Constant Member Functions MCQ

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• Use of const member function in a program _________________________
  ক

  Is mandatory, always

  খ

  Is optional, always

  গ

  Is mandatory, if objects are used

  ঘ

  Is optional, if const objects are used
• Which among the following is recommended for const functions?
  ক

  Const function use should be reduced in a program

  খ

  Const function use should be more in a program

  গ

  Const function use should not matter in a program

  ঘ

  Const function use should be able to modify the values
• If const version of a function when overloading is used, the function ___________________
  ক

  Returns reference to object

  খ

  Returns volatile reference

  গ

  Returns mutable reference

  ঘ

  Returns const reference
• Functions which differ in const-ness are considered ______________________
  ক

  To have same signature

  খ

  To have different signature

  গ

  To produce compile time error

  ঘ

  To produce runtime error
• If a function is to be made const, which is the correct syntax?
  ক

  const functionName(parameters);

  খ

  const returnType functionName(parameters);

  গ

  const functionName(returnType)(Parameters);

  ঘ

  const (functionName(parameters));
• When both the const and non-const version of functions are required?
  ক

  Return value have to be different in const

  খ

  Return value have to be same in const

  গ

  Return values have to be ignored

  ঘ

  Return values have to be suppressed
• How is it possible to have both const and non-const version of a function?
  ক

  Function overriding

  খ

  Function prototyping

  গ

  Function overloading

  ঘ

  Function declaring
• A function can have both the const and non-const version in the same program.
  ক

  True

  খ

  False
• Can a constructor function be constant?
  ক

  Yes, always

  খ

  Yes, only if permissions are given

  গ

  No, because objects are not involved

  ঘ

  No, never
• If a const object calls a non-const member function then ____________________
  ক

  Run time error may get produced

  খ

  Compile time error may get produced

  গ

  Either compile time or run time error is produced

  ঘ

  The program can’t be compiled
• Which is the correct condition on const member functions?
  ক

  Const member functions can’t call non-const member functions

  খ

  Const member functions can’t call any other function

  গ

  Const member functions can call only the functions which are neither const nor non-const

  ঘ

  Const member functions can call only data members of call not member functions
• Non-const functions _______________________
  ক

  Can be called only from non-const object

  খ

  Can be called only from const object

  গ

  Can be called both by const and non-const object

  ঘ

  Can’t be called with object
• Which objects can call the const functions?
  ক

  Only const objects

  খ

  Only non-const objects

  গ

  Both const and non-const objects

  ঘ

  Neither const not non-const objects
• Which keyword must be used to declare a member function as a constant member function?
  ক

  Constant

  খ

  Const

  গ

  FunctionConst

  ঘ

  Unchanged
• What are the constant member functions?
  ক

  Functions which doesn’t change value of calling object

  খ

  Functions which doesn’t change value of any object inside definition

  গ

  Functions which doesn’t allow modification of any object of class

  ঘ

  Functions which doesn’t allow modification of argument objects