In c++ have a default constructor?

If you do not define a constructor, the compiler will define a default constructor for you. The implementation of this default constructor is: default construct the base class (if the base class does not have a default constructor, this is a compilation failure) default construct each member variable in the order of declaration. (If a member does not have a default constructor, this is a compilation failure). Note: The POD data (int,float,pointer, etc.) do not have an explicit constructor but the default action is to do nothing (in the vane of C++ philosophy; we do not want to pay for something unless we explicitly ask for it). If no destructor/copy Constructor/Assignment operator is defined the compiler builds one of those for you (so a class always has a destructor/Copy Constructor/Assignment Operator (unless you cheat and explicitly declare one but don't define it)). The default implementation is: Destructor: If user-defined destructor is defined, execute the code provided. Call the destructor of each member in reverse order of declaration Call the destructor of the base class. Copy Constructor: Call the Base class Copy Constructor. Call the copy constructor for each member variable in the order of declaration. Assignment Operator: Call the base class assignment operator Call the assignment operator of each member variable in the order of declaration. Return a reference to this. Note Copy Construction/Assignment operator of POD Data is just copying the data (Hence the shallow copy problem associated with RAW pointers). read less