Scalar Types

Types Literals
Signed integers i8, i16, i32, i64, i128, isize -10, 0, 1_000, 123i64
Unsigned integers u8, u16, u32, u64, u128, usize 0, 123, 10u16
Floating point numbers f32, f64 3.14, -10.0e20, 2f32
Strings &str “foo”, r#”\“#
Unicode scalar values char ‘a’, ‘α’, ‘∞’
Byte strings &[u8] b”abc”, br#” “ “#
Booleans bool true, false

The types have widths as follows:

  • iN, uN, and fN are N bits wide,
  • isize and usize are the width of a pointer,
  • char is 32 bit wide,
  • bool is 8 bit wide.