Micro-Topic 4.1: Declaring Variables and Naming Rules
Micro-Topic 4.2: Primitive Numeric Types (Integers)
Micro-Topic 4.3: Floating-Point Types and Precision
Micro-Topic 4.4: The char and boolean Types
Micro-Topic 4.5: Reference Types and Object References
Micro-Topic 4.6: Type Conversion and Casting