String Character Length: Difference between revisions
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{{Template:split-review}} |
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In this task, the goal is to find the <em>character</em> length of a string. This means encodings like [[UTF-8]] need to be handled properly, as there is not necessarily a one-to-one relationship between bytes and characters. |
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For byte length, see [[String Byte Length]]. |
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==[[ActionScript]]== |
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[[Category:ActionScript]] |
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myStrVar.length() |
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==[[Ada]]== |
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[[Category:Ada]] |
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'''Compiler:''' GCC 4.1.2 |
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Str : String := "Hello World"; |
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Length : constant Natural := Str'Length; |
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==[[AppleScript]]== |
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[[Category:AppleScript]] |
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count of "Hello World" |
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==[[AWK]]== |
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[[Category:AWK]] |
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From within any code block: |
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w=length("Hello, world!") # static string example |
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x=length("Hello," s " world!") # dynamic string example |
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y=length($1) # input field example |
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z=length(s) # variable name example |
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Ad hoc program from command line: |
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echo "Hello, world!" | awk '{print length($0)}' |
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From executable script: (prints for every line arriving on stdin) |
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#!/usr/bin/awk -f |
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{print"The length of this line is "length($0)} |
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==[[C]]== |
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[[Category:C]] |
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'''Standard:''' [[ANSI C]] (AKA [[C89]]): |
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'''Compiler:''' GCC 3.3.3 |
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#include <string.h> |
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int main(void) |
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{ |
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const char *string = "Hello, world!"; |
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size_t length = strlen(string); |
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return 0; |
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} |
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or by hand: |
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int main(void) |
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{ |
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const char *string = "Hello, world!"; |
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size_t length = 0; |
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char *p = (char *) string; |
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while (*p != '\0') length ; |
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return 0; |
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} |
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or (for arrays of char only) |
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#include <stdlib.h> |
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int main(void) |
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{ |
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char const s[] = "Hello, world!"; |
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size_t length = sizeof s - 1; |
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return 0; |
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} |
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For wide character strings (usually Unicode): |
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#include <stdio.h> |
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#include <wchar.h> |
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int main(void) |
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{ |
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wchar_t *s = L"\x304A\x306F\x3088\x3046"; /* Japanese hiragana ohayou */ |
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size_t length; |
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length = wcslen(s); |
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printf("Length in characters = %d\n", length); |
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printf("Length in bytes = %d\n", sizeof(s) * sizeof(wchar_t)); |
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return 0; |
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} |
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==[[C plus plus|C ]]== |
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[[Category:C plus plus|C ]] |
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'''Standard:''' [[ISO C plus plus|ISO C ]] (AKA [[C plus plus 98|C 98]]): |
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'''Compiler:''' g 4.0.2 |
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#include <string> // note: '''not''' <string.h> |
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int main() |
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{ |
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std::string s = "Hello, world!"; |
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// Always in characters == bytes since sizeof(char) == 1 |
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std::string::size_type length = s.length(); // option 1: In Characters/Bytes |
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std::string::size_type size = s.size(); // option 2: In Characters/Bytes |
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} |
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For wide character strings: |
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#include <string> |
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int main() |
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{ |
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std::wstring s = L"\u304A\u306F\u3088\u3046"; |
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std::wstring::size_type length = s.length(); |
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} |
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==[[C sharp|C#]]== |
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[[Category:C sharp|C#]] |
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'''Platform:''' [[.NET]] |
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'''Language Version:''' 1.0 |
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string s = "Hello, world!"; |
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int clength = s.Length; // In characters |
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int blength = System.Text.Encoding.GetBytes(s).length; // In Bytes. |
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==[[Clean]]== |
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[[Category:Clean]] |
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Clean Strings are unboxed arrays of characters. Characters are always a single byte. The function size returns the number of elements in an array. |
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import StdEnv |
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strlen :: String -> Int |
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strlen string = size string |
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Start = strlen "Hello, world!" |
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==[[ColdFusion]]== |
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[[Category:ColdFusion]] |
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#len("Hello World")# |
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==[[Common Lisp]]== |
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[[Category:Common Lisp]] |
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(length "Hello World") |
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==[[Component Pascal]]== |
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[[Category:Component Pascal]] |
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LEN("Hello, World!") |
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==[[E]]== |
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[[Category:E]] |
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"Hello World".size() |
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==[[Forth]]== |
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[[Category:Forth]] |
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The 1994 ANS standard does not have any notion of a particular character encoding, although it distinguishes between character and machine-word addresses. (There is some ongoing work on standardizing an "XCHAR" wordset for dealing with strings in particular encodings such as UTF-8.) |
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'''Interpreter:''' ANS Forth |
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The following code will count the number of UTF-8 characters in a null-terminated string. It relies on the fact that all bytes of a UTF-8 character except the first have the the binary bit pattern "10xxxxxx". |
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binary |
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: utf8 ( str -- str ) |
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begin |
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char |
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dup c@ |
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11000000 and |
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10000000 <> |
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until ; |
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decimal |
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: count-utf8 ( zstr -- n ) |
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0 |
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begin |
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swap dup c@ |
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while |
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utf8 |
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swap 1 |
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repeat drop ; |
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==[[Haskell]]== |
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[[Category:Haskell]] |
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'''Interpreter:''' [[GHC | GHCi]] 6.6, [[Hugs]] |
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'''Compiler:''' [[GHC]] 6.6 |
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strlen = length "Hello, world!" |
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==[[IDL]]== |
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[[Category:IDL]] |
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'''Compiler:''' any IDL compiler should do |
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length = strlen("Hello, world!") |
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==[[Java]]== |
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[[Category:Java]] |
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Java encodes strings in UTF-16, which represents each character with one or two 16-bit values. The most commonly used characters are represented by one 16-bit value, while rarer ones like some mathematical symbols are represented by two. |
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The length method of String objects gives the number of 16-bit values used to encode a string. |
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String s = "Hello, world!"; |
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int length = s.length(); |
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Since Java 1.5, the actual number of characters can be determined by calling the codePointCount method. |
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String str = "\uD834\uDD2A"; //U 1D12A |
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int length1 = str.length(); //2 |
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int length2 = str.codePointCount(0, str.length()); //1 |
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==[[JavaScript]]== |
|||
[[Category:JavaScript]] |
|||
JavaScript encodes strings in UTF-16, which represents each character with one or two 16-bit values. The most commonly used characters are represented by one 16-bit value, while rarer ones like some mathematical symbols are represented by two. |
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JavaScript has no built-in way to determine how many characters are in a string. However, if the string only contains commonly used characters, the number of characters will be equal to the number of 16-bit values used to represent the characters. |
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var str1 = "Hello, world!"; |
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var len1 = str1.length; //13 |
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var str2 = "\uD834\uDD2A"; //U 1D12A represented by a UTF-16 surrogate pair |
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var len2 = str2.length; //2 |
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==[[JudoScript]]== |
|||
[[Category:JudoScript]] |
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//Store length of hello world in length and print it |
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. length = "Hello World".length(); |
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==[[Lua]]== |
|||
[[Category:Lua]] |
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'''Interpreter:''' [[Lua]] 5.0 or later. |
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string="Hello world" |
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length=#string |
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==[[mIRC Scripting Language]]== |
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[[Category:mIRC Scripting Language]] |
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'''Interpreter:''' [[mIRC]] |
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alias stringlength { echo -a Your Name is: $len($$?="Whats your name") letters long! } |
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==[[OCaml]]== |
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[[Category:OCaml]] |
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'''Interpreter'''/'''Compiler:''' [[Ocaml]] 3.09 |
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String.length "Hello world";; |
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==[[Perl]]== |
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[[Category:Perl]] |
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'''Interpreter:''' [[Perl]] any 5.X |
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my $length = length "Hello, world!"; |
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==[[PHP]]== |
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[[Category:PHP]] |
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$length = strlen('Hello, world!'); |
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==[[PL/SQL|PL/SQL]]== |
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[[Category:PL/SQL|PL/SQL]] |
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DECLARE |
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string VARCHAR2( 50 ) := 'Hello, world!'; |
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stringlength NUMBER; |
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BEGIN |
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stringlength := length( string ); |
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END; |
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==[[Python]]== |
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[[Category:Python]] |
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'''Interpreter:''' [[Python]] 2.4 |
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length = len("The length of this string will be determined") |
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==[[Ruby]]== |
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[[Category:Ruby]] |
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'''Library:''' [[active_support]] |
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require 'active_support' |
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puts "Hello World".chars.length |
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==[[Scheme]]== |
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[[Category:Scheme]] |
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(string-length "Hello world") |
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==[[Seed7]]== |
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[[Category:Seed7]] |
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length("Hello, world!") |
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==[[Smalltalk]]== |
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[[Category:Smalltalk]] |
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string := 'Hello, world!". |
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string size. |
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==[[Standard ML]]== |
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[[Category:Standard ML]] |
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'''Interpreter:''' [[Standard ML of New Jersey | SML/NJ]] 110.60, [[Moscow ML]] 2.01 (January 2004) |
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'''Compiler:''' [[MLton]] 20061107 |
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val strlen = size "Hello, world!"; |
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==[[Tcl]]== |
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[[Category:Tcl]] |
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Basic version: |
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string length "Hello, world!" |
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or more elaborately, needs '''Interpreter''' any 8.X. Tested on 8.4.12. |
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fconfigure stdout -encoding utf-8; #So that Unicode string will print correctly |
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set s1 "hello, world" |
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set s2 "\u304A\u306F\u3088\u3046" |
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puts [format "length of \"%s\" in characters is %d" $s1 [string length $s1]] |
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puts [format "length of \"%s\" in characters is %d" $s2 [string length $s2]] |
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==[[UNIX Shell]]== |
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[[Category:UNIX Shell]] |
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With external utilities: |
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'''Interpreter:''' any bourne shell |
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string='Hello, world!' |
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length=`echo -n "$string" | wc -c | tr -dc '0-9'` |
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echo $length # if you want it printed to the terminal |
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With SUSv3 parameter expansion modifier: |
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'''Interpreter:''' [[Almquist SHell]] (NetBSD 3.0), [[Bourne Again SHell]] 3.2, [[Korn SHell]] (5.2.14 99/07/13.2), [[Z SHell]] |
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string='Hello, world!' |
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length="${#string}" |
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echo $length # if you want it printed to the terminal |
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==[[VBScript]]== |
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[[Category:VBScript]] |
|||
Len(string|varname) |
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Returns the length of the string|varname |
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Returns null if string|varname is null |
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==[[xTalk]]== |
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[[Category:xTalk]] |
|||
'''Interpreter:''' HyperCard |
|||
put the length of "Hello World" |
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or |
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put the number of characters in "Hello World" |
Latest revision as of 19:31, 19 January 2008
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