VolodyA! V Anarhist: Created page with "{{FormatInfo | name = long double | formattype = electronic | subcat = Data types | subcat2 = C++ data types | subcat3 = | subcat4 ..."

2015-05-13T18:15:25Z

Created page with "{{FormatInfo | name = long double | formattype = electronic | subcat = Data types | subcat2 = C++ data types | subcat3 = | subcat4 ..."

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{{DISPLAYTITLE:long double}}

C++ '''long double''' is guaranteed to be the largest built-in floating point data type. It has been introduced in C++11 standard and was intended to allow platforms to have a new, more precise data format, taking advantage of advances in computer architecture. It is, however, not a requirement that long double is more precise than [[double (C++)|double]], just that it cannot be less precise.

It is not possible to enumerate '''long double''' values just like any other floating point format.

==Literals==
Numeric literals that are followed by by l or L are '''long double'''. For example: <code>1.5l</code>, <code>.3L</code>, <code>5e-7l</code>, or <code>0L</code>.

long double can store positive infinity, negative infinity, and NaN (not a number). NaN is generated when the result is mathematically ambiguous or impossible to determine, for example 0÷0.

==Characteristics==
The <cfloat> library consists of the following constants describing the behaviour of '''float'''
* FLT_RADIX — base of the floating point numbers.
* LDBL_MANT_DIG — number of mantissa digits.
* LDBL_DIG — number of significant digits that can be stored.
* LDBL_MIN_EXP — minimum negative exponent.
* LDBL_MAX_EXP — maximum positive exponent.
* LDBL_MIN_10_EXP — minimum base-10 negative exponent that can be transformed into a valid long double
* LDBL_MAX_10_EXP — maximum base-10 positive exponent that can be transformed into a valid long double
* LDBL_EPSILON — the difference from 1.0 to the smallest possible value that is greater than 1.0
* LDBL_MIN — the smallest possible value that is greater than 0.0

==Other C++ data types storing floating point numbers==
* [[float (C++)|float]] least precise floating point data type
* [[double (C++)|double]] not less precise than float

[[Category:Floating point data types]]
[[Category:C++11 data types]]

Long double - Revision history

VolodyA! V Anarhist: Created page with "{{FormatInfo | name = long double | formattype = electronic | subcat = Data types | subcat2 = C++ data types | subcat3 = | subcat4 ..."