Numeric types
Integer types
The unsigned integer types consist of:
| Type | Minimum | Maximum |
|---|---|---|
u8 | 0 | 28-1 |
u16 | 0 | 216-1 |
u32 | 0 | 232-1 |
u64 | 0 | 264-1 |
u128 | 0 | 2128-1 |
The signed two's complement integer types consist of:
| Type | Minimum | Maximum |
|---|---|---|
i8 | -(27) | 27-1 |
i16 | -(215) | 215-1 |
i32 | -(231) | 231-1 |
i64 | -(263) | 263-1 |
i128 | -(2127) | 2127-1 |
Floating-point types
The IEEE 754-2008 "binary32" and "binary64" floating-point types are f32 and
f64, respectively.
Machine-dependent integer types
The usize type is an unsigned integer type with the same number of bits as the
platform's pointer type. It can represent every memory address in the process.
The isize type is a signed integer type with the same number of bits as the
platform's pointer type. The theoretical upper bound on object and array size
is the maximum isize value. This ensures that isize can be used to calculate
differences between pointers into an object or array and can address every byte
within an object along with one byte past the end.