Q: What is the output of this program ? #include using namespace std; int n(char, int); int (*p) (char, int) = n; int main() { (*p)('d', 9); p(10, 9); return 0; } int n(char c, int i) { cout << c << i; return 0; }

In this program, we have declared the values as integer instead of character, So it is printing as d99 but it will not arise an error.

Q: How many types of macros are there in c++?

There are two types of macros. They are object-like and function-like.

Q: What is the use of Namespace?

The main aim of the namespace is to understand the logical units of the program and to make the program so robust.

Q: What do you mean by inline function?

An inline function is a function that is expanded inline when invokedie the compiler replaces the function call with the corresponding function code An inline function is a function that is expanded in line when it is invoked That is the compiler replaces the function call with the corresponding function code (similar to macro)

Q: A special member function of a class, which is invoked automatically whenever an object goes out of the scope is called

Destructor is a special member function of a class, which is invoked automatically whenever an object goes out of the scope. It has the same name as its class with a tilde character prefixed.

Question 1

Default constructor accepts how many arguments?

Accepted Answer

Default constructors has no arguments

Question 2

Where is the reference stored?

Accepted Answer

Referencee is stored in stack

Question 3

How variable declaration in c++ differs that in c?

Accepted Answer

C requires all the variables to be declared at the beginning of a scope but in c++ we can declare variables anywhere in the scope This makes the programmer easier to understand because the variables are declared in the context of their use

Question 4

What is friend function?

Accepted Answer

The function declaration should be preceded by the keyword friendThe function definitions does not use either the keyword or the scope operator :: The functions that are declared with the keyword friend as friend functionThus, a friend function is an ordinary function or a member of another class

Question 5

What is the output of this program? #include using namespace std; struct sec { int a; char b; }; int main() { struct sec s ={25,50}; struct sec *ps =(struct sec *)&s; cout << ps->a << ps->b; return 0; }

Accepted Answer

In this program, We are dividing the values of a and b, printing it.

Question 6

What are the mandatory part to present in function pointers?

Accepted Answer

The data types are mandatory for declaring the variables in the function pointers.

Question 7

What is the output of this program ? #include using namespace std; int n(char, int); int (*p) (char, int) = n; int main() { (*p)('d', 9); p(10, 9); return 0; } int n(char c, int i) { cout << c << i; return 0; }

Accepted Answer

In this program, we have declared the values as integer instead of character, So it is printing as d99 but it will not arise an error.

Question 8

which keyword is used to define the macros in c++?

Accepted Answer

#define

Question 9

How many types of macros are there in c++?

Accepted Answer

There are two types of macros. They are object-like and function-like.

Question 10

What is the use of Namespace?

Accepted Answer

The main aim of the namespace is to understand the logical units of the program and to make the program so robust.

Question 11

What is the general syntax for accessing the namespace variable?

Accepted Answer

namespaceid::operator

Question 12

What is the user-defined header file extension in c++?

Accepted Answer

h

Question 13

What do you mean by inline function?

Accepted Answer

An inline function is a function that is expanded inline when invokedie the compiler replaces the function call with the corresponding function code An inline function is a function that is expanded in line when it is invoked That is the compiler replaces the function call with the corresponding function code (similar to macro)

Question 14

A special member function of a class, which is invoked automatically whenever an object goes out of the scope is called

Accepted Answer

Destructor is a special member function of a class, which is invoked automatically whenever an object goes out of the scope. It has the same name as its class with a tilde character prefixed.

Question 15

Which of the following can derived class inherit?

Accepted Answer

both a & b

Question 16

What is meant by pure virtual function?

Accepted Answer

As the name itself implies, it have to depend on other class only.

Question 17

What does inheriatance allows you to do?

Accepted Answer

create a hierarchy of classes

Question 18

How many types of constructor are there in C++?

Accepted Answer

There are three types of constructor in C++. They are Default constructor, Parameterized constructor, Copy constructor.

Question 19

What is a template?

Accepted Answer

A template is a formula for creating a generic class

Question 20

What is meant by template specialization?

Accepted Answer

In the template specialization, it will make the template to be specific for some data types.

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