Add Rhai book.

2020-06-20 12:06:17 +08:00
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--- a/doc/src/language/num-op.md
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+Numeric Operators
+=================
+
+{{#include ../links.md}}
+
+Numeric operators generally follow C styles.
+
+Unary Operators
+---------------
+
+| Operator | Description |
+| -------- | ----------- |
+| `+`      | Plus        |
+| `-`      | Negative    |
+
+```rust
+let number = -5;
+
+number = -5 - +5;
+```
+
+Binary Operators
+----------------
+
+| Operator | Description                                          | Integers only |
+| -------- | ---------------------------------------------------- | :-----------: |
+| `+`      | Plus                                                 |               |
+| `-`      | Minus                                                |               |
+| `*`      | Multiply                                             |               |
+| `/`      | Divide (integer division if acting on integer types) |               |
+| `%`      | Modulo (remainder)                                   |               |
+| `~`      | Power                                                |               |
+| `&`      | Binary _And_ bit-mask                                |      Yes      |
+| `\|`     | Binary _Or_ bit-mask                                 |      Yes      |
+| `^`      | Binary _Xor_ bit-mask                                |      Yes      |
+| `<<`     | Left bit-shift                                       |      Yes      |
+| `>>`     | Right bit-shift                                      |      Yes      |
+
+```rust
+let x = (1 + 2) * (6 - 4) / 2;  // arithmetic, with parentheses
+
+let reminder = 42 % 10;         // modulo
+
+let power = 42 ~ 2;             // power (i64 and f64 only)
+
+let left_shifted = 42 << 3;     // left shift
+
+let right_shifted = 42 >> 3;    // right shift
+
+let bit_op = 42 | 99;           // bit masking
+```