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Possible Duplicate:
What do the following phrases mean in C++: zero-, default- and value-initialization?
There are multiple places where people have said that an explicit call to the class constructor results in value initialization [when no used-defined constructors exist] and that this is not done by the default constructor [which is a do-nothing constructor] but is something completely different.
What happens actually if no constructor is called OR What is value initialization in this case ?
A constructor for a class-type is always called when an object is constructed, be it user-defined or compiler-generated. The object is initialized, but the members can remain un-initialized. This makes the second part of the question obsolete.
The all-mighty standard.