C++ Objective Questions

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

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