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# Source for wiki NegativeSqrt version 4

## author

cowan

## comment

## ipnr

127.11.51.1

## name

NegativeSqrt

## readonly

0

## text

This is a test of `(sqrt -1)` to determine various issues: does the value become inexact, and if we don't have complex numbers, do we get an error or a NaN?
Returns exact `+i`: Racket, MIT, Gambit, Chibi, Chez, Vicare, Ypsilon, Mosh, !IronScheme, STklos, Spark, Owl Lisp, Sagittarius
Return inexact `0.0+1.0i`: Gauche, Chicken (with the numbers egg), Scheme48/scsh, Guile, Kawa, SISC, SCM, Larceny, KSi, S7, UMB, Foment
Returns `+nan.0`: Chicken (without the numbers egg), NexJ, JScheme, RScheme, BDC, VX, Inlab, Picrin
Signals an error: Bigloo, Ikarus, Scheme 9, XLisp, Rep, Schemik, Elk, SXM, Sizzle, Dfsch
`sqrt` is undefined: !SigScheme, Shoe, !TinyScheme, Llava, Oaklisp, !FemtoLisp
Dream hangs.
A further test of `(sqrt -1.0)` produces `0.0+1.0i`, `+nan.0`, or an error consistently with the above.

## time

2015-07-06 00:36:50

## version

4