float(n)
is an approximate numerical data type. n
(which must be between 1 and 53) specifies the number of mantissa-bits. If not specified, n
defaults to 53. real
is a synonym for float(24)
. double precision
is a synonym for float(53)
. n
between 1 and 24, float(n)
requires 4 bytes for storage. For n
between 25 and 53, it requires 8 bytes of storage.