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Variables, Mutability, and Basic Types in Rust

In Rust every value has a type known at compile time, and every variable is read-only unless you mark it mutable. Number types state their exact width and sign, like a 32-bit unsigned integer, so you always know how many bits you are moving. This is what lets you write code that matches a hardware register exactly instead of hoping the compiler picked the right size.

Questions this Concept answers

Why does Rust name integer widths explicitly, writing `u32` rather than a generic integer keyword?

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Mutability, Type Casting, Shadowing, and Unused Variables in Rust

Rust's type system supports local type inference (types are deduced from initialization rather than always declared explicitly), and its variable bindings are immutable by default, requiring an expli…