“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。 !8R@@,_v
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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》。 Tf x :"u
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以下是用不同语言写成的Hello World程序的几个例子: zN{JJ3-
Ada R J~%0
with Ada.Text_Io; use Ada.Text_Io; gg^1b77hT
procedure Hello is P=`1 rjPE
begin 8uch i
Put_Line ("Hello, world!"); _<zfQZai
end Hello; L9FHgl?
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汇编语言 \NK-L."[
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x86 CPU,DOS,TASM Puh$%;x
MODEL SMALL aY)2eY
IDEAL _Mt Qi
STACK 100H g5S?nHS}
sbo^"&%w
DATASEG WR#0<cz(
HW DB 'Hello, world!$' PB53myDQ
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CODESEG Quzo8u
MOV AX, @data p $ouh
MOV DS, AX lA^+Flh
MOV DX, OFFSET HW {6G?[
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MOV AH, 09H .Cz %:%9
INT 21H * R d#{Io7
MOV AX, 4C00H 6CCbBA
INT 21H ^"i~DC
END `t(D!
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x86 CPU,GNU/Linux,NASM G7@O`N8'
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). wRtZ`o
;Enter this into "hello.asm" then type: / i_ @
;"nasm -f elf hello.asm" rwE%G>Vb
;"ld hello.o -o hello" ^2JpWY:|7
;"./hello" j_cs;G: "
. +
section .data ;data section declaration PftxqJz
msg db 'Hello World!',0AH (Yb[)m>fQ}
len equ $-msg ;string length LF*&(NC
0;.<~;@h
section .text ;code section declaration JkQ\)^5v
global _start ;entry point (start of execution) ;V5yXNQ
_start: mov edx,len ;string length ~1kXUWq3
mov ecx,msg ;string start k2 Q
qZxm!
mov ebx,1 ;file handle: stdout 5x8+xw3Eh
mov eax,4 ;sys_write XYEv&-M`?w
int 80h ;kernel system call f)Xr!7
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mov ebx,0 ;return value Anm=*;*M`
mov eax,1 ;sys_exit %|"g/2sF[G
int 80h ;kernel system call k\`S
lb1
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x86 CPU,Windows,MASM32 nV_8Ke
.386 d3;qsUh$yv
.model flat,stdcall V5`^Y=X(%
option casemap:none &M/>tEZ)
;Include 文件定义 I+(/TP
include windows.inc M*eJ
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include user32.inc 3oy~=
includelib user32.lib OJAIaC\
include kernel32.inc EZDy+6b
includelib kernel32.lib S9| a$3K'
;数据段 6Jz^
.data LiQgR
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szCaption db 'A MessageBox!',0 I5m][~6.?
szText db 'Hello,world!',0 ~b~2
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;代码段 *^%*o?M~
.code zj{r^D$
start: |JF@6
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK lB91An
invoke ExitProcess,NULL ~lAKJs#{
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> M~Ttb29{
end start Cq)IayD@
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BEGIN { print "Hello, world!" } eLD|A=X?
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BASIC ~]C%/gEh
传统版BASIC(例如GWBASIC): x#.C4O09
Q Fm|-j
10 PRINT "Hello, world!" b</9Ai=
20 END NB_)ZEmF
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或在提示符输入: PQN@JaD
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?"Hello, world!":END -_C#wtC
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现代版BASIC(例如Quick BASIC): 2{Vcb
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Print "Hello, world!" DV)3
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以下的语句在Quick BASIC中同样有效: -s|8<A||"
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? "Hello,world!" d?AlI
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BCPL )rW&c-'
GET "LIBHDR" :r#)z4d5
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LET START () BE ev1 W6B-a
$( 8lF\v /vN
WRITES ("Hello, world!*N") 1NQbl+w#I
$) lKWPTCU
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Befunge m%;D
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C W[EKD 7
#include <stdio.h> 3pf[M{dG
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int main(void) I&n
{ X@@8"@/u|*
printf("Hello, world!\n"); y Rp"jcD
return 0; 98=wnWX6$
} H ]4Hj
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C++ 8k
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#include <iostream> s,#>m*Rh
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int main() +)zOer,
{ `.s({/|[
std::cout << "Hello, world!" << std::endl; t!Sq A(-V
return 0; V%$/#sza
} v8AS=sY4r
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C++/CLI ]smkTo/
int main() qC
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{ [Nn`l,
System::Console::WriteLine("Hello, world!"); }neY<{z
} c'/l,k
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C# (C Sharp) ~4"qV_M
class HelloWorldApp WAdCF-S
{ 4pw6bK,s2\
public static void Main() q6YX M
{ quY:pqG38q
System.Console.WriteLine("Hello, world!"); MSf;ZB
} KYzv$oK
} F:x [
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COBOL H":oNpfb
IDENTIFICATION DIVISION. 2UGsYQn
PROGRAM-ID. HELLO-WORLD. 4apL4E"r
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ENVIRONMENT DIVISION. x _c[B4Tw
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DATA DIVISION. p]3?gK-
I? ,>DHUX
PROCEDURE DIVISION. I`NjqyTW
DISPLAY "Hello, world!". $D G?M6
STOP RUN. ~69&6C1Ch
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P.gb1$7<
Common Lisp '7O3/GDK
(format t "Hello world!~%") bhniB@<
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{<<U^<6}
DOS批处理 6gc>X%d `K
@echo off ,v"YqD+GC5
echo "Hello, world!" x.-+[l[1
!
/ m=HG^!
c38D}k^):
Eiffel 4?B\O`sy.
class HELLO_WORLD AK@9?_D
'-zD
creation dAuJXGo
make 82l~G;.n3
feature &jmRA