5. Scope of variables

• C++ variables, functions, and classes are placed in a scope.

• Scope determines visibility and lifetime of a variable.

• C comes with:

  • global scope outside functions (global namespace)

  • local scope inside functions

  • code blocks also have their own scope.

• In C++, classes provide a scope nested inside the global scope.

• Class scopes can be referred to by name using the :: operator.

• Member functions themselves are in the class scope.

• Member function bodies have the local scope.