Integers¶
There are five signed integer types, and five unsigned integer types:
| Type | Length | Minimum Value | Maximum Value |
|---|---|---|---|
| Int8 | 8 | -128 | 127 |
| Int16 | 16 | −32,768 | 32,767 |
| Int32 | 32 | −2,147,483,648 | 2,147,483,647 |
| Int64 | 64 | −263 | 263 - 1 |
| Int128 | 128 | −2127 | 2127 - 1 |
| UInt8 | 8 | 0 | 255 |
| UInt16 | 16 | 0 | 65,535 |
| UInt32 | 32 | 0 | 4,294,967,295 |
| UInt64 | 64 | 0 | 264 - 1 |
| UInt128 | 128 | 0 | 2128 - 1 |
An integer literal is an optional + or - sign, followed by
a sequence of digits and underscores, optionally followed by a suffix.
If no suffix is present, the literal's type is Int32 if the value fits into Int32's range,
and Int64 otherwise. Integers outside Int64's range must always be suffixed:
1 # Int32
1_i8 # Int8
1_i16 # Int16
1_i32 # Int32
1_i64 # Int64
1_i128 # Int128
1_u8 # UInt8
1_u16 # UInt16
1_u32 # UInt32
1_u64 # UInt64
1_u128 # UInt128
+10 # Int32
-20 # Int32
2147483647 # Int32
2147483648 # Int64
-2147483648 # Int32
-2147483649 # Int64
9223372036854775807 # Int64
9223372036854775808_u64 # UInt64
Suffix-less integer literals larger than Int64's maximum value but representable within
UInt64's range are deprecated, e.g. 9223372036854775808.
The underscore _ before the suffix is optional.
Underscores can be used to make some numbers more readable:
1_000_000 # better than 1000000
Binary numbers start with 0b:
0b1101 # == 13
Octal numbers start with a 0o:
0o123 # == 83
Hexadecimal numbers start with 0x:
0xFE012D # == 16646445
0xfe012d # == 16646445