String Byte Length

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 byte length of a string. This means encodings like UTF-8 may need to be handled specially, as there is not necessarily a one-to-one relationship between bytes and characters, and some languages recognize this.

For character length, see String Character 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!";
   std::string::size_type length = s.length(); // option 1
   std::string::size_type size = s.size();     // option 2
 }

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 length = s.Length;

ColdFusion

  #len("Hello World")#

Common Lisp

  (length "Hello World")

Component Pascal

  LEN("Hello, World!")

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

Compiler: any Java compiler should do

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

JavaScript

var s = "Hello, world!";
var len = s.length;  // returns an integer

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

 string="Hello world"
 print string.length

or

 puts "Hello World".length

Scheme

 (string-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"