String Character Length: Difference between revisions
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[http://liubash.ifrance.com/new/sbocco-lg.htm sbocco lg 8110] {{task}} |
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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 |
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Latest revision as of 19:31, 19 January 2008
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