References in C++

Which of the following statement is true about the references?

• Defining a reference variable allocates a separate memory.

• Reference variable can point to any variable once it is initialized

• Reference to an object creates a copy

• Reference variable must be initialized to NULL

A reference variable must be initialized to null

• True

• False

True Or False

A reference variable can point to any variable once initialized

• True

• False

A reference variable must be initialized to ___________

• null

• 0

• variable

• address of a variable

What is the output of the below code snippet?

int a=10;

int b=20;

int &ref=a;

int *ptr=&b;

ref += *ptr;

ref++;

cout<<a<<"\t"<<b;

• 10 20

• 20 10

• 31 20

• 20 31

What is the output of the below code snippet?

int a=1000;

float &b=a;

b++;

cout<<a;

• 1000

• 1001

• Prints the address of the variable a

• Compilation error

A friend function can be declared under which access specifier

• Private

• Protected

• Public

• All

Which of the below statements are true about the friend function

• Has access to all the members of the class

• Must be defined globally

• Is a member of the class

• Cannot access the private members of a class

Can an external function be made friend to more than one class

• Yes

• No

Identify the correct syntax to declare a friend function

• friend <Return Type> <Function Name>([Optional params])

• <Return Type> friend <Function Name> ([Optional params])

• void friend <Function Name> ([Optional params])

• None of the above