Lua supports the usual arithmetic operators:
the binary `+`

(addition),
`-`

(subtraction), `*`

(multiplication),
`/`

(division), `%`

(modulo), and `^`

(exponentiation);
and unary `-`

(negation).
If the operands are numbers, or strings that can be converted to
numbers (see Coercion),
then all operations have the usual meaning.
Exponentiation works for any exponent.
For instance, `x^(-0.5)`

computes the inverse of the square root of `x`

.
Modulo is defined as

a % b == a - math.floor(a/b)*b

That is, it is the remainder of a division that rounds the quotient towards minus infinity.

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