Scalar Data types

Integer

Size	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

Float

Size	Float
32 bit	f32
64 bit	f64

Type Casting 类型转换

let pi: f32 = 4;    // mismatched types error

Number separator

let million: i32 = 1_000_000;
println!("{}", million);

Boolean

let is_day = true;
println!("is_day {}", is_day);
let is_night = false;
println!("is_night {}", is_night);

Character

let char1 = 'A';
println!("char1 {}", char1);
let smiley_face = '\u{1F601}';
println!("smiley_face {}", smiley_face);