Free Test Pointers to objects an... – C++ Lan...

Q1: How do you declare a pointer to an object of class MyClass?

A. MyClass *ptr; B. MyClass ptr*; C. *MyClass ptr; D. ptr MyClass*;

Q2: How do you access an object member using a pointer?

A. ptr->member B. *ptr.member C. ptr.member D. ptr*member

Q3: What is the syntax to declare a pointer to a member function?

A. ReturnType (ClassName::*ptr)(ParameterTypes); B. ReturnType *ptr(ClassName)(ParameterTypes); C. ClassName ReturnType::*ptr(ParameterTypes); D. ReturnType (ClassName* ptr)(ParameterTypes);

Q4: How to invoke a member function via pointer to member function?

A. (object.*ptr)(arguments); B. object.ptr(arguments); C. *object.ptr(arguments); D. ptr(object)(arguments);

Q5: How do you call a member function pointer via pointer to object?

A. (ptr->*funcPtr)(args); B. *ptr.funcPtr(args); C. ptr.funcPtr(args); D. ptr->funcPtr(args);

Q6: Can pointers to member functions be assigned to regular function pointers?

A. No, they have different types B. Yes, always C. Only if static functions D. Only if void return type

Q7: What is the size of a pointer to member function?

A. Depends on compiler, usually larger than regular pointers B. Always 4 bytes C. Always 8 bytes D. Always 2 bytes

Q8: Are pointers to members valid without an object?

A. No, they must be invoked on an instance B. Yes, always C. Only for static members D. Only for private members

Q9: What keyword is used to declare a pointer to a const member function?

A. const after the function signature B. const before the function C. const inside parameter list D. const after the pointer

Q10: Can you have pointers to static member functions?

A. Yes, like regular function pointers B. No, only non-static C. Only with friend functions D. Only with virtual functions

Q11: How do you assign a pointer to a member function?

A. ptr = &ClassName::FunctionName; B. ptr = ClassName::FunctionName; C. ptr = *ClassName::FunctionName; D. ptr = ClassName.FunctionName;

Q12: Can pointers to member variables be used similarly to pointers to member functions?

A. Yes, with similar syntax but without parentheses B. No, they are different C. Only for static members D. Only for public members

Q13: How do you access a member variable via pointer to member?

A. object.*ptr B. *object.ptr C. object.ptr D. ptr->object

Q14: Can pointer to member functions point to overloaded functions?

A. Yes, but you must specify exact signature B. No, never C. Only for static overloads D. Only for virtual functions

Q15: What is the difference between a pointer to member and a regular pointer?

A. Pointer to member refers to class members, regular pointer points to objects or data B. No difference C. Pointer to member is always null D. Regular pointer cannot point to functions

Q16: What happens if you dereference a null pointer to an object?

A. Undefined behavior, usually crashes B. Returns zero C. Returns default object D. Compiles error

Q17: How do you pass a pointer to an object to a function?

A. void func(MyClass *ptr); B. void func(MyClass ptr); C. void func(*MyClass ptr); D. void func(&MyClass ptr);

Q18: Which of the following is true about pointer to member functions?

A. They require an object to invoke B. They are same as regular function pointers C. They point to static members only D. They are not supported in C++

Q19: Can you assign nullptr to a pointer to member function?

A. Yes, to indicate no function B. No, always invalid C. Only to regular pointers D. Only to pointers to member variables

Quiz for Pointers to objects and member functions