In the Book C++ Primer by Stanley B. Lippman*,* Josée Lajoie
in Chapter 14.2 of Class Constructors it states:
Should we also provide support for specifying an opening balance but no client name? As it happens, the class specification disallows this explicitly. Our two-parameter constructor with a default second argument provides a complete interface for accepting initial values for the data members of class Account that can be set by the user:
class Account { public: // default constructor ... Account(); // parameter names are not necessary in declaration Account( const char*, double=0.0 ); const char* name() { return _name; } // What is this for?? // ... private: // ... }; The following are both legal Account class object definitions passing one or two arguments to our constructor:
int main() { // ok: both invoke two-parameter constructor Account acct( "Ethan Stern" ); How does this Invoke the 2-parameter constructor when it has not been declared with single argument??
Account *pact = new Account( "Michael Lieberman", 5000 ); And how does the above line call the constructor with default arguments
if ( strcmp( acct.name(), pact->name() )) // ... } The book seems to be highly unclear with incomplete codes. Need a good explanation on Constructors. Please clarify.
