### 7.4 Arithmetic Operators

The arithmetic operators take numeric operands and produce numeric
results.

`a`` + `

`b`- Yields the sum of
`a` and `b`.

`a`` - `

`b`- Subtracts
`b` from `a` and yields the difference.

`a`` * `

`b`- Yields the product of
`a` and `b`. If either `a` or
`b` is 0, then the result is 0, even if the other operand is
missing.

`a`` / `

`b`- Divides
`a` by `b` and yields the quotient. If `a` is 0,
then the result is 0, even if `b` is missing. If `b` is zero,
the result is system-missing.

`a`` ** `

`b`- Yields the result of raising
`a` to the power `b`. If
`a` is negative and `b` is not an integer, the result is
system-missing. The result of `0**0`

is system-missing as well.

`- `

`a`- Reverses the sign of
`a`.