function will be used

The base-class version of the function will always be used

The outcome is unpredictable

A run-time error will occur

A const member

A reference parameter

A static member

A function member

An abstract class that is at the top of the inheritance hierarchy.

A class with a pure virtual function in it.

A class that inherits from another class

A class that is inherited by another class, and thus is included in that class.

Is visible only in the subclasses (and not in the class it is declared in)

Is visible only in the class it is declared in

Is visible to all classes, but modifiable only in the class where it is declared

Is visible in the class it is declared in, and all of its sub-classes

A function called when an instance of a class is initialized

A function that is called when an instance of a class is deleted

A special function to change the value of dynamically allocated memory

A function that is called in order to change the value of a variable

The public members of the base class become public

The public members of the base class become protected

The protected members of the base class become private

The public members of the base class become inaccessible

Each instance of a class will have its own copy of the variable

Changing the variable in one instance will have no effect on other instances of the class

Every instance of the class must consider the value of the static variable before initializing

Used to instantiate an object from another existing object

To copy one object to another existing object

Can be a substitute for a ‘=’ operator

All of the above

Have wine and cheese with that other friend

Allow that class to declare an instance of it in its list of private variables

Allow the other class (the one declared as friend) to access to the declaring class’s private variables

Allow the class declaring the other as a friend to access the declared class’s private variables

constructors

destructors

static functions

None of the above

In the catch block

In the throw clause

In the constructor of a class

Only when memory allocation fails

can be used without an instantiation of an object

can only access static data

Both 1 and 2 are correct

Neither 1 nor 2 are correct

The class must not have method

The class must have a constructor that takes no arguments

The class must have a function definition equal to zero

The class may only exist during the planning phase

1

2

3

error

i1=2 i2=2

i1=2 i2=3

i1=3 i2=2

Error

only a and b

a,b and c

only a

error

0

5

6

7

There is nothing wrong

One cannot have a ‘Base’ pointer to ‘Derived’ since it is not derived publicly

One need a derived class pointer to point to a derived class

One required to code a constructor for Derived

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