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# ICU 3.8 Documentation

## API Reference Usage

### C++ Programmers:

Use Class Hierarchy or Alphabetical List or Compound List to find the class you are interested in. For example, to find BreakIterator, you can go to the Alphabetical List, then click on "BreakIterator". Once you are at the class, you will find an inheritance chart, a list of the public members, a detailed description of the class, then detailed member descriptions.

### C Programmers:

Use Module List or File Members to find a list of all the functions and constants. For example, to find BreakIterator functions you would click on File List, then find "ubrk.h" and click on it. You will find descriptions of Defines, Typedefs, Enumerations, and Functions, with detailed descriptions below. If you want to find a specific function, such as ubrk_next(), then click first on File Members, then use your browser Find dialog to search for "ubrk_next()".

### API References for Previous Releases

The API References for each release of ICU are also available as a zip file from the ICU download page.

## Architecture (User's Guide)

- Introduction
- Internationalization
- Locale Model
- Multithreading
- Conversion
- Error Handling

## Module List

Module Name | C | C++
Basic Types and Constants | utypes.h | utypes.h
Strings and Character Iteration | ustring.h, utf.h | UnicodeString, CharacterIterator
Unicode Character Properties and Names | uchar.h | uchar.h C API
Codepage Conversion | ucnv.h | ucnv.h C API
Unicode Text Compression | ucnv.h (encoding name "SCSU" or "BOCU-1") | ucnv.h C API
Locales | uloc.h | Locale
Resource Bundles | ures.h | ResourceBundle
Normalization | unorm.h | Normalizer
Calendars | ucal.h | Calendar
Date and Time Formatting | udat.h | DateFormat
Message Formatting | umsg.h | MessageFormat
Number Formatting | unum.h | NumberFormat
Number Spellout (Rule Based Number Formatting) | unum.h (use UNUM_SPELLOUT) | RuleBasedNumberFormat
Text Transformation (Transliteration) | utrans.h | Transliterator
Bidirectional Algorithm | ubidi.h | ubidi.h C API
Arabic Shaping | ushape.h | ushape.h C API
Collation | ucol.h | Collator
String Searching | usearch.h | StringSearch
Text Boundary Analysis (Break Iteration) | ubrk.h | BreakIterator
Unicode Set | uset.h | UnicodeSet
Regular Expressions | uregex.h | RegexPattern, RegexMatcher
StringPrep | usprep.h | usprep.h C API
International Domain Names in Applications | uidna.h | uidna.h C API
Universal Time Scale | utmscale.h | utmscale.h C API
Basic Layout Engine Types and Constants | (no C API) | LETypes.h
Complex Text Layout | (no C API) | LayoutEngine, ParagraphLayout
ICU I/O | ustdio.h | ustream.h