Add Rhai book.

2020-06-20 12:06:17 +08:00
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--- a/doc/src/language/numbers.md
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+Numbers
+=======
+
+{{#include ../links.md}}
+
+Integer numbers follow C-style format with support for decimal, binary ('`0b`'), octal ('`0o`') and hex ('`0x`') notations.
+
+The default system integer type (also aliased to `INT`) is `i64`. It can be turned into `i32` via the [`only_i32`] feature.
+
+Floating-point numbers are also supported if not disabled with [`no_float`]. The default system floating-point type is `i64`
+(also aliased to `FLOAT`).
+
+'`_`' separators can be added freely and are ignored within a number.
+
+| Format           | Type             |
+| ---------------- | ---------------- |
+| `123_345`, `-42` | `i64` in decimal |
+| `0o07_76`        | `i64` in octal   |
+| `0xabcd_ef`      | `i64` in hex     |
+| `0b0101_1001`    | `i64` in binary  |
+| `123_456.789`    | `f64`            |