(Interview) Frequently Ask Question on C/C++/Algorithm

C++: Libraries

• What are the differences between math.h and cmath?

C++: Common & Differences with C

• What are the real differences between C and C++?

• How do I switch from C to C++?

• How to use extern in C/C++?

• Can I use malloc/free instead of new/delete in C++?

• How to use mixed c and c++ code?

• Why some of my enum related code works fine in C, but not compilable in C++?

• Are pass-by-reference and pass-by-pointer the same thing in C++? I disassembled some code and got same assembly code.

C++: static in C/C++

• How does static local variable works in C/C++?

• What does static function mean in C? Can you give an example?

• What does static member function differ from regular member functions in C++?

• Can derived class inherited the static member functions in base class? How do we invode static member functions?

C++: Namespace

• What is namespace, how to use "using namespace std;"?

• Can you give a namespace example?

• Can you give another namespace example?

C++:const and mutable

• Why should we use macro or const to replace number or string literals?

• How to use const in function declaration in C++?

• Can const function modify mutable data member in C++?

• Is defining member function const necessary?

• How to initialize const data members in a struct in c/c++?

• How to modify pointer or reference as const?

C++: Object Oriented Aspect

• Pointer value and << operator overloading in C++?

• What does explicit keyword mean? Can you give an example?

• When should I use explicit?

• When subclass overloaded the function name in superclass, how to make the superclass one(s) still available?

• Can you give a simple operator overloading example?

• Another simple operator overloading example

• What is virtual inheritance? Why do we need virtual inheritance?

• What is pure virtual function? Why do we need them?

• What is abstract class in C++? Is that the same in Java?

• What is polymorphism? Can you give an example?

• If a class constructor is protected, can we construct an object of that class?

• What is the constructor/destructor calling order along the hierarchy?

• Why copy constructor can only pass-by-reference?

• Whsat are deep/shalow copy constructor means, can you give some examples?

• Can you explain the virtual destructor?

• More about virtual destructor

• Can C++ have inner class similar to Java?

C++: Memory & Memory Leak

• Why I deleted a pointer, then use it, I still get the same data?

• If two pointers point to the same object, when I delete one, does that release the memory?

• Why am I not allowed to define a data member of class/struct Node as the Node itself?

• Can I use a pointer to class/struct Node as a data member in the above question?

• Does compiler or linker check infinite recursion for me?

• How to avoid and fix memory leak in C/C++?

C++: Template

• Can you give a simplest template example?

• Should we always use pass by reference like the template example above?

• How to get an array size easily?

• Can we declare a class template in a header file?

C++: Miscellaneous

• Can you give a simple example of inputting 100 floating numbers?

• Can you give an example of using ios::tie() function?

• How to get formated output in C++, when I use cout?

• Can you help me on pointer in C++?

• Can you give a simple exception handling example in C++?

• Can you give an exception handling example using set_unexpected in C++?

• How to communicate between Java and C++?

• What is balanced tree? Do the two subtree need to be the same height?

• Is C++ always faster than Java

COURTESY: http://bobcat.webappcabaret.net