Rust has four primary scalar types:

• Integers
• Floating-Point Numbers
• Booleans
• Characters

Integer Types

Integer Types

Length	Signed	Unsigned
8-bit	i8	u8
16-bit	i16	u16
32-bit	i32	u32
64-bit	i64	u64
128-bit	i128	u128
arch*	isize	usize

The "arch" length is system architecture dependent.

Integer Literals

Number Literals	Example
Decimal	12_345_678
Hex	0xfe
Octal	0o76
Binary	0b1111_0000
Byte (u8 only)	b'A'

Floating-Point Types

Floating-Point Types

Length	Type
32-bit	f32
64-bit	f64

Note: Rust defaults all floats to f64.

The Boolean Type

A boolean in Rust is either true or false and takes up one byte. The type is specified with bool.

The Character Type

The character type in Rust is a four byte Unicode Scalar Value. For example:

fn main() {
    let c = 'z';
    let z = 'ℤ';
    let laughing_crying_face = '😂';
}