Quickest Way to Enumerate the Alphabet

Quickest way to enumerate the alphabet

(Assumes ASCII, etc)

for (char c = 'A'; c <= 'Z'; c++)
//do something with letter

Alternatively, you could split it out to a provider and use an iterator (if you're planning on supporting internationalisation):

public class EnglishAlphabetProvider : IAlphabetProvider
public IEnumerable<char> GetAlphabet()
for (char c = 'A'; c <= 'Z'; c++)
yield return c;

IAlphabetProvider provider = new EnglishAlphabetProvider();

foreach (char c in provider.GetAlphabet())
//do something with letter

enumerating over the alphabet from 'a' to 'zzz'

void Main()
foreach (string word in EnumerateCaveNames())

IEnumerable<string> EnumerateCaveNames()
for (int i = 0; i < 26 * 26 * 26; ++i)
yield return BuildCaveName(i);

string BuildCaveName(int caveNum)
string name = (GetLetterFromNumber(caveNum / (26 * 26)) + GetLetterFromNumber((caveNum / 26) % 26) + GetLetterFromNumber(caveNum % 26)).TrimStart('a');
if (name == "")
name = "a";
return name;

string GetLetterFromNumber(int num)
return "" + (char)('a' + num);

How to enumerate the LOCALIZED alphabet in C#?

First off, let me say that I agree with what everyone else is saying. Would you consider the character é to be a valid US English character? It gets used pretty often but its not in the normal "a-z".

That said, here's some code (VB2010). This code calls into the unmanaged function GetLocaleInfoW and asks for a LOCALESIGNATURE structure which contains Unicode code point ranges. This information is used to determine what ranges are needed for a given font.

The Char structure doesn't support all of the Unicode code points so the function returns Strings instead. Look for "Surrogate pair" at the bottom of that link for more info.

This code doesn't do everything that you want, unfortunately. For example, the oft cited Finnish language doesn't have the letter W but in Windows the character exists in the valid code-point range. I don't know a way of getting down to the nitty-gritty on that.

Option Strict On
Option Explicit On

Imports System.Runtime.InteropServices

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
''//Create our helper function
Dim UCR As New UnicodeCharRanges()

''//Get our ranges for ja-JP
Dim Ranges = UCR.GetUnicodeRanges("ja-JP")
If Ranges IsNot Nothing Then
''//Get our characters (strings actually)
Dim Chars = UCR.GetCharactersForUnicodeRanges(Ranges)
Trace.WriteLine(Chars.Count) ''//28351

''//Include surrogate pairs as letters. .Net does not have a way to determine if these should be considered letters
Chars = UCR.GetCharactersForUnicodeRanges(Ranges, True)
Trace.WriteLine(Chars.Count) ''//71615
End If

''//Get our ranges for en-US
Ranges = UCR.GetUnicodeRanges("en-US")
If Ranges IsNot Nothing Then
''//Get our characters (strings actually)
Dim Chars = UCR.GetCharactersForUnicodeRanges(Ranges)
Trace.WriteLine(Chars.Count) ''//117
End If

End Sub
End Class
Public Class UnicodeCharRanges
#Region " Unmanaged "
<DllImport("kernel32.dll", SetLastError:=True, CharSet:=CharSet.Unicode)> _
Private Shared Function GetLocaleInfoW(ByVal locale As Integer, ByVal LCType As Integer, ByRef lpLCData As LOCALESIGNATURE, ByVal cchData As Integer) As Integer
End Function
Private LOCALE_FONTSIGNATURE As Integer = &H58
<MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=4)> Dim lsUsb() As Integer
<MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=2)> Dim lsCsbDefault() As Integer
<MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=2)> Dim lsCsbSupported() As Integer
Public Sub Initialize()
ReDim lsUsb(3)
ReDim lsCsbDefault(1)
ReDim lsCsbSupported(1)
End Sub
End Structure
#End Region
#Region " Locals "
Private AllRanges As List(Of UnicodeRangeInfo)
#End Region
Private Sub LoadRanges()
''//Ranges from http://msdn.microsoft.com/en-us/library/dd374090%28VS.85%29.aspx
AllRanges = New List(Of UnicodeRangeInfo)
AllRanges.Add(New UnicodeRangeInfo(0, &H0, &H7F, "Basic Latin"))
AllRanges.Add(New UnicodeRangeInfo(1, &H80, &HFF, "Latin-1 Supplement"))
AllRanges.Add(New UnicodeRangeInfo(2, &H100, &H17F, "Latin Extended-A"))
AllRanges.Add(New UnicodeRangeInfo(3, &H180, &H24F, "Latin Extended-B"))
AllRanges.Add(New UnicodeRangeInfo(4, &H250, &H2AF, "IPA Extensions"))
AllRanges.Add(New UnicodeRangeInfo(4, &H1D00, &H1D7F, "Phonetic Extensions"))
AllRanges.Add(New UnicodeRangeInfo(4, &H1D80, &H1DBF, "Phonetic Extensions Supplement"))
AllRanges.Add(New UnicodeRangeInfo(5, &H2B0, &H2FF, "Spacing Modifier Letters"))
AllRanges.Add(New UnicodeRangeInfo(5, &HA700, &HA71F, "Modifier Tone Letters"))
AllRanges.Add(New UnicodeRangeInfo(6, &H300, &H36F, "Combining Diacritical Marks"))
AllRanges.Add(New UnicodeRangeInfo(6, &H1DC0, &H1DFF, "Combining Diacritical Marks Supplement"))
AllRanges.Add(New UnicodeRangeInfo(7, &H370, &H3FF, "Greek and Coptic"))
AllRanges.Add(New UnicodeRangeInfo(8, &H2C80, &H2CFF, "Coptic"))
AllRanges.Add(New UnicodeRangeInfo(9, &H400, &H4FF, "Cyrillic"))
AllRanges.Add(New UnicodeRangeInfo(9, &H500, &H52F, "Cyrillic Supplement"))
AllRanges.Add(New UnicodeRangeInfo(9, &H2DE0, &H2DFF, "Cyrillic Extended-A"))
AllRanges.Add(New UnicodeRangeInfo(9, &HA640, &HA69F, "Cyrillic Extended-B"))
AllRanges.Add(New UnicodeRangeInfo(10, &H530, &H58F, "Armenian"))
AllRanges.Add(New UnicodeRangeInfo(11, &H590, &H5FF, "Hebrew"))
AllRanges.Add(New UnicodeRangeInfo(12, &HA500, &HA63F, "&hVai"))
AllRanges.Add(New UnicodeRangeInfo(13, &H600, &H6FF, "Arabic"))
AllRanges.Add(New UnicodeRangeInfo(13, &H750, &H77F, "Arabic Supplement"))
AllRanges.Add(New UnicodeRangeInfo(14, &H7C0, &H7FF, "NKo"))
AllRanges.Add(New UnicodeRangeInfo(15, &H900, &H97F, "Devanagari"))
AllRanges.Add(New UnicodeRangeInfo(16, &H980, &H9FF, "Bengali"))
AllRanges.Add(New UnicodeRangeInfo(17, &HA00, &HA7F, "Gurmukhi"))
AllRanges.Add(New UnicodeRangeInfo(18, &HA80, &HAFF, "Gujarati"))
AllRanges.Add(New UnicodeRangeInfo(19, &HB00, &HB7F, "Oriya"))
AllRanges.Add(New UnicodeRangeInfo(20, &HB80, &HBFF, "Tamil"))
AllRanges.Add(New UnicodeRangeInfo(21, &HC00, &HC7F, "Telugu"))
AllRanges.Add(New UnicodeRangeInfo(22, &HC80, &HCFF, "Kannada"))
AllRanges.Add(New UnicodeRangeInfo(23, &HD00, &HD7F, "Malayalam"))
AllRanges.Add(New UnicodeRangeInfo(24, &HE00, &HE7F, "Thai"))
AllRanges.Add(New UnicodeRangeInfo(25, &HE80, &HEFF, "Lao"))
AllRanges.Add(New UnicodeRangeInfo(26, &H10A0, &H10FF, "Georgian"))
AllRanges.Add(New UnicodeRangeInfo(26, &H2D00, &H2D2F, "Georgian Supplement"))
AllRanges.Add(New UnicodeRangeInfo(27, &H1B00, &H1B7F, "Balinese"))
AllRanges.Add(New UnicodeRangeInfo(28, &H1100, &H11FF, "Hangul Jamo"))
AllRanges.Add(New UnicodeRangeInfo(29, &H1E00, &H1EFF, "Latin Extended Additional"))
AllRanges.Add(New UnicodeRangeInfo(29, &H2C60, &H2C7F, "Latin Extended-C"))
AllRanges.Add(New UnicodeRangeInfo(29, &HA720, &HA7FF, "Latin Extended-D"))
AllRanges.Add(New UnicodeRangeInfo(30, &H1F00, &H1FFF, "Greek Extended"))
AllRanges.Add(New UnicodeRangeInfo(31, &H2000, &H206F, "General Punctuation"))
AllRanges.Add(New UnicodeRangeInfo(31, &H2E00, &H2E7F, "Supplemental Punctuation"))
AllRanges.Add(New UnicodeRangeInfo(32, &H2070, &H209F, "Superscripts And Subscripts"))
AllRanges.Add(New UnicodeRangeInfo(33, &H20A0, &H20CF, "Currency Symbols"))
AllRanges.Add(New UnicodeRangeInfo(34, &H20D0, &H20FF, "Combining Diacritical Marks For Symbols"))
AllRanges.Add(New UnicodeRangeInfo(35, &H2100, &H214F, "Letterlike Symbols"))
AllRanges.Add(New UnicodeRangeInfo(36, &H2150, &H218F, "Number Forms"))
AllRanges.Add(New UnicodeRangeInfo(37, &H2190, &H21FF, "Arrows"))
AllRanges.Add(New UnicodeRangeInfo(37, &H27F0, &H27FF, "Supplemental Arrows-A"))
AllRanges.Add(New UnicodeRangeInfo(37, &H2900, &H297F, "Supplemental Arrows-B"))
AllRanges.Add(New UnicodeRangeInfo(37, &H2B00, &H2BFF, "Miscellaneous Symbols and Arrows"))
AllRanges.Add(New UnicodeRangeInfo(38, &H2200, &H22FF, "Mathematical Operators"))
AllRanges.Add(New UnicodeRangeInfo(38, &H27C0, &H27EF, "Miscellaneous Mathematical Symbols-A"))
AllRanges.Add(New UnicodeRangeInfo(38, &H2980, &H29FF, "Miscellaneous Mathematical Symbols-B"))
AllRanges.Add(New UnicodeRangeInfo(38, &H2A00, &H2AFF, "Supplemental Mathematical Operators"))
AllRanges.Add(New UnicodeRangeInfo(39, &H2300, &H23FF, "Miscellaneous Technical"))
AllRanges.Add(New UnicodeRangeInfo(40, &H2400, &H243F, "Control Pictures"))
AllRanges.Add(New UnicodeRangeInfo(41, &H2440, &H245F, "Optical Character Recognition"))
AllRanges.Add(New UnicodeRangeInfo(42, &H2460, &H24FF, "Enclosed Alphanumerics"))
AllRanges.Add(New UnicodeRangeInfo(43, &H2500, &H257F, "Box Drawing"))
AllRanges.Add(New UnicodeRangeInfo(44, &H2580, &H259F, "Block Elements"))
AllRanges.Add(New UnicodeRangeInfo(45, &H25A0, &H25FF, "Geometric Shapes"))
AllRanges.Add(New UnicodeRangeInfo(46, &H2600, &H26FF, "Miscellaneous Symbols"))
AllRanges.Add(New UnicodeRangeInfo(47, &H2700, &H27BF, "Dingbats"))
AllRanges.Add(New UnicodeRangeInfo(48, &H3000, &H303F, "CJK Symbols And Punctuation"))
AllRanges.Add(New UnicodeRangeInfo(49, &H3040, &H309F, "Hiragana"))
AllRanges.Add(New UnicodeRangeInfo(50, &H30A0, &H30FF, "Katakana"))
AllRanges.Add(New UnicodeRangeInfo(50, &H31F0, &H31FF, "Katakana Phonetic Extensions"))
AllRanges.Add(New UnicodeRangeInfo(51, &H3100, &H312F, "Bopomofo"))
AllRanges.Add(New UnicodeRangeInfo(51, &H31A0, &H31BF, "Bopomofo Extended"))
AllRanges.Add(New UnicodeRangeInfo(52, &H3130, &H318F, "Hangul Compatibility Jamo"))
AllRanges.Add(New UnicodeRangeInfo(53, &HA840, &HA87F, "Phags-pa"))
AllRanges.Add(New UnicodeRangeInfo(54, &H3200, &H32FF, "Enclosed CJK Letters And Months"))
AllRanges.Add(New UnicodeRangeInfo(55, &H3300, &H33FF, "CJK Compatibility"))
AllRanges.Add(New UnicodeRangeInfo(56, &HAC00, &HD7AF, "Hangul Syllables"))
AllRanges.Add(New UnicodeRangeInfo(57, &HD800, &HDFFF, "Non-Plane 0. Note that setting this bit implies that there is at least one supplementary code point beyond the Basic Multilingual Plane (BMP) that is supported by this font. See Surrogates and Supplementary Characters."))
AllRanges.Add(New UnicodeRangeInfo(58, &H10900, &H1091F, "Phoenician"))
AllRanges.Add(New UnicodeRangeInfo(59, &H2E80, &H2EFF, "CJK Radicals Supplement"))
AllRanges.Add(New UnicodeRangeInfo(59, &H2F00, &H2FDF, "Kangxi Radicals"))
AllRanges.Add(New UnicodeRangeInfo(59, &H2FF0, &H2FFF, "Ideographic Description Characters"))
AllRanges.Add(New UnicodeRangeInfo(59, &H3190, &H319F, "Kanbun"))
AllRanges.Add(New UnicodeRangeInfo(59, &H3400, &H4DBF, "CJK Unified Ideographs Extension A"))
AllRanges.Add(New UnicodeRangeInfo(59, &H4E00, &H9FFF, "CJK Unified Ideographs"))
AllRanges.Add(New UnicodeRangeInfo(59, &H20000, &H2A6DF, "CJK Unified Ideographs Extension B"))
AllRanges.Add(New UnicodeRangeInfo(60, &HE000, &HF8FF, "Private Use Area"))
AllRanges.Add(New UnicodeRangeInfo(61, &H31C0, &H31EF, "CJK Strokes"))
AllRanges.Add(New UnicodeRangeInfo(61, &HF900, &HFAFF, "CJK Compatibility Ideographs"))
AllRanges.Add(New UnicodeRangeInfo(61, &H2F800, &H2FA1F, "CJK Compatibility Ideographs Supplement"))
AllRanges.Add(New UnicodeRangeInfo(62, &HFB00, &HFB4F, "Alphabetic Presentation Forms"))
AllRanges.Add(New UnicodeRangeInfo(63, &HFB50, &HFDFF, "Arabic Presentation Forms-A"))
AllRanges.Add(New UnicodeRangeInfo(64, &HFE20, &HFE2F, "Combining Half Marks"))
AllRanges.Add(New UnicodeRangeInfo(65, &HFE10, &HFE1F, "Vertical Forms"))
AllRanges.Add(New UnicodeRangeInfo(65, &HFE30, &HFE4F, "CJK Compatibility Forms"))
AllRanges.Add(New UnicodeRangeInfo(66, &HFE50, &HFE6F, "Small Form Variants"))
AllRanges.Add(New UnicodeRangeInfo(67, &HFE70, &HFEFF, "Arabic Presentation Forms-B"))
AllRanges.Add(New UnicodeRangeInfo(68, &HFF00, &HFFEF, "Halfwidth And Fullwidth Forms"))
AllRanges.Add(New UnicodeRangeInfo(69, &HFFF0, &HFFFF, "Specials"))
AllRanges.Add(New UnicodeRangeInfo(70, &HF00, &HFFF, "Tibetan"))
AllRanges.Add(New UnicodeRangeInfo(71, &H700, &H74F, "Syriac"))
AllRanges.Add(New UnicodeRangeInfo(72, &H780, &H7BF, "Thaana"))
AllRanges.Add(New UnicodeRangeInfo(73, &HD80, &HDFF, "Sinhala"))
AllRanges.Add(New UnicodeRangeInfo(74, &H1000, &H109F, "Myanmar"))
AllRanges.Add(New UnicodeRangeInfo(75, &H1200, &H137F, "Ethiopic"))
AllRanges.Add(New UnicodeRangeInfo(75, &H1380, &H139F, "Ethiopic Supplement"))
AllRanges.Add(New UnicodeRangeInfo(75, &H2D80, &H2DDF, "Ethiopic Extended"))
AllRanges.Add(New UnicodeRangeInfo(76, &H13A0, &H13FF, "Cherokee"))
AllRanges.Add(New UnicodeRangeInfo(77, &H1400, &H167F, "Unified Canadian Aboriginal Syllabics"))
AllRanges.Add(New UnicodeRangeInfo(78, &H1680, &H169F, "Ogham"))
AllRanges.Add(New UnicodeRangeInfo(79, &H16A0, &H16FF, "Runic"))
AllRanges.Add(New UnicodeRangeInfo(80, &H1780, &H17FF, "Khmer"))
AllRanges.Add(New UnicodeRangeInfo(80, &H19E0, &H19FF, "Khmer Symbols"))
AllRanges.Add(New UnicodeRangeInfo(81, &H1800, &H18AF, "Mongolian"))
AllRanges.Add(New UnicodeRangeInfo(82, &H2800, &H28FF, "Braille Patterns"))
AllRanges.Add(New UnicodeRangeInfo(83, &HA000, &HA48F, "Yi Syllables"))
AllRanges.Add(New UnicodeRangeInfo(83, &HA490, &HA4CF, "Yi Radicals"))
AllRanges.Add(New UnicodeRangeInfo(84, &H1700, &H171F, "Tagalog"))
AllRanges.Add(New UnicodeRangeInfo(84, &H1720, &H173F, "Hanunoo"))
AllRanges.Add(New UnicodeRangeInfo(84, &H1740, &H175F, "Buhid"))
AllRanges.Add(New UnicodeRangeInfo(84, &H1760, &H177F, "Tagbanwa"))
AllRanges.Add(New UnicodeRangeInfo(85, &H10300, &H1032F, "Old Italic"))
AllRanges.Add(New UnicodeRangeInfo(86, &H10330, &H1034F, "Gothic"))
AllRanges.Add(New UnicodeRangeInfo(87, &H10400, &H1044F, "Deseret"))
AllRanges.Add(New UnicodeRangeInfo(88, &H1D000, &H1D0FF, "Byzantine Musical Symbols"))
AllRanges.Add(New UnicodeRangeInfo(88, &H1D100, &H1D1FF, "Musical Symbols"))
AllRanges.Add(New UnicodeRangeInfo(88, &H1D200, &H1D24F, "Ancient Greek Musical Notation"))
AllRanges.Add(New UnicodeRangeInfo(89, &H1D400, &H1D7FF, "Mathematical Alphanumeric Symbols"))
AllRanges.Add(New UnicodeRangeInfo(90, &HFF000, &HFFFFD, "Private Use (plane 15)"))
AllRanges.Add(New UnicodeRangeInfo(90, &H100000, &H10FFFD, "Private Use (plane 16)"))
AllRanges.Add(New UnicodeRangeInfo(91, &HFE00, &HFE0F, "Variation Selectors"))
AllRanges.Add(New UnicodeRangeInfo(91, &HE0100, &HE01EF, "Variation Selectors Supplement"))
AllRanges.Add(New UnicodeRangeInfo(92, &HE0000, &HE007F, "Tags"))
AllRanges.Add(New UnicodeRangeInfo(93, &H1900, &H194F, "Limbu"))
AllRanges.Add(New UnicodeRangeInfo(94, &H1950, &H197F, "Tai Le"))
AllRanges.Add(New UnicodeRangeInfo(95, &H1980, &H19DF, "New Tai Lue"))
AllRanges.Add(New UnicodeRangeInfo(96, &H1A00, &H1A1F, "Buginese"))
AllRanges.Add(New UnicodeRangeInfo(97, &H2C00, &H2C5F, "Glagolitic"))
AllRanges.Add(New UnicodeRangeInfo(98, &H2D30, &H2D7F, "Tifinagh"))
AllRanges.Add(New UnicodeRangeInfo(99, &H4DC0, &H4DFF, "Yijing Hexagram Symbols"))
AllRanges.Add(New UnicodeRangeInfo(100, &HA800, &HA82F, "Syloti Nagri"))
AllRanges.Add(New UnicodeRangeInfo(101, &H10000, &H1007F, "Linear B Syllabary"))
AllRanges.Add(New UnicodeRangeInfo(101, &H10080, &H100FF, "Linear B Ideograms"))
AllRanges.Add(New UnicodeRangeInfo(101, &H10100, &H1013F, "Aegean Numbers"))
AllRanges.Add(New UnicodeRangeInfo(102, &H10140, &H1018F, "Ancient Greek Numbers"))
AllRanges.Add(New UnicodeRangeInfo(103, &H10380, &H1039F, "Ugaritic"))
AllRanges.Add(New UnicodeRangeInfo(104, &H103A0, &H103DF, "Old Persian"))
AllRanges.Add(New UnicodeRangeInfo(105, &H10450, &H1047F, "Shavian"))
AllRanges.Add(New UnicodeRangeInfo(106, &H10480, &H104AF, "Osmanya"))
AllRanges.Add(New UnicodeRangeInfo(107, &H10800, &H1083F, "Cypriot Syllabary"))
AllRanges.Add(New UnicodeRangeInfo(108, &H10A00, &H10A5F, "Kharoshthi"))
AllRanges.Add(New UnicodeRangeInfo(109, &H1D300, &H1D35F, "Tai Xuan Jing Symbols"))
AllRanges.Add(New UnicodeRangeInfo(110, &H12000, &H123FF, "Cuneiform"))
AllRanges.Add(New UnicodeRangeInfo(110, &H12400, &H1247F, "Cuneiform Numbers and Punctuation"))
AllRanges.Add(New UnicodeRangeInfo(111, &H1D360, &H1D37F, "Counting Rod Numerals"))
AllRanges.Add(New UnicodeRangeInfo(112, &H1B80, &H1BBF, "Sundanese"))
AllRanges.Add(New UnicodeRangeInfo(113, &H1C00, &H1C4F, "Lepcha"))
AllRanges.Add(New UnicodeRangeInfo(114, &H1C50, &H1C7F, "Ol Chiki"))
AllRanges.Add(New UnicodeRangeInfo(115, &HA880, &HA8DF, "Saurashtra"))
AllRanges.Add(New UnicodeRangeInfo(116, &HA900, &HA92F, "Kayah Li"))
AllRanges.Add(New UnicodeRangeInfo(117, &HA930, &HA95F, "Rejang"))
AllRanges.Add(New UnicodeRangeInfo(118, &HAA00, &HAA5F, "Cham"))
AllRanges.Add(New UnicodeRangeInfo(119, &H10190, &H101CF, "hAncient Symbols"))
AllRanges.Add(New UnicodeRangeInfo(120, &H101D0, &H101FF, "Phaistos Disc"))
AllRanges.Add(New UnicodeRangeInfo(121, &H10280, &H1029F, "Lycian"))
AllRanges.Add(New UnicodeRangeInfo(121, &H102A0, &H102DF, "Carian"))
AllRanges.Add(New UnicodeRangeInfo(121, &H10920, &H1093F, "Lydian"))
AllRanges.Add(New UnicodeRangeInfo(122, &H1F000, &H1F02F, "Mahjong Tiles"))
AllRanges.Add(New UnicodeRangeInfo(122, &H1F030, &H1F09F, "Domino Tiles"))
End Sub
Sub New()
End Sub
Public Function GetCharactersForUnicodeRanges(ByVal ranges As List(Of UnicodeRangeInfo), Optional ByVal returnSurrogatePairs As Boolean = False) As List(Of String)
''//The Char structure cannot represent all Unicode characters so we need to return strings. See "Surrogate pairs" at the bottom of http://www.yoda.arachsys.com/csharp/unicode.html
Dim Ret As New List(Of String)
Dim S As String
Dim C As Char
''//Loop through all of the ranges
For Each R In ranges
''//Loop from start to end
For I = R.StartRange To R.EndRange
''//Convert the integer to either a char or a surrogate pair string
S = Char.ConvertFromUtf32(I)
''//See if the character is a valid Char
If Char.TryParse(S, C) Then
''//See if the Char is a letter
If Char.IsLetter(C) Then Ret.Add(C)
ElseIf returnSurrogatePairs Then
''//If asked to also return surrogate pairs then do so
End If

Return Ret
End Function
Public Function GetUnicodeRanges(ByVal cultureName As String) As List(Of UnicodeRangeInfo)
''//Get the culture info for the given locale
Dim CI As New System.Globalization.CultureInfo(cultureName)

''//Create and init our structure that will get passed

''//Determine the size of our structure
Dim SI = Marshal.SizeOf(FI)

''//Call the unmanaged function
Dim Result As Integer = GetLocaleInfoW(CI.LCID, LOCALE_FONTSIGNATURE, FI, SI)
If Result = 0 Then
''//If we get a zero then there's an error. This should call GetLastError ideally
Return Nothing
''//The lsUsb field represents a 128 bit value but we pass it into the unmanaged function as an array of 4 integers.
''//The code below converts the array of integers to a giant binary string.
''//There are of course better ways to do this that will save 5ms but I will leave that to you
Dim Usb = StrReverse(String.Format("{0}{1}{2}{3}",
Convert.ToString(FI.lsUsb(3), 2).PadLeft(32, "0"c),
Convert.ToString(FI.lsUsb(2), 2).PadLeft(32, "0"c),
Convert.ToString(FI.lsUsb(1), 2).PadLeft(32, "0"c),
Convert.ToString(FI.lsUsb(0), 2).PadLeft(32, "0"c)))

''//This will be our return ranges
Dim LocaleRanges As New List(Of UnicodeRangeInfo)

Dim loopI As Integer

''//Loop through the bits
''//Technically the last couple of bits aren't supposed to be used but there is no value in UnicodeRangeInfo for them anyway so it does not matter
For I = 0 To (Usb.Length - 1)
''//This is to stop the compiler complaining about lambda expressions
loopI = I

''//If the bit is set
If Usb(I) = "1"c Then
''//Find all ranges in the master range list with that bit set
LocaleRanges.AddRange(AllRanges.FindAll(Function(n) n.Bit = loopI))
End If
Return LocaleRanges
End If
End Function

Public Structure UnicodeRangeInfo
Public Property Name As String
Public Property StartRange As Integer
Public Property EndRange As Integer
Public Property Bit As Integer
Public Sub New(ByVal bit As Integer, ByVal startRange As Integer, ByVal endRange As Integer, ByVal name As String)
Me.Bit = bit
Me.StartRange = startRange
Me.EndRange = endRange
Me.Name = name
End Sub
Public Overrides Function ToString() As String
Return String.Format("{0}-{1} : {2}", Convert.ToString(Me.StartRange, 16).PadLeft(8, "0"c), Convert.ToString(Me.EndRange, 16).PadLeft(8, "0"c), Me.Name)
End Function
End Structure
End Class

What is an idiomatic way to enumerate the alphabet in go?

for _, c := range "abcdefghijklmnopqrstuvwxyz" {

How to make a continuous alphabetic list python (from a-z then from aa, ab, ac etc)

Use itertools.product.

from string import ascii_lowercase
import itertools

def iter_all_strings():
for size in itertools.count(1):
for s in itertools.product(ascii_lowercase, repeat=size):
yield "".join(s)

for s in iter_all_strings():
if s == 'bb':



This has the added benefit of going well beyond two-letter combinations. If you need a million strings, it will happily give you three and four and five letter strings.

Bonus style tip: if you don't like having an explicit break inside the bottom loop, you can use islice to make the loop terminate on its own:

for s in itertools.islice(iter_all_strings(), 54):
print s

Iterating through the Alphabet - C# a-caz

Edit: Made it do exactly as the OP's latest edit wants

This is the simplest solution, and tested:

static void Main(string[] args)

private static string GetNextBase26(string a)
return Base26Sequence().SkipWhile(x => x != a).Skip(1).First();

private static IEnumerable<string> Base26Sequence()
long i = 0L;
while (true)
yield return Base26Encode(i++);

private static char[] base26Chars = "abcdefghijklmnopqrstuvwxyz".ToCharArray();
private static string Base26Encode(Int64 value)
string returnValue = null;
returnValue = base26Chars[value % 26] + returnValue;
value /= 26;
} while (value-- != 0);
return returnValue;

How to get an easier way of generating the alphabet in C++?

Because all characters can be represented in ASCII codes ('a' starts at 97, all ASCII codes are int), you can simply make a loop to do that. For example:

char albet[26];

for (int ch = 'a'; ch <= 'z'; ch++) {
//do ch-'a' because we start at index 0
albet[ch-'a'] = ch;

and you are done!

Generating an array of letters in the alphabet

I don't think there is a built in way, but I think the easiest would be

  char[] alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();

Related Topics

Leave a reply