A namespace is a collection of name definitions such as class definitions,variable definitions and function definitions used to permit the same name,or names,to be used both in a library and in your own code.
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Q3: In C++,a compilation unit is a class
Q4: Namespaces may not be nested.
Q5: During name resolution,nested namespaces behave like nested
Q6: Any global declarations or definitions can be
Q7: The scope of a using directive or
Q9: A namespace grouping requires a semicolon after
Q10: You can use #define to define a
Q11: Namespaces can be defined in pieces across
Q12: If I have already written the #include
Q13: A namespace is just a class with
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