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21. 

A __________ is a constructor that either has no parameters, or if it has parameters, all the parameters have default values.
A. default constructor
B. copy constructor
C. Both A and B
D. None of these
22. 

How many default constructors per class are possible?
A. Only one
B. Two
C. Three
D. Unlimited
23. 

Which of the following statement is correct about destructors?
A. A destructor has void return type.
B. A destructor has integer return type.
C. A destructor has no return type.
D. A destructors return type is always same as that of main().
24. 

Which of the following implicitly creates a default constructor when the programmer does not explicitly define at least one constructor for a class?
A. Preprocessor
B. Linker
C. Loader
D. Compiler
25. 

A destructor takes __________ arguments.
A. one
B. two
C. three
D. no