## complex?: determine if a number is complex

Predicate`complex?`
Parametersn, a number
PurposeDetermines if v is a complex number (including an optional complex part).
ProducesA truth value: true (`#t`) if n is a complex number, false (`#f`) if it's not a complex number.
PreconditionsOnly one parameter (verified).
PostconditionsReturns true if and only if the parameter is a complex number.
Examples
```> (complex? (sqrt -1))
#t
> (complex? 1)
#t
> (complex? 3/2)
#t
> (complex? -1/2)
#t
> (complex? 1.3)
#t
> (complex? (sqrt 2))
#t
> (complex? 'a)
#f
```

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This page was generated by Siteweaver on Thu Feb 22 05:47:52 2001.
This page may be found at `http://www.cs.grinnell.edu/~rebelsky/Courses/CS151/2001S/complex-p.html`.