Syntax

Double

Description

A data type used to declare variables capable of holding real numbers with 15–16 digits of precision.

Comments

Double variables are used to hold numbers within the following ranges:

Sign

Range

Negative

–1.797693134862315E308 <= double <=

-4.94066E-324

Positive

4.94066E-324 <= double <= 1.797693134862315E308

The type-declaration character for Double is #.

Storage

Internally, doubles are 8-byte (64-bit) IEEE values. Thus, when appearing within a structure, doubles require 8 bytes of storage. When used with binary or random files, 8 bytes of storage are required.

Each Double consists of the following

A 1-bit sign

An 11-bit exponent

A 53-bit significand (mantissa)

See Also

Currency (data type); Date (data type); Integer (data type); Long (data type); Object (data type); Single (data type); String (data type); Variant (data type); Boolean (data type); DefType (statement); CDbl (function).

D