Hello world/Line printer

From Rosetta Code
Task
Hello world/Line printer
You are encouraged to solve this task according to the task description, using any language you may know.
Task

Cause a line printer attached to the computer to print a line containing the message:   Hello World!


Note

A line printer is not the same as standard output.

A   line printer   was an older-style printer which prints one line at a time to a continuous ream of paper.

With some systems, a line printer can be any device attached to an appropriate port (such as a parallel port).

11l[edit]

Translation of: Python
V lp = File(‘/dev/lp0’, ‘w’)
lp.write("Hello World!\n")
lp.close()

360 Assembly[edit]

HELLO    CSECT
         PRINT NOGEN
         BALR  12,0
         USING *,12
         OPEN  LNPRNTR
         LA    6,HW
         PUT   LNPRNTR
         CLOSE LNPRNTR
         EOJ
LNPRNTR  DTFPR DEVADDR=SYSLST,IOAREA1=L1
L1       DS    0CL133
HW       DC    C'Hello World!'
         END HELLO

Action![edit]

Proc Main()
 Open(1,"P:",8,0)
 PrintDE(1,"HELLO WORLD!")
 Close(1)
Return

Ada[edit]

Unix[edit]

Assuming that the line printer is attached to /dev/lp0

with Ada.Text_IO; use Ada.Text_IO;

procedure Print_Line is
   Printer : File_Type;
begin
   begin
      Open (Printer, Mode => Out_File, Name => "/dev/lp0");
   exception
      when others =>
         Put_Line ("Unable to open printer.");
         return;
   end;

   Set_Output (Printer);
   Put_Line ("Hello World!");
   Close (Printer);
end Print_Line;

ALGOL 68[edit]

This task is VERY system and hardware dependent. The code below works with Algol 68 Genie and a Linux system without /dev/lp0 but with a remote printer interfaced via CUPS. Extending it to other environments is left as an exercise for the reader.

BEGIN
   STRING printer name = "/dev/lp0";
   FILE line printer;
   IF open (line printer, printer name, stand out channel) = 0 THEN
      put (line printer, ("Hello world", newline));
      close (line printer)
   ELSE
      put (stand error, ("Can't contact line printer on ", printer name, newline));
      put (stand error, ("Trying to use lpr(1)", newline));
      PIPE printer pipe = execve child pipe ("lpr", "", "");
      IF pid OF printer pipe < 0 THEN
	 put (stand error, ("Oh dear, that didn't seem to work either.  Giving up.", newline));
	 stop
      FI;
      put (write OF printer pipe, ("Hello world", newline));
      close (read OF printer pipe);
      close (write OF printer pipe)
   FI
END
Output:
Can't contact line printer on /dev/lp0
Trying to use lpr(1)

Applesoft BASIC[edit]

Assumes a printer card is installed in the Apple II's number 1 expansion slot.

PR#1
PRINT "HELLO WORLD!"

AutoHotkey[edit]

Fileappend, Hello World!, print.txt
Run, print "print.txt"

AWK[edit]

Unix / Linux:

BEGIN { print("Hello World!") >"/dev/lp0" }

BASIC[edit]

Works with: QBasic
Works with: ZX Spectrum Basic
Works with: Liberty BASIC
LPRINT "Hello World!"

BaCon[edit]

Piping data to lp would also work. This example demonstrates writing to a device.

' Hello, printer
READ msg$
DATA "Hello World!\n"

' Assume printer is on /dev/lp0
OPEN "/dev/lp0" FOR DEVICE AS printer
PUTBYTE msg$ TO printer SIZE LEN(msg$)
CLOSE DEVICE printer

BASIC256[edit]

printeron
font "Arial", 20, 50
text 10,100, "Hello World!"
printeroff

BBC BASIC[edit]

      prn% = OPENOUT("PRN:")
      PRINT #prn%, "Hello World!"
      CLOSE #prn%

IS-BASIC[edit]

LPRINT "Hello World!"

Yabasic[edit]

open window 100,100
open printer
text 10, 50, "Hello World!"
close printer
close window

Batch File[edit]

ECHO Hello world!>PRN

C[edit]

Unix[edit]

Assuming that the line printer is attached to /dev/lp0

#include <stdio.h>

int main()
{
   FILE *lp;
   lp = fopen("/dev/lp0","w");
   fprintf(lp,"Hello world!\n");
   fclose(lp);
   return 0;
}

C#[edit]

"My Printer" should be replaced with the friendly name of the printer. This is to avoid the extra step of locating the default printer, which is out of scope of this example.

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class DOCINFOA
{
    [MarshalAs(UnmanagedType.LPStr)]
    public string pDocName;
    [MarshalAs(UnmanagedType.LPStr)]
    public string pOutputFile;
    [MarshalAs(UnmanagedType.LPStr)]
    public string pDataType;
}

[DllImport("winspool.Drv", EntryPoint = "OpenPrinterA", CharSet = CharSet.Ansi, ExactSpelling = true)]
public static extern bool OpenPrinter([MarshalAs(UnmanagedType.LPStr)] string szPrinter, out IntPtr hPrinter, IntPtr pd);

[DllImport("winspool.Drv", EntryPoint = "StartDocPrinterA", CharSet = CharSet.Ansi, ExactSpelling = true)]
public static extern bool StartDocPrinter(IntPtr hPrinter, int level, [In, MarshalAs(UnmanagedType.LPStruct)] DOCINFOA di);

[DllImport("winspool.Drv", EntryPoint = "StartPagePrinter", CharSet = CharSet.Ansi, ExactSpelling = true)]
public static extern bool StartPagePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "EndPagePrinter", CharSet = CharSet.Ansi, ExactSpelling = true)]
public static extern bool EndPagePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "EndDocPrinter", CharSet = CharSet.Ansi, ExactSpelling = true)]
public static extern bool EndDocPrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "ClosePrinter", CharSet = CharSet.Ansi, ExactSpelling = true)]
public static extern bool ClosePrinter(IntPtr hPrinter);

[DllImport("winspool.Drv", EntryPoint = "WritePrinter", CharSet = CharSet.Ansi, ExactSpelling = true)]
public static extern bool WritePrinter(IntPtr hPrinter, IntPtr pBytes, Int32 dwCount, out Int32 dwWritten);

public void HelloWorld()
{
    IntPtr hPrinter;
    bool openSuccessful = OpenPrinter("My Printer", out hPrinter, IntPtr.Zero);
    if (openSuccessful)
    {
        DOCINFOA docInfo = new DOCINFOA();
        docInfo.pDocName = "Hello World Example";
        docInfo.pOutputFile = null;
        docInfo.pDataType = "RAW";

        if (StartDocPrinter(hPrinter, 1, docInfo))
        {
            StartPagePrinter(hPrinter);

            const string helloWorld = "Hello World!";
            IntPtr buf = Marshal.StringToCoTaskMemAnsi(helloWorld);

            int bytesWritten;
            WritePrinter(hPrinter, buf, helloWorld.Length, out bytesWritten);

            Marshal.FreeCoTaskMem(buf);
        }
        if (EndPagePrinter(hPrinter))
            if (EndDocPrinter(hPrinter))
                ClosePrinter(hPrinter);
    }
}

C++[edit]

#include <iostream>
#include <fstream>

int main(){
  std::ofstream lprFile;
  lprFile.open( "/dev/lp0" );
  lprFile << "Hello World!\n";
  lprFile.close();
  return 0;
}

Clipper[edit]

SET PRINT ON
SET CONSOLE OFF
? "Hello World!"
SET PRINT OFF
SET CONSOLE ON

Clojure[edit]

Translated from Java (mechanically, as I don't understand how to test a line printer):

(ns rosetta-code.line-printer
  (:import java.io.FileWriter))

(defn -main [& args]
  (with-open [wr (new FileWriter "/dev/lp0")]
    (.write wr "Hello, World!")))

COBOL[edit]

IDENTIFICATION DIVISION.
PROGRAM-ID. GOODBYE-WORLD-PRINTER.

PROCEDURE DIVISION.
DISPLAY 'Hello World!'
	UPON PRINTER
END-DISPLAY.
STOP RUN.

Commodore BASIC[edit]

Most Commodore printer peripherals operate off the IEC bus commonly as device 4 or 5. It is also possible that some printers may be connected through the RS-232 serial port (typically device 2). This example assumes a device on the IEC bus with a default setting of device 4. This example does not utilize any printer control codes to change font, pitch, quality, graphics, etc., as those can vary between brands and models of printer.

10 rem rosetta code - "Hello World" on line printer
20 open 7,4 : rem open <logical file number>, <device number>
30 print#7,"hello world!" : rem print line as shown to logical file number
40 close 7 : rem close the file number


Common Lisp[edit]

Assuming that the line printer is attached to /dev/lp0

(defun main ()
  (with-open-file (stream "/dev/lp0"
    :direction :output
    :if-exists :append)
    (format stream "Hello World~%")))
(main)

D[edit]

import std.stdio;

void main()
{
    auto lp = File("/dev/lp0", "w");
    lp.writeln("Hello World!");
}

Delphi[edit]

program Project1;

{$APPTYPE CONSOLE}

uses Printers;

var
  lPrinterAsTextFile: TextFile;
begin
  AssignPrn(lPrinterAsTextFile);
  Rewrite(lPrinterAsTextFile);
  Writeln(lPrinterAsTextFile, 'Hello World!');
  CloseFile(lPrinterAsTextFile);
end.

Diego[edit]

Once the caller has met the computer and its printer...

with_computer(comp1)_printer(lp1)_text(Hello World!);

If the caller is the computer...

with_printer(lp1)_text(Hello World!);

Dragon[edit]

select "files"

f2 = fopen("E:\my.txt", "w")
f = "my data"
writeText(f2,f)
flush(f2)
fclose(f2)

EchoLisp[edit]

EchoLisp supports a virtual printer which is not stdout. It is actually an extensible division of the HTML document, with printer pages as subdivisions. Printer and pages may be hidden/shown at convenience.

(printer-font "Courier")       ;; change printer font
(printer-page "ROSETTA CODE")  ;; starts a new page with nice header
(printer-writeln "Hello World!") ;; prints new line (not seen on stdout)

EDSAC order code[edit]

This program uses self-modifying code to loop through an array of characters. Since the EDSAC character set does not include lower-case letters or exclamation marks, we actually print HELLO WORLD followed by a carriage return and a line feed. Strings cannot be null-terminated, because 0 happens to be the character code for P; instead, we mark the final character by including a 1 (which has no printable effect) in the least significant bit.

[ Hello world
  ===========

  A program for the EDSAC

  Can be used to print any character string:
  the string (including necessary *F and #F
  characters) should be stored in sequential
  memory addresses beginning at @+17.

  The last character of the string should be
  marked with a 1 in the least significant
  bit. This can be coded by using D in place
  of F, e.g. AD would be an 'A' as the last
  character

  Works with Initial Orders 2 ]

        T56K
        GK

[  0 ]  O17@    [ Print character        ]

[  1 ]  H17@    [ AND character with 1:  ]
        C15@    [ if the result is 1, we ]
        S15@    [ have reached the end   ]
        E13@    [ of the string          ]

        T14@    [ Modify the orders in   ]
        A@      [ addresses @+0 and @+1  ]
        A16@    [ to point to the next   ]
        T@      [ character              ]
        A1@
        A16@
        T1@
        E@

[ 13 ]  ZF

[ 14 ]  PF
[ 15 ]  PD
[ 16 ]  P1F     [ NB Least significant bit
                  is not part of address,
                  so add 2 not 1         ]

[ 17 ]  *F      [ Letter shift           ]
        HF
        EF
        LF
        LF
        OF
        !F      [ Blank                  ]
        WF
        OF
        RF
        LF
        DF
        @F      [ Carriage return        ]
        &D      [ Line feed + 1          ]

        EZPF

Alternative[edit]

As noted, null in the sense of zero cannot be used as a string terminator on EDSAC. However, it is possible to use the EDSAC null, whose 5-bit code is 10000. The subroutine below demonstrates this.

After the string characters, the terminating null is also sent to the teleprinter. This is because the teleprinter had a one-character buffer, so that an O order did not print its own character immediately, but stored it in the buffer and printed the character set up by the previous O order (Wilkes, Wheeler & Gill, 1951 edition, page 50). Sending the terminating null to the teleprinter ensures that the last character of the string is printed at the same time as the rest.

The EDSAC PC simulator allows .F for null and *F for letter shift, but it seems from WWG that on the original EDSAC these had to be input as K4096F and K2048F respectively.

[Alternative "Hello World" for Rosetta Code]

[Subroutine to print a string.]
[Parameter: A order for first character follows subroutine call (G order).]
[Modified 2022-07-13: A order for first character was formerly passed in 0F.]
[String is terminated with EDSAC null, which is printed]
            T56K GK   [load at 56; set relative addressing]
            A18@ U17@ [plant return link, increasing address by 3
                         instead of 2 as usual]
            S19@      [make A order to load A order after subroutine call]
            T4@       [plant in code]
      [4]   AF        [(planted) load A order after subroutine call]
      [5]   T6@       [loop: plant A order for next character]
      [6]   AF        [load next character]
            UF        [to 0F for printing; keep it in acc]
            OF        [output to teleprinter]
            E12@      [if char >= 0, not EDSAC null]
            A20@      [if char < 0, add 15 to test for EDSAC null]
            G16@      [jump to exit if null]
     [12]   TF        [clear acc]
            A6@ A2F   [inc address in A order above]
                        G5@       [loop back, because top 5 bits = A = 11100]
     [16]   TF        [clear acc on exit (EDSAC convention)]
     [17]   ZF        [(planted) jump back to caller]
     [18]   U3F       [constant for making return link]
     [19]   U1F       [constant for picking up parameter]
     [20]   K2048F    [constant for testing final null]

[Main routine]
            T96K GK   [load at 96; set relative addressing
[Enter with acc = 0]
      [0]   A@ G56F   [call print subroutine]
            A4@       [A order for first character of string]
            ZF        [subroutine returns here; halt machine]
      [4]   K2048F HF EF LF LF OF !F WF OF RF LF DF @F &F K4096F
[The above string is: letter shift, 'HELLO WORLD', CR, LF, null]
            EZ        [define entry point]
            PF        [acc = 0 on entry]
[end]

ERRE[edit]

! Hello World in ERRE language
PROGRAM HELLO
BEGIN
  !$REDIR
  PRINT("Hello World !")
  !$NOREDIR
END PROGRAM

Prints on LPT1: (if exists) without opening a file. Note: !$... is a directive pragma not a part of the language.

Factor[edit]

Prints through Unix "lpr" command.

( scratchpad ) USE: io.encodings.utf8
( scratchpad ) USE: io.launcher
( scratchpad ) "lpr" utf8 [ "Hello World!" print ] with-process-writer

Forth[edit]

Forth systems currently run on everything from bare metal to modern multi-user operating systems and printers are handled differently on each. This demonstration shows a common way that text output is re-directed to printers and/or other devices by vectoring the action of the Forth word EMIT. Emit takes one character off the stack and outputs it to a device. By defining all I/O with the primitive operation EMIT, we can vector the output anywhere we choose, even on hardware with no O/S. Here we show a very basic printer device driver for an embedded system that adds I/O re-direction to the system's Forth language.

\ No operating system, embedded device, printer output example

defer emit                                   \ deferred words in Forth are a place holder for an 
                                             \ execution token (XT) that is assigned later.
                                             \ When executed the deferred word simply runs that assigned routine 

: type ( addr count -- )                     \ type a string uses emit
       bounds ?do  i c@ emit   loop ;        \ type is used by all other text output words in the system

HEX 
: CR   ( -- )  0A emit 0D emit ;             \ send a carriage return, linefeed pair with emit

\ memory mapped I/O addresses for the printer port
B02E   constant scsr                         \ serial control status register 
B02F   constant scdr                         \ serial control data register

: printer-emit ( char -- )                   \ output 'char' to the printer serial port  
         begin   scsr C@ 80 and  until       \ loop until the port shows a ready bit
         scdr C!                             \ C! (char store) writes a byte to an address
         20 ms ;                             \ 32 mS delay to prevent over-runs

: console-emit ( char -- )   ...             \ defined in the Forth system, usually assembler

\ vector control words
: >console     ['] console-emit is EMIT ;     \ assign the execution token of console-emit to EMIT
: >printer     ['] printer-emit is EMIT ;     \ assign the execution token of printer-emit to EMIT

Usage Examples:

S" Hello Console World!" TYPE CR              \ default output goes to console
S" Hello Printer World!" >PRINTER TYPE CR     \ re-direct to printer
>CONSOLE                                      \ return output to console  

Fortran[edit]

Fortran I/O statements refer to logical unit numbers to select the file. The device associated with a unit number depends on the computer installation, and can also be arranged via instructions to the operating system. A value such as 6 is often the default for the lineprinter on mainframe systems but on PCs it might be for the computer screen. Thus the "6". The "1" is the label number of the FORMAT statement.

Output to the lineprinter has a "carriage control character" as the first output position, thus a lineprinter capable of 120 characters to a line would be fed up to 121 characters of output, the first printing position (column one on the lineprinter output) would receive the second character of the output, and so on. This could cause surprises. A FORMAT (I6,etc) rather than FORMAT(1X,I5,etc) used to print a five-digit integer at the start of a line (with the leading space being supplied by the first of the six supplied by I6) works well and saves a little on the complexity of the format statement, but if the integer's value were to exceed 99999, say be 100000, the first character is no longer a space but a one, and so the output will suddenly be one line to a page...

The protocol was to act on the carriage control, then print the line. The character code interpretations were

+ No movement - thus overprint.
  (a blank) Advance one line.
0 Advance two lines - thus leave a blank line.
1 Page throw.

The page-throw was actually a "skip to control column 1"; that is, the lineprinter has an associated paper tape in a loop with holes punched in certain columns of the tape and the tape would be advanced one position for each line advance. The length of the loop matches the number of lines to a page of printout, or was twice that number, etc. A hole in column one of the loop would be aligned (by the human operator during setup) with the top-of-form paper position and when a carriage control of "1" was acted on, the lineprinter would skip forwards until the "1" hole was detected. A carriage control character of "2" would thus skip onwards until a hole in column two was detected - and if there was no such hole, the skip wouldn't stop until the human operator noticed. Thus, many control tapes had all columns punched across, not just one. However, this ability was more properly used in producing vast outputs with subsections to a page suitably marked by suitable holes. The benefit was firstly that the printer skipped to a hole mark more rapidly than via a sequence of "advance one" or "advance two" commands, and secondly, the program did not need to generate such sequences nor have then saved via output spooling. But all relied on the right output being matched to the right tape. This was more typical at COBOL installations.

It is because of the first character disappearing as carriage control that the "list" style output (as in WRITE (6,*) "Hello World!") always starts a line of output with a space. This form does not require a FORMAT statement.

Since for a new job, output would commence with the lineprinter already at the top of a new page, an overprint (no carriage advance) thus means writing to the very first line. If however, top-of-page placement was not assured at your installation, then "1HELLO WORLD!" would do.

      WRITE (6,1)
    1 FORMAT ("+HELLO WORLD!")
      END

FreeBASIC[edit]

' FB 1.05.0 Win64

Open Lpt "Lpt:" As #1 '' prints to default printer
Print #1, "Hello World!"
Close #1

FutureBasic[edit]

The legacy lprint statemenet sends a line of text to the printer. The @(col,row) and %(h,v) options specify where on the page the line should be printed (see the print statement); if you don't specify one of these, the line is printed at the current pen position, usually just under the previously-printed line. lprint is inefficient if you are printing many lines to a page because it reroutes the output each time lprint is executed. In such cases, it's better to execute a sequence of print statements, with the entire sequence preceded by a single route _toPrinter statement and followed by a single route _toScreen statement. FB progammers today use much more sophisticated printer functions designed for complex pagination.

// lprint [@(col,row)|%(h,v)] "Hello,World!"
lprint "Hello,World!"
route _toScreen
close lprint

Go[edit]

package main

import (
	"fmt"
	"os"
)

func main() {
	lp0, err := os.Create("/dev/lp0")

	if err != nil {
		panic(err)
	}

	defer lp0.Close()

	fmt.Fprintln(lp0, "Hello World!")
}

Groovy[edit]

new File('/dev/lp0').write('Hello World!\n')

GUISS[edit]

Start,Programs,Accessories,Notepad,Type:Goodbye World[pling],
Menu:File,Print,Button:OK

Harbour[edit]

SET PRINT ON
SET CONSOLE OFF
? "Hello World!"
SET PRINT OFF
SET CONSOLE ON

Haskell[edit]

import System.Process (ProcessHandle, runCommand)

main :: IO ProcessHandle
main = runCommand "echo \"Hello World!\" | lpr"

Icon and Unicon[edit]

Works in both languages, provided printer is attached to /dev/lp0.

procedure main()
    write(open("/dev/lp0","w"),"Hello, world!")
end

Integer BASIC[edit]

See Applesoft BASIC.

J[edit]

require'print'
print'Hello world!'

Java[edit]

import java.io.FileWriter;
import java.io.IOException;
 
public class LinePrinter {
  public static void main(String[] args) {
    try {
      FileWriter lp0 = new FileWriter("/dev/lp0");
      lp0.write("Hello World!");
      lp0.close();
    } catch (IOException ioe) {
      ioe.printStackTrace();
    }
  }
}

JavaScript[edit]

Works with: Node.js
// This example runs on Node.js
var fs = require('fs');
// Assuming lp is at /dev/lp0
var lp = fs.openSync('/dev/lp0', 'w');
fs.writeSync(lp, 'Hello, world!\n');
fs.close(lp);
Works with: Firefox
Works with: Chromium
document.write("Hello World!");
print(); //Opens a dialog.

Julia[edit]

lineprinter = Sys.iswindows() ? "LPT3" : "/dev/lp0"
lp = open(lineprinter, "w")
write(lp, "Hello world")

Kotlin[edit]

Works with: Ubuntu version 14.04
import java.io.File

fun main(args: Array<String>) {
    val text = "Hello World!\n"
    File("/dev/lp0").writeText(text)
}

Lasso[edit]

File_Write: '/dev/lp0', 'Hello world', -FileOverWrite;

Locomotive Basic[edit]

10 PRINT #8, "Hello World!"

M2000 Interpreter[edit]

We can use printer like a page printer

Printer {
      \\ just change the current layer to Print Page
      \\ Using Layer { } we can change to basic console layer inside any layer
      Print "Hello World!"
}

Or we can use ANSI output using a file for export in Lpt1

Try ok {
      Open "Lpt1" For OutPut As N '' prints to Lpt1 if exist a printer 
      Print #N, "Hello World!"
      Close #N
}
If Not Ok Then Print "Can't Print"

If we have a file in current dir we can use a Dos command:

Dos "Print /d:lpt1 file " +quote$(dir$+"this.txt");

Using ; at the end of DOS command we have no open terminal

Dos "command" [, sleep time after call] [;]

Maple[edit]

lprint("Hello World!")

Mathematica / Wolfram Language[edit]

commandstring = "echo Hello World!  | lpr -P Printer01"
Run[commandstring]

MATLAB / Octave[edit]

Unix[edit]

Assuming that the line printer is attached to /dev/lp0

  fid = fopen('/dev/lp0'); 
  fprintf(fid,'Hello World!\n');
  fclose(fid);

MIXAL[edit]

LPR	EQU	18
STRING	EQU	2000
	ORIG	3000
START	IOC	0(LPR)
	OUT	STRING(LPR)
	HLT
	ORIG	STRING
	ALF	HELLO
	ALF	 WORL
	ALF	D!
	END	START

N/t/roff[edit]

/.ROFF/, being a document formatting language, is especially suited for formatting documents and sending them to printers of nearly all types. In fact, /.ROFF/ has been used to print documents on line printers. To send the output to the line printer, you must compile the source file with the following command on the shell, assuming the source file is file.roff and that the line printer is already setup properly.

nroff -Tlpr file.roff

In this case, you must use NROFF, not TROFF, to compile the source file, as NROFF is better-suited for monospaced, typewriter-style line formatting.

Because /.ROFF/ is a document formatting language, the majority of lines in a typical /.ROFF/ source file is to be textual input. This input is typeset directly onto the output medium. Therefore, the user need not call a procedure to print text to any terminal.

Hello World!

Nim[edit]

Assuming that the line printer is attached to /dev/lp0:

var lp = open("/dev/lp0", fmWrite)
lp.writeln "Hello World"
lp.close()

OCaml[edit]

Assuming that the line printer is attached to /dev/lp0

let () =
  let oc = open_out "/dev/lp0" in
  output_string oc "Hello world!\n";
  close_out oc ;;

Oforth[edit]

File new("/dev/lp0") dup open(File.WRITE) "Hello world\n" << close

Ol[edit]

(define p (open-output-file "/dev/lp0"))
(when p
   (print-to p "Hello world!")
   (close-port p))

OpenEdge/Progress[edit]

OUTPUT TO PRINTER.
PUT UNFORMATTED "Hello world!" SKIP.
OUTPUT CLOSE.

Pascal[edit]

Works with: Free_Pascal
Library: Printer

Example from the FreePascal documentation:

program testprn;
uses printer;
var i: integer;
    f: text;
begin
  writeln ( 'Test of printer unit' );
  writeln ( 'Writing to lst ...' );
  for i := 1 to 80 do
    writeln ( lst, 'This is line', i, '.' #13 );
  close ( lst );
  writeln ( 'Done.' );
  {$ifdef Unix }
  writeln ( 'Writing to pipe ...' );
  assignlst ( f, '|/usr/bin/lpr −m' );
  rewrite ( f );
  for i:= 1 to 80 do
    writeln ( f, 'This is line ', i, '.'#13 );
  close ( f );
  writeln ( 'Done.' )
  {$endif}
end.

Perl[edit]

Assuming that the line printer is attached to /dev/lp0

open O, ">", "/dev/lp0";
print O "Hello World!\n";
close O;

Phix[edit]

If you have not got something appropriate attached, this will just hang. Other values you can try, on windows: "AUX", "COM1", "COM2", "LPT1"

integer fn = open(iff(platform()=WIN32?"PRN":"/dev/lp0"),"w")
if fn=-1 then
    puts(1,"some error")
else
    puts(fn,"Hello World!")
    close(fn)
    puts(1,"success!")
end if
{} = wait_key()

PHP[edit]

<?php
file_put_contents('/dev/lp0', 'Hello world!');
?>
<?php
fclose(STDOUT);
$STDOUT = fopen('/dev/lp0', 'a');
echo 'Hello world!';
?>

Picat[edit]

Works with: Picat
main =>
    Printer = open("/dev/lp0", write),
    println(Printer, "Hello, world!"),
    flush(Printer),
    close(Printer).

PicoLisp[edit]

(out '(lpr "-P" "Printer01")
   (prinl "Hello world") )

PL/I[edit]

hello: procedure options(main);
   put skip list('Hello world.');
end hello;

PostScript[edit]

Technically not really correct, as this has to be sent to the printer directly. It will output Hello world, then, though.

<</PageSize [595 842]>> setpagedevice  % set page size to DIN A4
/Courier findfont                      % use Courier
12 scalefont setfont                   % 12 pt
28 802 moveto                          % 1 cm from the top and left edges
(Hello world) show                     % draw the string

Prolog[edit]

Works with: SWI Prolog
:- initialization(main).

main :-
    open("/dev/lp0", write, Printer),
    writeln(Printer, "Hello, world!"),
    flush_output(Printer),
    close(Printer).

PureBasic[edit]

Library: PureLPRINT
MyPrinter$ = LPRINT_GetDefaultPrinter()
If LPRINT_OpenPrinter(MyPrinter$)
  If LPRINT_StartDoc("Printing a RC-Task")
    LPRINT_Print(Chr(27) + "E") ; PCL reset for HP Printers
    LPRINT_PrintN("Hello World!")
    LPRINT_NewPage()
    LPRINT_EndDoc()
  EndIf
  LPRINT_ClosePrinter()  
EndIf

Python[edit]

Assuming that the line printer is attached to /dev/lp0:

lp = open("/dev/lp0")
lp.write("Hello World!\n")
lp.close()

If the above code gives you the error "IOError: File not open for writing", try:

lp = open("/dev/lp0","w")
lp.write("Hello World!\n")
lp.close()

Racket[edit]

#lang racket
(define (print text)
  ;; try lpr first
  (define lpr-exe (find-executable-path "lpr"))
  ;; otherwise use a special file
  (if lpr-exe
    (with-input-from-string (~a text "\n") (λ() (void (system* lpr-exe))))
    (with-output-to-file #:exists 'append
      (case (system-type) [(windows) "PRN"] [else "/dev/lp0"])
      (λ() (displayln text)))))
(print "Hello World!")

Raku[edit]

(formerly Perl 6)

my $lp = open '/dev/lp0', :w;
$lp.say: 'Hello World!';
$lp.close;

Or using given to avoid having to write the variable name repeatedly:

given open '/dev/lp0', :w {
    .say: 'Hello World!';
    .close;
}

REXX[edit]

There is no direct way for REXX programs to write to the printer, but a shell command could be used.

In DOS (or under Windows):

/*REXX program prints a string to the  (DOS) line printer  via redirection to a printer.*/
$= 'Hello World!'                                /*define a string to be used for output*/
'@ECHO'   $    ">PRN"                            /*stick a fork in it,  we're all done. */

Ring[edit]

   lp = fopen("/dev/lp0","w")  fputs(lp,"Hello world!")  fclose(lp)

RPG[edit]

Works with: ILE RPG
      Fqsysprt   O    F   80        printer                                 
      C                   except                                            
      C                   seton                                        LR   
      Oqsysprt   E                                                          
      O                                           11 'Hello world'

Ruby[edit]

Assumes that lpr command reaches printer.

open("| lpr", "w") { |f| f.puts "Hello World!" }

Run BASIC[edit]

 shell$("echo \"Hello World!\" | lpr")

Rust[edit]

Unix[edit]

use std::fs::OpenOptions;
use std::io::Write;

fn main() {
    let file = OpenOptions::new().write(true).open("/dev/lp0").unwrap();
    file.write(b"Hello, World!").unwrap();
}

Salmon[edit]

Assuming /dev/lp0 accesses the printer:

open_output_text_file("/dev/lp0").print("Hello World!");

Assuming lpr is a command that prints to a printer:

`echo "Hello World!" | lpr`;

Scala[edit]

Library: Scala

All platforms[edit]

import java.awt.print.PrinterException
import scala.swing.TextArea

object LinePrinter extends App {
  val (show, context) = (false, "Hello, World!")
  try // Default Helvetica, 12p
    new TextArea(context) {
      append(" in printing.")
      peer.print(null, null, show, null, null, show)
    }
  catch {
    case ex: PrinterException => ex.getMessage()
  }
  println("Document printed.")
}

Unix[edit]

Assuming device is attached to lp0

object LinePrinter extends App {
  import java.io.{ FileWriter, IOException }
  {
    val lp0 = new FileWriter("/dev/lp0")
    lp0.write("Hello, world!")
    lp0.close()
  }
}

Scheme[edit]

Unix[edit]

Assuming device is attached to lp0

(call-with-output-file "/dev/lp0"
  (lambda (printer)
    (write "Hello World!" printer)))

Seed7[edit]

Assuming that the line printer is attached to /dev/lp0:

$ include "seed7_05.s7i";
 
const proc: main is func
  local
    var file: lp is STD_NULL;
  begin
    lp := open("/dev/lp0", "w");
    writeln(lp, "Hello world!");
    close(lp);
  end func;

Sidef[edit]

Sys.open(\var fh, '>', '/dev/lp0') \
    && fh.say("Hello World!")      \
    && fh.close

Simula[edit]

Works with: SIMULA-67
BEGIN
   OUTTEXT("Hello World!");
   OUTIMAGE
END

Slope[edit]

(file-append-to "/dev/lp0" "Hello world!")

Smalltalk[edit]

Works with: Smalltalk/X

portable (dispatches to one of bellow):

s := PrinterStream defaultPrinter new.
s nextPutLine:'Hello, world'.
s close

Unix[edit]

s := PipeStream writingTo:'lpr'.
s nextPutLine:'Hello, world'.
s close.

alternative:

'/dev/lp0' asFilename writingFileDo:[:s |
  s nextPutLine:'Hello, world'.
]

Windows[edit]

s := WinPrinterStream new.
s nextPutLine:'Hello, world'.
s close.

SNOBOL4[edit]

In SNOBOL4, variables can be associated with input and output files. Assigning a value to an output-associated variable also writes it to the associated output file. (Likewise, accessing a variable associated with an input file returns as its value the next record from the associated input file.) By default, the variable "input" is associated with standard input, and the variable "output" is associated with standard output.

     output = "Hello, world."

You can associate the variable "print" with lpt1 (the default local printer port) using the output() function:

     output(.print,25,"lpt1")
     print = "Hello, world."

Swift[edit]

import Foundation

let out = NSOutputStream(toFileAtPath: "/dev/lp0", append: true)
let data = "Hello, World!".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
out?.open()
out?.write(UnsafePointer<UInt8>(data!.bytes), maxLength: data!.length)
out?.close()

Tcl[edit]

Unix[edit]

exec lp << "Hello World!"
set f [open |lp w]
puts $f "Hello World!"
close $f

Windows[edit]

set f [open prn w]
puts $f "Hello World!"
close $f

UNIX Shell[edit]

Use one of the following lines.

# Use the default printer queue, with lp(1) or lpr(1).
#  1. The system must have a printer queue.
#  2. The printer queue must understand plain text.
#  3. System V has lp(1). BSD has lpr(1).
#     CUPS has both lp(1) and lpr(1).
#
echo 'Hello World!' | lp
echo 'Hello World!' | lpr

# Use a character device.
#  1. The device must understand plain text.
#  2. You must have write permission for the device.
#  3. Some systems have /dev/lp0, /dev/lp1, ...
#  4. BSD has /dev/lpt0, /dev/lpt1, ... for the parallel ports;
#     and /dev/ulpt0, /dev/ulpt1, ... for the USB printers.
# Note that intermingling can occur if two processes write to the device at the
# same time. Using the print spooler method above avoids this problem,
#
echo 'Hello World!' >/dev/lp0
echo 'Hello World!' >/dev/lpt0
echo 'Hello World!' >/dev/ulpt0

Wisp[edit]

Unix[edit]

Assuming that the device is attached to lp0

call-with-output-file "/dev/lp0"
  λ : printer
      write "Hello World!" printer

Wren[edit]

It is not currently possible to communicate with the printer using Wren-cli. So we need to write a minimal embedded program (no error checking) so the C host can do this for us.

/* hello_world_line_printer.wren */

class C {
    foreign static lprint(s)
}

C.lprint("Hello World!")


We now embed this in the following C program, compile and run it.

/* gcc hello_world_line_printer.c -o hello_world_line_printer -lwren -lm */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "wren.h"

/* C <=> Wren interface functions */

void C_lprint(WrenVM* vm) {
    const char *arg = wrenGetSlotString(vm, 1);
    char command[strlen(arg) + 13];
    strcpy(command, "echo \"");
    strcat(command, arg);
    strcat(command, "\" | lp");
    system(command);
}

WrenForeignMethodFn bindForeignMethod(
    WrenVM* vm,
    const char* module,
    const char* className,
    bool isStatic,
    const char* signature) {
    if (strcmp(module, "main") == 0) {
        if (strcmp(className, "C") == 0) {
            if (isStatic && strcmp(signature, "lprint(_)") == 0)  return C_lprint;
        }
    }
    return NULL;
}

static void writeFn(WrenVM* vm, const char* text) {
    printf("%s", text);
}

char *readFile(const char *fileName) {
    FILE *f = fopen(fileName, "r");
    fseek(f, 0, SEEK_END);
    long fsize = ftell(f);
    rewind(f);
    char *script = malloc(fsize + 1);
    fread(script, 1, fsize, f);
    fclose(f);
    script[fsize] = 0;
    return script;
}

int main(int argc, char **argv) {
    WrenConfiguration config;
    wrenInitConfiguration(&config);
    config.writeFn = &writeFn;
    config.bindForeignMethodFn = &bindForeignMethod;
    WrenVM* vm = wrenNewVM(&config);
    const char* module = "main";
    const char* fileName = "hello_world_line_printer.wren";
    char *script = readFile(fileName);
    WrenInterpretResult result = wrenInterpret(vm, module, script);
    wrenFreeVM(vm);
    free(script);
    return 0;
}

X86 Assembly[edit]

;Assemble with: tasm, tlink /t
;assume direction bit is clear (so si increments)
        .model  tiny
        .code
        org     100h
start:  mov     si, offset msg  ;point to message
        jmp     pr20

pr10:   mov     ah, 0           ;write character to printer
        mov     dx, 0           ;LPT1
        int     17h
pr20:   lodsb                   ;al, ds:[si++]
        cmp     al, 0           ;terminator?
        jne     pr10            ;loop if not
        ret                     ;return to OS

msg     db      "Hello World!", 0ch, 0  ;0ch = form feed (for laser printer)
        end     start

XPL0[edit]

code Text=12;
Text(2, "Hello World!
");

The 2 directs the output to the printer (LPT1). Output is usually directed to the console using device code 0 instead.

A carriage return and line feed are normally required to make a line printer actually print. (A laser or inkjet printer may require a form feed.) However, some printers, or printer drivers, have a timeout feature that print even without the CR+LF (or FF). The CR+LF can simply be included in the string as shown. Another method is to include the CR+LF control characters as ^M^J.