C++ Interview Questions and Answers

C++	Which of the following are good reasons to use an object oriented language?	You can define your data types	Program statements are simpler than in procedural languages.	An OO program can be taught to correct its own errors.	It's easier to conceptualize an OO program.	A
C++	When a language has the capacity to produce new data type, it is said to be	Reprehensible	Encapsulated	Overload	Extensible	D
C++	A normal C++ operator that acts in a special way on newly defined data types is said to be	Glorified	Encapsulated	Classified	Overloaded	D
C++	main() returns a value of type	real	char	int	null	C
C++	Sharing of common information are achieved by the concept of	Virtual copying	Inheritance	Encapsulation	None of these	B
C++	In a for loop with a multi-statement loop body, semicolons should appear following	The for statement itself	The closing brace in a multi-statement loop body	Each statement within the loop body.	The test expression	C
C++	A variable defined within a block is visible	From the point of definition onwards in the program	From the point of definition onwards in the function	From the point of definition onwards in the block	Throughout the function	C
C++	The library function exit() causes an exit from	The loop in which it occurs	The block in which it occurs	The function in which it occurs	The program in which it occurs	D
C++	The getch() library function	Returns a character when any key is pressed	Returns a character when ENTER is pressed	Display a character on the screen when a key is pressed	Does not display a character on the screen	A
C++	_______ argument(s) are passed in case of binary overloaded operators.	Two	One	No	None of the above	A
C++	_______ argument(s) are passed in case of unary overloaded operators.	Two	One	No	None of the above	B
C++	The && and \|\| operators	Compare two numeric values	Combine two numeric values	Compare two Boolean values	Combine two Boolean values	C
C++	The break statement causes an exit	Only from the innermost loop	Only from the innermost switch	From all loops and switch	Only from the innermost loops or switch	A
C++	When accessing a structure member, the identifier to the left of the dot operator is the name of	Structure member	Structure tag	Structure variable	The keyword struct.	C
C++	cc ___________ option is used only to create object file	-a	-o	-c	none of these	B
C++	:: is known as	scope resolution operator	global operator	Both (a) & (b)	None of these	A
C++	Which of the following can legitimately be passed to a function?	A constant	A variable	A structure	A header file	B
C++	_____________ operator must have one class object	+	new	all	None of these	B
C++	Overloaded functions	Are a group of functions with the same name	All have the same number and types of arguments	Make life simpler for programmer	May fail unexpectedly due to stress	A
C++	In C++, the stream base class is	iostream	iofstream	ios	stdio	C
C++	The template function declaration specifies	template class	a generic class	exception	identifier	B
C++	In C++, the exception handler is invoked with a-	try block	throw exception	catch function	abort()	B
C++	The exception is processed using	unexpected()	perform()	catch()	try()	C
C++	A member function can always access the data	In the object of which it is a member	In the class of which it is a member	In the object of the class of which it is a member	In the public part of its class	B
C++	Classes are useful because they	Are removed from memory when not in use	Permit data to be hidden from other classes	Bring together all aspects of an entity in one place	Can closely model objects in the real world	B
C++	Element double Array[7] is which element of the array?	sixth	seventh	eighth	impossible to tell	C
C++	You can read input that consists of multiple lines of text using	The normal cout<<>	The cin.get() function with one argument	The cin.get() function with two argument	The cin.get() function with three argument	C
C++	Operator overloading is	Making C++ operators work with objects	Making C++ operators more then they can handle	Giving new meaning to existing c++ operators	Making new C++ operators	C
C++	Private data members can be accessed	Only from the base class itself	Both from the base class and form its derived classes	From the class which is a friend of the base class	None of the above is correct	AC
C++	Protected data members can be accessed	Only from the base class itself	Both form the base class and from its derived classes	From the class which is friend of the base class	None of the above are correct	B
C++	Public data members can be accessed	Only from the base class itself	Both form the base class and from its derived classes	From the class which is friend of the base class	None of the above are correct	B
C++	When you overload an arithmetic assignment operator, the result	Goes in the object to the right of the operator	Goes in the object to the left of the operator	Goes in the object of which the operator is a member	Must be returned	B
C++	new operator is used	To dynamically allocate storage	To statically allocate storage	To allocate storage for a new variable	None of the above are correct	C
C++	Delete operator is used	To allocate storage	To deallocate storage	To delete variable name	None of the above are correct	B
C++	Class members are _______________ by default	Private	protected	public	None of the above are correct	A
C++	Friend function have access to the	private and protected members	public members only	private members only	None of the above are correct	B
C++	Inline functions_____________ call overload.	Increase	Reduce	None of the above are correct		B
C++	The characteristic that data can be manipulated only through member functions that are part of the class is called	Encapsulation	Data dependency	Inheritance	Instantiation	A
C++	In a class, only the member function can access data, which is not accessible to outside. This feature is called:	Data security	Data hiding	Data manipulation	Data definition	B
C++	The scope resolution operator is -	::	;	<<	->	A
C++	The signature of a function is	The return type	The number and type of arguments	The class of a function	None of the above	D
C++	Pick out the most appropriate statement	All variables must be declared before they are used	Variables in C++ need not be declared and the type can be assigned dynamically	Variables in C++ can be declared at the end of the program (before the main function terminates)	Variables can not be used explicitly in C++	A
C++	What is the value of Friday in the following - enum days { Monday, Tuesday, Wednesday = -1, Thursday, Friday, Saturday = 6, Sunday}	1	5	0	-3	A
C++	What is the output of the following program segment - for(i = 1, j = 0; i < 10; i++) j += i; cout <	10	20	55	there is an error in the program	A
C++	The string table in C++ holds the	string constants in your program	program statements in string form	variables whose type is of string	none of the above	A
C++	The declaration int **var1; shows that	var1 can not be accessed	var1 is a pointer to a pointer of type int	var1 is a protected data type of integer	this type declaration shows an error	B
C++	In C++, the keyword auto can be used for	Automatic assignment of data to object during instantiation	Automatic call of a function	To declare a local variable	It is not a keyword in C++	C
C++	By default, C++ uses the following method of passing arguments	Call-by-Reference	Call-by-Value	Call-by-Pointer	None of the above	B
C++	Pick out the most appropriate statement from the following	references are pointers	array of references can be created	you can not reference a reference variable	all of the above	C
C++	The ?: can be used to replace	if-else statement	wild cards	no meaning in C++	returns the value	A
C++	Dynamic memory can be allocated by the following declaration	new	volatile	static	==	A
C++	The member of a structure can be directly accessed by	->	dot operator	::	>>	B
C++	The member of a structure can be accessed through a pointer by	->	dot operator	::	>>	A
C++	The members of a class can be made private by	declaring them private	by default they are private	by declaring them in the beginning of the program immediately after main()	they are always public	AB
C++	A function that is called automatically when an object is created is known as	instantiation	function prototype	constructor	structure	C
C++	A function that is called automatically when an object is destroyed is known as	instantiation	function prototype	constructor	destructor	D
C++	It is possible to allow non member function access to private members of a class by declaring it as	public	friend	private	not possible	B
C++	When one object initializes another object the following function is invoked	copy constructor	new	instantiation	none of the above	A
C++	A base class is inherited by	derived class	inline function	constructor	none of the above	A
C++	By using protected, one can create class members that are private to their class but	that can not be inherited and accessed by a derived class	that can still be inherited and accessed by a derived class	that can be public	none of the above	B
C++	A pure virtual function is a virtual function that has	no definition in its base class	a definition in its base class	a definition in at least one derived class	definition in base class and at least one derived class	A
C++	A class that contains at least one pure virtual function is called as	pure class	abstract class	base class	derived class	B
C++	The binding that binds a function call at run time is called	early binding	run time binding	late binding	linking	C
C++	One of the major disadvantage with late binding is	the source code should be made available at compile time	the program runs slower	dynamic variables can not be used in the program	static variables can not be used	B
C++	One of the important features of an abstract class is	it need not have any object	it should be used only as a derived class	it need not have any members	none of the above	A
C++	Organizing data with methods that operate on the data and creating a new data type is called encapsulation.	True	False			A
C++	Class is similar to a variable.	True	False			B
C++	By default, members cannot be inherited.	True	False			A
C++	Protected members cannot be inherited.	True	False			B
C++	Inline function specifier reduces the overheads associated with a normal function call.	True	False			A
C++	The new operator always returns a void pointer.	True	False			A
C++	'this' pointer has to be used while accessing data members in a member function.	True	False			A
C++	In C++, identifiers have to be declared at the beginning of the blocks.	True	False			A
C++	In C++, an identifier must be initialized using constant expression.	True	False			B
C++	Data objects can be initialized when allocating memory using 'new'.	True	False			A
C++	Scope resolution operator has the highest precedence.	True	False			A
C++	Reference to an object behaves like a constant pointer.	True	False			B
C++	We can make function inline by using the keyword 'inline'.	True	False			A
C++	Private members of a structure can be accessed directly from the outside of the structure.	True	False			B
C++	The following syntax is valid. void inline gram_ panchayat :: show_gram_ panchayat_info().	True	False			B
C++	"[]" Operator is a unary operator.	True	False			A
C++	The members of a class by default are private.	True	False			A
C++	An object is an allocated space in memory.	True	False			A
C++	Constructor returns void type value.	True	False			B
C++	A copy constructor is used to copy an object member wise to another object of the same class.	True	False			A
C++	Member function cannot be called from within a constructor.	True	False			A
C++	We cannot have the address of a constructor.	True	False			A
C++	A constructor cannot be explicitly called.	True	False			A
C++	A destructor can have arguments like constructor.	True	False			B
C++	A destructor can have a return type.	True	False			B
C++	Objects get destroyed in the reverse order as they are created.	True	False			A
C++	'this' is an implicit pointer.	True	False			A
C++	The value of 'this' pointer can be changed.	True	False			B
C++	In case of nested class, enclosing class can directly access the private data member of nested class.	True	False			A
C++	ios containes a pointer to streambuf.	True	False			A
C++	iostream is inheried from istream, ostream and ios class.	True	False			B
C++	Static member functions have file scope.	True	False			A
C++	Static data member occurs in only class scope.	True	False			B
C++	Static data member can be declared as const too.	True	False			A
C++	If a friend function is declared inside a class it can access all data members of the class.	True	False			A

C++ Interview Questions and Answers - FAQ

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