Major Section: PROGRAMMING

`(Expt r i)`

is the result of raising the number `r`

to the
integer power `i`

.

The guard for `(expt r i)`

is that `r`

is a number and `i`

is an integer, and furthermore, if `r`

is `0`

then `i`

is
nonnegative. When the type requirements of the guard aren't
met, `(expt r i)`

first coerces `r`

to a number and `i`

to an
integer.

`Expt`

is a Common Lisp function. See any Common Lisp
documentation for more information. Note that `r`

can be a complex
number; this is consistent with Common lisp.