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ICU 77.1: icu::NumberingSystem Class Reference

Defines numbering systems. More...

#include <numsys.h>

Defines numbering systems.

A numbering system describes the scheme by which numbers are to be presented to the end user. In its simplest form, a numbering system describes the set of digit characters that are to be used to display numbers, such as Western digits, Thai digits, Arabic-Indic digits, etc., in a positional numbering system with a specified radix (typically 10). More complicated numbering systems are algorithmic in nature, and require use of an RBNF formatter ( rule based number formatter ), in order to calculate the characters to be displayed for a given number. Examples of algorithmic numbering systems include Roman numerals, Chinese numerals, and Hebrew numerals. Formatting rules for many commonly used numbering systems are included in the ICU package, based on the numbering system rules defined in CLDR. Alternate numbering systems can be specified to a locale by using the numbers locale keyword.

Definition at line 60 of file numsys.h.

Default Constructor.

Stable:

ICU 4.2

Create the default numbering system associated with the specified locale.

Parameters

inLocale The given locale. status ICU status

Stable:

ICU 4.2

Create a numbering system using the specified radix, type, and description.

Parameters

radix The radix (base) for this numbering system. isAlgorithmic true if the numbering system is algorithmic rather than numeric. description The string representing the set of digits used in a numeric system, or the name of the RBNF ruleset to be used in an algorithmic system. status ICU status

Stable:

ICU 4.2

Create the default numbering system associated with the default locale.

Stable:

ICU 4.2

Create a numbering system from one of the predefined numbering systems specified by CLDR and known to ICU, such as "latn", "arabext", or "hanidec"; the full list is returned by unumsys_openAvailableNames.

Note that some of the names listed at http://unicode.org/repos/cldr/tags/latest/common/bcp47/number.xml - e.g. default, native, traditional, finance - do not identify specific numbering systems, but rather key values that may only be used as part of a locale, which in turn defines how they are mapped to a specific numbering system such as "latn" or "hant".

Parameters

name The name of the numbering system. status ICU status; set to U_UNSUPPORTED_ERROR if numbering system not found.

Returns

The NumberingSystem instance, or nullptr if not found.

Stable:

ICU 4.2

Return a StringEnumeration over all the names of numbering systems known to ICU.

The numbering system names will be in alphabetical (invariant) order.

The returned StringEnumeration is owned by the caller, who must delete it when finished with it.

Stable:

ICU 4.2

Returns the description string of this numbering system.

For simple positional systems this is the ordered string of digits (with length matching the radix), e.g. "\u3007\u4E00\u4E8C\u4E09\u56DB\u4E94\u516D\u4E03\u516B\u4E5D" for "hanidec"; it would be "0123456789ABCDEF" for hexadecimal. For algorithmic systems this is the name of the RBNF ruleset used for formatting, e.g. "zh/SpelloutRules/%spellout-cardinal" for "hans" or "%greek-upper" for "grek".

Stable:

ICU 4.2

ICU "poor man's RTTI", returns a UClassID for the actual class.

Stable:

ICU 4.2

Reimplemented from icu::UObject.

Returns the radix of this numbering system.

Simple positional numbering systems typically have radix 10, but might have a radix of e.g. 16 for hexadecimal. The radix is less well-defined for non-positional algorithmic systems.

Stable:

ICU 4.2

ICU "poor man's RTTI", returns a UClassID for this class.

Stable:

ICU 4.2

Returns true if the given numbering system is algorithmic.

Returns

true if the numbering system is algorithmic. Otherwise, return false.

Stable:

ICU 4.2

The documentation for this class was generated from the following file:

• i18n/unicode/numsys.h

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