CLHS: Function REALPART, IMAGPART

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Function REALPART, IMAGPART

Syntax:

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

Side Effects: None.

Affected By: None.

Exceptional Situations:

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

See Also:

complex

Notes: None.

The following X3J13 cleanup issue, not part of the specification, applies to this section:

- REAL-NUMBER-TYPE:X3J13-MAR-89

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