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Variables & Data Types
Last Updated: May 22, 2026
High Priority
10 min read
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On this page
What a Variable Is
The Variable Lifecycle
Declaration vs Definition vs Initialization
Three Ways to Initialize
The Assignment Operator
C++ Is Statically Typed
The auto Keyword
How the Compiler Picks a Type from Literals
C++'s Type System at a Glance
Scope: Where a Variable Is Visible
Putting It Together
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Compilation Process
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Constants & Literals
