THINK++ — Engineering Visualized

Visibility

Variable Scope

Scope defines the region of a program where a variable is visible and accessible. It prevents naming conflicts and manages memory efficiently.

LOCAL SCOPE

Variables declared inside a function or block { }. Destroyed when the block exits.

GLOBAL SCOPE

Variables declared outside all functions. Accessible throughout the entire program's lifetime.

Scope Resolution Operator

Use :: to access a global variable if a local variable with the same name exists in the current scope.

cout << ::x; // accesses global x

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