Answer / atul shankhwar

A declaration introduces a name into the program; a definition provides a unique description of an entity (e.g. type, instance, and function). Declarations can be repeated in a given scope, it introduces a name in a given scope. There must be exactly one definition of every object, function or class used in a C++ program.

A declaration is a definition unless:

 it declares a function without specifying its body,
 it contains an extern specifier and no initializer or function body,
 it is the declaration of a static class data member without a class definition,
 it is a class name definition,
 it is a typedef declaration.
A definition is a declaration unless:
 it defines a static class data member,
 it defines a non-inline member function.

Which uses less memory? a) struct astruct { int x; float y; int v; }; b) union aunion { int x; float v; }; c) char array[10];

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