# Operators
Ki uses a familiar set of operators.
## Boolean Operators
- and: `&&`
- or: `||`
- equivalent: `==`
- not: `!`
- not equal: `!=`
- less than: `<`
- less than or equal to: `<=`
- greater than: `>`
- greater than or equal to: `>=`
## Mathematical Operators
- add: `+`
- subtract: `-`
- multiply: `*`
- divide: `/`
- modulus: `%`
- exponent: `**`
- increment: `++`
- decrement: `--`
Any of these (save `++` and `--`) can have a `=` appended to the end to assign
the new value. For example:
```ki
fn main() {
var x: 5
x += 11
}
```
`++` and `--` are syntactic sugar for `+= 1` and `-= 1`, i.e. they culminate in
an assignment. As such, they cannot be used in compound expressions, like `y =
x++`. They can also only be used as suffixes, not prefixes.
## Bitwise Operators
- and: `&`
- or: `|`
- not: `~`
- xor: `^`
- shift left: `<<`
- shift right: `>>`
Just as with the mathematical operators, any of these can also have a `=`
appended to the end to assign the new value. For example:
```ki
fn main() {
var x: 5
x <<= 2
}
```