“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。 M#2U'jy
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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》。 &WU*cfJn)A
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以下是用不同语言写成的Hello World程序的几个例子: R~(.uV`#j
Ada Ym2m1
with Ada.Text_Io; use Ada.Text_Io;
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procedure Hello is g%P4$|C9i
begin Vta;ibdeqW
Put_Line ("Hello, world!"); 5DUPsV
end Hello; df rr.i
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汇编语言 mpAh'f4$*
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x86 CPU,DOS,TASM O5%F-}(:
MODEL SMALL iW$i%`>
IDEAL RIc<
STACK 100H l7um9@[4
;.a)r
DATASEG V$D
d 7
HW DB 'Hello, world!$' PelV67?M
HJrg
CODESEG Om{ML,d
MOV AX, @data CI{TgL:l
MOV DS, AX =S +:qk
MOV DX, OFFSET HW Jev.o]|_,
MOV AH, 09H >Cc$ P
INT 21H z<=t3dj
MOV AX, 4C00H #Og_q$})f
INT 21H HWZ*Htr
END {IwYoR aXa
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x86 CPU,GNU/Linux,NASM 2yc\A3ft#
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). '|r!yAO6
;Enter this into "hello.asm" then type: Q+N @j]'
;"nasm -f elf hello.asm" <(%uOo$
;"ld hello.o -o hello" :9qB{rLi}
;"./hello" w]XBq~KO
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section .data ;data section declaration kS!*kk*a
msg db 'Hello World!',0AH % m$Mnx
len equ $-msg ;string length PrxXL/6
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section .text ;code section declaration 2ARh-zLb
global _start ;entry point (start of execution) 3Mt6iZW
_start: mov edx,len ;string length 4B(qVf&M
mov ecx,msg ;string start t|_g O!w8
mov ebx,1 ;file handle: stdout h|Qh/jCX
mov eax,4 ;sys_write b,`N;*
int 80h ;kernel system call 9r}}m0
b5C #xxIO
mov ebx,0 ;return value ibL;99 #
mov eax,1 ;sys_exit ?~8V;Qn
int 80h ;kernel system call tO$M[P=b
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x86 CPU,Windows,MASM32 8a1{x(\z.
.386 1' s^W
.model flat,stdcall i^Q^F
option casemap:none KDk^)zv%!
;Include 文件定义 9m>_qWaA
include windows.inc xRmB?kM3]5
include user32.inc EA72%Y9F
includelib user32.lib Jr
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include kernel32.inc :-n4!z"k
includelib kernel32.lib u/WkqJvw#
;数据段 S5M t?v|K
.data 7IRn
szCaption db 'A MessageBox!',0 6A<aelE*i
szText db 'Hello,world!',0 ~C3-E %h@Z
;代码段 K[Kc'6G
.code 7EUaf;d^
start:
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK $TiAJ}:
invoke ExitProcess,NULL w}?\Q,
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> lC{m;V2
end start Wit1WI;18
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AWK :mL.Y em*'
BEGIN { print "Hello, world!" } IAQ=d4V&
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BASIC 54-x 14")
传统版BASIC(例如GWBASIC): [a2/`ywdV
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10 PRINT "Hello, world!" 7P]pk=mo
20 END 7UfyOOFa
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或在提示符输入: `Jo}/c5R
z> SCv;Q
?"Hello, world!":END =Vfj#WL
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现代版BASIC(例如Quick BASIC): pVM;xxJ
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Print "Hello, world!" ^;e`ZtcI
/on p<u
以下的语句在Quick BASIC中同样有效: Fwtwf{9I
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? "Hello,world!" Z2r\aZ-d`
6Z 7$ZQ~
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BCPL .
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GET "LIBHDR" 1JY4E2Q
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LET START () BE o3yZC z
$( Wl{Vz
WRITES ("Hello, world!*N") uPpP")
$) #HML=qK~
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Befunge K4~dEZ
"!dlrow olleH">v Sq,x@
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