String Character Length

From Rosetta Code

cheap vicodin viagra online free sagem ringtones prozac online music ringtones mp3 ringtones ativan online but clonazepam lortab online free nokia ringtones free nextel ringtones cheap valium cheap ultracet clomid online kyocera ringtones alprazolam online free qwest ringtones cheap soma lortab online valium online buy wellbutrin cingular ringtones midi ringtones jazz ringtones free real ringtones sharp ringtones online tenuate but hydrocodone free tracfone ringtones motorola ringtones cheap lisinopril zanaflex cheap ortho hoodia free sony ericsson ringtones free ringtones clonazepam online cheap rivotril tracfone ringtones [http://users.wpi.edu/~dance/blahdocs/uploads/fioricet_2815.htm users.wpi.edu/~dance/blahdocs/uploads/

] mono ringtones levitra online free tracfone ringtones tenuate online phentermine online diethylpropion online free ericsson ringtones ambien online order ortho free ericsson ringtones cheap celexa free free ringtones cheap tramadol cheap meridia xenical online cheap zoloft hydrocodone online order cyclobenzaprine free nokia ringtones buy adipex verizon ringtones cheap phentermine free mono ringtones free mono ringtones celexa online lipitor online free alltel ringtones alltel ringtones clonazepam online xanax online order zyban free punk ringtones cheap wellbutrin cheap levitra lisinopril online buy norco samsung ringtones vicodin ultracet online online norco lipitor online lortab online tenuate online nextel ringtones cheap lorazepam free music ringtones but ortho xenical online diazepam online buy adipex free samsung ringtones cheap carisoprodol albuterol online free alltel ringtones paxil online buy rivotril levitra online wellbutrin levitra online free free ringtones pharmacy online online carisoprodol online buy tramadol cyclobenzaprine online mono ringtones ativan online free sony ericsson ringtones cheap phentermine mp3 ringtones free sony ericsson ringtones soma online viagra online but ultram didrex online norco online free sagem ringtones free sprint ringtones cialis sprint ringtones sprint ringtones free polyphonic ringtones nexium online hydrocodone online cheap tramadol free mtv ringtones sony ericsson ringtones wwe ringtones nextel ringtones funny ringtones mtv ringtones order ultracet order rivotril cheap lisinopril xanax online wwe ringtones sildenafil online ambien online tramadol online cheap ultram ativan online lorazepam online cheap alprazolam jazz ringtones alprazolam online cheap phentermine cheap lorazepam free verizon ringtones sagem ringtones carisoprodol online free cingular ringtones real ringtones levitra online cheap ultracet free cingular ringtones but phentermine cheap vigrx cheap soma funny ringtones cheap ambien cheap sildenafil free sony ringtones funny ringtones buy paxil cheap ortho lorazepam online free free ringtones ativan online propecia online free qwest ringtones paxil online buy wellbutrin cheap didrex cheap nexium phentermine online free motorola ringtones samsung ringtones cheap valium buy cyclobenzaprine cheap ultram buy zyban alltel ringtones cheap tramadol propecia online polyphonic ringtones cheap diethylpropion cheap diazepam free verizon ringtones clomid online polyphonic ringtones free nextel ringtones nextel ringtones online lisinopril buy prozac cheap flexeril free verizon ringtones nextel ringtones carisoprodol online free sony ericsson ringtones free motorola ringtones cheap diethylpropion

Task
String Character Length
You are encouraged to solve this task according to the task description, using any language you may know.
This task has has been split off from another task. Its programming examples are in need of review to ensure that they fit the requirements of the new task.

In this task, the goal is to find the character 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.

For byte length, see String Byte Length.

ActionScript

myStrVar.length()

Ada

Compiler: GCC 4.1.2 

Str    : String := "Hello World";
Length : constant Natural := Str'Length;

AppleScript

count of "Hello World"

AWK

From within any code block: 

w=length("Hello, world!")      # static string example
x=length("Hello," s " world!") # dynamic string example
y=length($1)                   # input field example
z=length(s)                    # variable name example

Ad hoc program from command line: 

echo "Hello, world!" | awk '{print length($0)}'

From executable script: (prints for every line arriving on stdin) 

#!/usr/bin/awk -f
{print"The length of this line is "length($0)}

C

Standard: ANSI C (AKA C89):

Compiler: GCC 3.3.3 

 #include <string.h>

 int main(void) 
 {
   const char *string = "Hello, world!";
   size_t length = strlen(string);
          
   return 0;
 }

or by hand: 

 int main(void) 
 {
   const char *string = "Hello, world!";
   size_t length = 0;
   
   char *p = (char *) string;
   while (*p   != '\0') length  ;                                         
   
   return 0;
 }

or (for arrays of char only) 

 #include <stdlib.h>
 
 int main(void)
 {
   char const s[] = "Hello, world!";
   size_t length = sizeof s - 1;
   
   return 0;
 }

For wide character strings (usually Unicode): 

 #include <stdio.h>
 #include <wchar.h>
 
 int main(void) 
 {
    wchar_t *s = L"\x304A\x306F\x3088\x3046"; /* Japanese hiragana ohayou */
    size_t length;
 
    length = wcslen(s);
    printf("Length in characters = %d\n", length);
    printf("Length in bytes      = %d\n", sizeof(s) * sizeof(wchar_t));
    
    return 0;
 }

C

Standard: ISO C (AKA C 98):

Compiler: g 4.0.2 

 #include <string> // note: not <string.h>
 
 int main()
 {
   std::string s = "Hello, world!";
   // Always in characters == bytes since sizeof(char) == 1
   std::string::size_type length = s.length(); // option 1: In Characters/Bytes
   std::string::size_type size = s.size();     // option 2: In Characters/Bytes
 }

For wide character strings: 

 #include <string>
 
 int main()
 {
   std::wstring s = L"\u304A\u306F\u3088\u3046";
   std::wstring::size_type length = s.length();
}

C#

Platform: .NET Language Version: 1.0 

string s = "Hello, world!";
int clength = s.Length;  // In characters
int blength = System.Text.Encoding.GetBytes(s).length; // In Bytes.

Clean

Clean Strings are unboxed arrays of characters. Characters are always a single byte. The function size returns the number of elements in an array. 

import StdEnv

strlen :: String -> Int
strlen string = size string 

Start = strlen "Hello, world!"

ColdFusion

  #len("Hello World")#

Common Lisp

  (length "Hello World")

Component Pascal

  LEN("Hello, World!")

E

"Hello World".size()

Forth

Interpreter: ANS Forth 

 CREATE s ," Hello world" \ create string "s"
 s C@ ( -- length )

Haskell

Interpreter: GHCi 6.6, Hugs

Compiler: GHC 6.6 

strlen = length "Hello, world!"

IDL

Compiler: any IDL compiler should do 

 length = strlen("Hello, world!")

Java

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.

The length method of String objects gives the number of 16-bit values used to encode a string. 

String s = "Hello, world!";
int length = s.length();

Since Java 1.5, the actual number of characters can be determined by calling the codePointCount method. 

String str = "\uD834\uDD2A"; //U 1D12A
int length1 = str.length(); //2
int length2 = str.codePointCount(0, str.length()); //1

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.

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. 

var str1 = "Hello, world!";
var len1 = str1.length; //13

var str2 = "\uD834\uDD2A"; //U 1D12A represented by a UTF-16 surrogate pair
var len2 = str2.length; //2

JudoScript

 //Store length of hello world in length and print it
 . length = "Hello World".length();

Lua

Interpreter: Lua 5.0 or later. 

 string="Hello world"
 length=#string

mIRC Scripting Language

Interpreter: mIRC 

alias stringlength { echo -a Your Name is: $len($$?="Whats your name") letters long! }

OCaml

Interpreter/Compiler: Ocaml 3.09 

String.length "Hello world";;


Perl

Interpreter: Perl any 5.X 

 my $length = length "Hello, world!";

PHP

 $length = strlen('Hello, world!');

PL/SQL

DECLARE
  string VARCHAR2( 50 ) := 'Hello, world!';
  stringlength NUMBER;
BEGIN
  stringlength := length( string );
END;

Python

Interpreter: Python 2.4 

length = len("The length of this string will be determined")

Ruby

Library: active_support 

 require 'active_support'
 puts "Hello World".chars.length

Scheme

 (string-length "Hello world")

Seed7

 length("Hello, world!")

Smalltalk

 string := 'Hello, world!".
 string size.

Standard ML

Interpreter: SML/NJ 110.60, Moscow ML 2.01 (January 2004)

Compiler: MLton 20061107 

val strlen = size "Hello, world!";

Tcl

Basic version: 

 string length "Hello, world!"

or more elaborately, needs Interpreter any 8.X. Tested on 8.4.12. 

 fconfigure stdout -encoding utf-8; #So that Unicode string will print correctly
 set s1 "hello, world"
 set s2 "\u304A\u306F\u3088\u3046"
 puts [format "length of \"%s\" in characters is %d"  $s1 [string length $s1]]
 puts [format "length of \"%s\" in characters is %d"  $s2 [string length $s2]]

UNIX Shell

With external utilities:

Interpreter: any bourne shell 

 string='Hello, world!'
 length=`echo -n "$string" | wc -c | tr -dc '0-9'`
 echo $length # if you want it printed to the terminal

With SUSv3 parameter expansion modifier:

Interpreter: Almquist SHell (NetBSD 3.0), Bourne Again SHell 3.2, Korn SHell (5.2.14 99/07/13.2), Z SHell 

 string='Hello, world!'
 length="${#string}"
 echo $length # if you want it printed to the terminal


VBScript

Len(string|varname)

Returns the length of the string|varname Returns null if string|varname is null

xTalk

Interpreter: HyperCard 

 put the length of "Hello World"

or 

 put the number of characters in "Hello World"
Retrieved from "https://rosettacode.org/wiki/String_Character_Length?oldid=3841"