`make-fpexpt``x`procedure- x
- number

Equivalent to

`(λ (y) (fpexpt x y))`when`x`is a flonum, but much more accurate for large`y`when`x`cannot be exactly represented by a flonum.Suppose we want to compute {{π^y}}, where

`y`is a flonum. If we use flexpt with an approximation of the irrational base {{π}}, the error is low near zero, but grows with distance from the origin. Using`make-fpexpt`, the error is near rounding error everywhere.