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Jul 13, 2021
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Add note about the sign of the remainder #1073

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8 changes: 5 additions & 3 deletions src/expressions/operator-expr.md
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Expand Up @@ -192,16 +192,18 @@ The operands of all of these operators are evaluated in [value expression contex
| `-` | Subtraction | | Subtraction | `std::ops::Sub` | `std::ops::SubAssign` |
| `*` | Multiplication | | Multiplication | `std::ops::Mul` | `std::ops::MulAssign` |
| `/` | Division* | | Division | `std::ops::Div` | `std::ops::DivAssign` |
| `%` | Remainder | | Remainder | `std::ops::Rem` | `std::ops::RemAssign` |
| `%` | Remainder** | | Remainder | `std::ops::Rem` | `std::ops::RemAssign` |
| `&` | Bitwise AND | [Logical AND] | | `std::ops::BitAnd` | `std::ops::BitAndAssign` |
| <code>&#124;</code> | Bitwise OR | [Logical OR] | | `std::ops::BitOr` | `std::ops::BitOrAssign` |
| `^` | Bitwise XOR | [Logical XOR] | | `std::ops::BitXor` | `std::ops::BitXorAssign` |
| `<<` | Left Shift | | | `std::ops::Shl` | `std::ops::ShlAssign` |
| `>>` | Right Shift** | | | `std::ops::Shr` | `std::ops::ShrAssign` |
| `>>` | Right Shift*** | | | `std::ops::Shr` | `std::ops::ShrAssign` |

\* Integer division rounds towards zero.

\*\* Arithmetic right shift on signed integer types, logical right shift on
\*\* Rust uses a remainder defined with [truncating division](https://en.wikipedia.org/wiki/Modulo_operation#Variants_of_the_definition). Given `remainder = dividend % divisor`, the remainder will have the same sign as the dividend.

\*\*\* Arithmetic right shift on signed integer types, logical right shift on
unsigned integer types.

Here are examples of these operators being used.
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