“Hello, World!”程序是一个只在计算机屏幕上打印出“Hello, World!”(英语,意为“世界,你好!”)字串的计算机程序。该程序通常是计算机程序设计语言的初学者所要学习编写的第一个程序。它还可以用来确定该语言的编译器、程序开发环境以及运行环境已经正确安装。 ZcJa:
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 *UL++/f
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以下是用不同语言写成的Hello World程序的几个例子: M~'4>h}
Ada u}_,4J
with Ada.Text_Io; use Ada.Text_Io; HK}br!?
procedure Hello is Rhw- 49AWx
begin >}~\*Y\8@
Put_Line ("Hello, world!"); lL8pIcQW
end Hello; jGm`Qg{<
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汇编语言 CG#lpAs
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x86 CPU,DOS,TASM #3VOC#.
MODEL SMALL Kd='l~rby
IDEAL {"v~1W)
STACK 100H nR%ey"
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DATASEG jpwR\"UJ
HW DB 'Hello, world!$' }xx"
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CODESEG 6DkFI kS
MOV AX, @data 7{z\^R^O
MOV DS, AX IL0e:-@!0
MOV DX, OFFSET HW 4 H<.
MOV AH, 09H wak:"B[
INT 21H 8n&Gn%DvX
MOV AX, 4C00H CJa`[;i0y
INT 21H X&LaAqlSG
END s78MXS?py
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x86 CPU,GNU/Linux,NASM s7d4)A%
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). $.+_f,tU
;Enter this into "hello.asm" then type: AONEUSxJ
;"nasm -f elf hello.asm" XJZ\ss
;"ld hello.o -o hello" !eu\ShI
;"./hello" J#'8]p3E
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section .data ;data section declaration v:F_!Q
msg db 'Hello World!',0AH Iwx~kvz\_(
len equ $-msg ;string length 1fH2obI~X
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section .text ;code section declaration BQ:hUF3
global _start ;entry point (start of execution) {{r.?m#{
_start: mov edx,len ;string length JW},7Ox
mov ecx,msg ;string start P#!^9)3
mov ebx,1 ;file handle: stdout \Ota~A
mov eax,4 ;sys_write FoQy@GnM5
int 80h ;kernel system call
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mov ebx,0 ;return value rD;R9b"J
mov eax,1 ;sys_exit a$=He
int 80h ;kernel system call \1He9~6
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x86 CPU,Windows,MASM32 p:NIRs
.386 h-<Qj,L{W
.model flat,stdcall \
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option casemap:none Xaw ~Hh)
;Include 文件定义 zCdcwTe
include windows.inc hHk9O?
include user32.inc *e25!#o1
includelib user32.lib bOolBKV
include kernel32.inc Ya&\ b 6
includelib kernel32.lib ]7{
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;数据段 $DlO<
.data /,,IM/(6^
szCaption db 'A MessageBox!',0 DJZ$M
szText db 'Hello,world!',0 !%'"l{R
;代码段 yNhRh>l
.code }60/5HNr
start: OWc~=Cr
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK +O)Y7k{?C5
invoke ExitProcess,NULL J(:y-U
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LC4W?']/
end start 9S|a!9J
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BEGIN { print "Hello, world!" } K: |-s4=
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BASIC YrsE
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传统版BASIC(例如GWBASIC): Nt|Fw$3*5{
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10 PRINT "Hello, world!" je`Inn<
20 END [:zP]l.|
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或在提示符输入: uO)vGzt3^x
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?"Hello, world!":END &x\cEI)!
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现代版BASIC(例如Quick BASIC): CFUn1^?0
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Print "Hello, world!" c#f@v45
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以下的语句在Quick BASIC中同样有效: q+} \(|
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? "Hello,world!" <Uc
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BCPL dQz#&&s-
GET "LIBHDR" S!n?b|_
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LET START () BE 9o4h~Imu
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WRITES ("Hello, world!*N") *I[tIO\
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Befunge ~(#iGc]7
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Brainfuck 1:r#m- \
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C 'tDUPm38
#include <stdio.h> N}1yDN
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int main(void) 1{wbC)
{ 0yvp>{;p
printf("Hello, world!\n"); )Ay 90Wt
return 0; k]^ya?O]p
} g~$UU(HX
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C++ y=.bn!u}z
#include <iostream> }dHdy{$
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int main() "vT$?IoEV
{ (,tu7u{
std::cout << "Hello, world!" << std::endl; V#5$J Xp
return 0; >x3lA0m
} =R~zD4{"
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C++/CLI .ANR|G
int main() r/HCWs|
{ e(xuy'4r
System::Console::WriteLine("Hello, world!"); 3Pllxq<n
} )TKn5[<4
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C# (C Sharp) W&:0J
class HelloWorldApp :e nR8MS
{ RGs7Hc
public static void Main() IVkB)9IW
{ aidQ,(PDj
System.Console.WriteLine("Hello, world!"); *coUHbP9>
} vV*J;%MO
} (ie%zrhS
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# =tw
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COBOL g2m*Q%
IDENTIFICATION DIVISION. aK95&Jyw&
PROGRAM-ID. HELLO-WORLD.
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ENVIRONMENT DIVISION. V-@4s}zX
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DATA DIVISION. Kx&"9g$
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PROCEDURE DIVISION. @ci..::5
DISPLAY "Hello, world!". Ie!&FQe2