The Complete Rust Programming Reference Guide

Primitive types

Rust has the following built-in primitive types:

• bool: These are the usual booleans and can be either true or false .
• char: Characters, such as e.
• Integer types: These are characterized by the bit width. Rust supports integers that are up to 128 bits wide:

 

signed	unsigned
i8	u8
i16	u16
i32	u32
i64	u64
i128	u128

• isize: The pointer-sized signed integer type. Equivalent to i32 on 32-bit CPU and i64 on 64-bit CPU.
• usize: The pointer-sized unsigned integer type. Equivalent to i32 on 32-bit CPU and i64 on 64-bit CPU.
• f32: The 32-bit floating point type. Implements the IEEE 754 standard for floating point representation.
• f64: The 64-bit floating point type.
• [T; N]: A fixed-size array, for the element type,