block scope variable « Language Basics « C++ Tutorial

1.6.block scope variable
1.6.1.Variable block scope
1.6.2.Variables can be local to a block
1.6.3.Inner block variable scope
1.6.4.Names in inner scopes can hide names in outer scopes.
1.6.5.Using the scope resolution operator: '::' and block scope
1.6.7.scope code block variables across functions
1.6.9.Using the scope resolution operator (2)