realpart (ANSI and GNU Common Lisp Document)

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#### 12.2.50 realpart, imagpart [Function]

`realpart` number ⇒ real

`imagpart` number ⇒ real

#### Arguments and Values::

number—a number.

real—a real.

#### Description::

realpart and imagpart return the real and imaginary parts of number respectively. If number is

real,

then realpart returns number and imagpart returns `(* 0 number)`, which has the effect that the imaginary part of a rational is `0` and that of a float is a floating-point zero of the same format.

#### Examples::

     (realpart #c(23 41)) ⇒  23
     (imagpart #c(23 41.0)) ⇒  41.0
     (realpart #c(23 41.0)) ⇒  23.0
     (imagpart 23.0) ⇒  0.0

#### Exceptional Situations::

Should signal an error of type type-error if number is not a number.

#### See Also::

complex