“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。 #DaP=k"XV
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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》。 @bQ!zCI
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以下是用不同语言写成的Hello World程序的几个例子: 9c5!\m1
Ada oBUh]sR{.
with Ada.Text_Io; use Ada.Text_Io; &8Wlps`
procedure Hello is x9*ys;~w
begin
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Put_Line ("Hello, world!"); mahi7eU
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end Hello; m0iV m|
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汇编语言 U~g@TfU;
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x86 CPU,DOS,TASM QBj Y&(vY
MODEL SMALL ;^.9#B,<
IDEAL /2:Q6J
STACK 100H vadM1c*z
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DATASEG j[T%'%
HW DB 'Hello, world!$' er\:U0fr#@
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CODESEG :A$wX$H01
MOV AX, @data >#i $Tw
MOV DS, AX xucIjPi]
MOV DX, OFFSET HW .%hQJ{vf-^
MOV AH, 09H B=x~L
INT 21H T.euoFU{Z
MOV AX, 4C00H uk{J@&F
INT 21H G+Ei#:W,
END rH^/8|}&s
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x86 CPU,GNU/Linux,NASM #y`k$20"
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). e6es0D[>5
;Enter this into "hello.asm" then type: - coy@S=.'
;"nasm -f elf hello.asm" ~g96o81V
;"ld hello.o -o hello" E#~2wqK
;"./hello" Gm*Uv6?H?
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section .data ;data section declaration Pb=rFas*C
msg db 'Hello World!',0AH [b pwg&Oo
len equ $-msg ;string length b2%blQgo
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section .text ;code section declaration RQJ9MGw
global _start ;entry point (start of execution) .hnF]_QQ
_start: mov edx,len ;string length .kzms
mov ecx,msg ;string start ;W4:#/~14
mov ebx,1 ;file handle: stdout a:xgjUt&5
mov eax,4 ;sys_write {N@Y<=+:
int 80h ;kernel system call o9^$hDs,si
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mov ebx,0 ;return value %1@.7uTN
mov eax,1 ;sys_exit Suj}MEiv
int 80h ;kernel system call u;{T2T
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x86 CPU,Windows,MASM32 |7Yvq%E
.386 \6jF{
.model flat,stdcall t-a`.y
option casemap:none (T`q++
;Include 文件定义 y#GCtkhi
include windows.inc )[RpZpd`*
include user32.inc \j/}rzo]
includelib user32.lib )uuwwz
include kernel32.inc 7j{Te)"
includelib kernel32.lib K-ju ,4A
;数据段 I[a%a!QO
.data [j1^$n 8V
szCaption db 'A MessageBox!',0 mKMGdN~
szText db 'Hello,world!',0 sF,
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;代码段 Xd5!
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.code +&zb^C`J
start: !cv6 #:
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK X$ejy/+.
invoke ExitProcess,NULL s:G[Em1
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end start CJtr0M<U+
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BEGIN { print "Hello, world!" } MH2OqiCI
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BASIC re2Fv:4{
传统版BASIC(例如GWBASIC): c@)p Ki#W
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10 PRINT "Hello, world!" ?cA8P.?^A
20 END aslNlH 6
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或在提示符输入: oa?!50d
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?"Hello, world!":END FDZeIj9uF
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现代版BASIC(例如Quick BASIC): /,-h%gj
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Print "Hello, world!" &P{o{
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以下的语句在Quick BASIC中同样有效: I>(;bNgNE
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? "Hello,world!" V%VrAi.
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GET "LIBHDR" j
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LET START () BE uVoF<={
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WRITES ("Hello, world!*N") 8b8e^\l(
$) MLEIx()
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Befunge 9
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C Ncs4<"{$
#include <stdio.h> ?HEo9/ *7
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int main(void) Wo<PmSt9i
{ U4
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printf("Hello, world!\n"); S&;T_^|
return 0; {Zd)U "
} _#y(w%
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C++ ;p?42rCIcl
#include <iostream> 1( QWt
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int main() gdkLPZ<<
{ K{eqB!@j
std::cout << "Hello, world!" << std::endl; zyQ,unu
return 0; vfk7J5y
} c,{&
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C++/CLI DkF@XK0c3
int main() cP$wI;P
{ [<@A8Q5,y
System::Console::WriteLine("Hello, world!"); ~(*co[_
} 6qmo
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C# (C Sharp) r P<d[u
class HelloWorldApp 3thG*^C5
{ Q
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public static void Main() c)n0D=
{ 6@,'m
System.Console.WriteLine("Hello, world!"); Q
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} 6cgpg+-a
} )\:lYI}Wpm
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COBOL ^bY^x+d
IDENTIFICATION DIVISION. K"t:B
PROGRAM-ID. HELLO-WORLD. eKU@>5
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ENVIRONMENT DIVISION. 0qotC6l~_w
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DATA DIVISION. y:^>(l #;
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PROCEDURE DIVISION. nJM9c[Ou^H
DISPLAY "Hello, world!". f6aT[Nw<
STOP RUN. 56j/w[&8
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