“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。 ?/9]"HFHN
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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》。 EShc1KPqc
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以下是用不同语言写成的Hello World程序的几个例子: Yr-a8aSTE5
Ada <.CO{L\e
with Ada.Text_Io; use Ada.Text_Io; CTp~bGIv!=
procedure Hello is N{46DS
begin ag]b]K
Put_Line ("Hello, world!"); e]!Vxn3
end Hello; xY(+[T!OF
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vnMt>]w-}
汇编语言 oD4NQR
[@U8&W
x86 CPU,DOS,TASM F8Z<JcOI
MODEL SMALL h#@l'Cye
IDEAL B~^MhX
+j
STACK 100H yGT"k,a
J0a]Wz%
DATASEG Z2)f$ c
HW DB 'Hello, world!$' Q2cF++Q1
B)O=wx
CODESEG LG'JQGl5
MOV AX, @data I.r&;
MOV DS, AX iC?s`c0B
MOV DX, OFFSET HW P0~3<h?U8
MOV AH, 09H DalQ.
INT 21H yA?>v'K
MOV AX, 4C00H >/;\{IG
Wn
INT 21H h?j;*|o-
END g9}u6q
v]F q}I"
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x86 CPU,GNU/Linux,NASM il<D e]G
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). \#1!qeF
;Enter this into "hello.asm" then type: Dx$74~2e
;"nasm -f elf hello.asm" z}.!q{Q
;"ld hello.o -o hello" `)\_
;"./hello" z@>z.d4
#bUWF|zfT
section .data ;data section declaration ZLyJ
msg db 'Hello World!',0AH =rl/l8|P
len equ $-msg ;string length Re5m
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section .text ;code section declaration jV\M`=4IC
global _start ;entry point (start of execution) kQC>8"
_start: mov edx,len ;string length C, n]9
mov ecx,msg ;string start kuu9'Sqc'b
mov ebx,1 ;file handle: stdout <4bv=++pS
mov eax,4 ;sys_write F+*>q
int 80h ;kernel system call 1B'i7
r/HKxXT
mov ebx,0 ;return value cBmo#:>'
mov eax,1 ;sys_exit {.bLh0
int 80h ;kernel system call cCFSPT2fq[
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x86 CPU,Windows,MASM32 <~:
g
.386 +?mZ_sf8w
.model flat,stdcall X^aujK^@
option casemap:none _ZR2?y-M
;Include 文件定义 1
#EmZ{*
include windows.inc 4=q\CK2 ^A
include user32.inc oxGOn('
includelib user32.lib Qz<v. _
include kernel32.inc !3HMGzt
includelib kernel32.lib .bpxSU%X
;数据段 j4G,Z4
.data A;2?!i#f
szCaption db 'A MessageBox!',0 r-'j#|^tz
szText db 'Hello,world!',0 8(g:i#~
;代码段 0'L+9T5
.code H 5sj%
v
start: +j`*?pPD(.
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK eRv3ZHH
invoke ExitProcess,NULL {H0B"i
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> cT.1oaAM0
end start ,Zs-<e"
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AWK Dk[[f<H_{
BEGIN { print "Hello, world!" } Kq.)5%~>
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BASIC #kV=;(lq
传统版BASIC(例如GWBASIC): w/Q'T&>b/
$=H\#e)]Ug
10 PRINT "Hello, world!" wcV~z:&^5
20 END >i`'e~%
[qid4S~r,&
或在提示符输入: \UN7lDH
3 YRhqp"E
?"Hello, world!":END se(_`a/4Q
=\_MJ?A$
现代版BASIC(例如Quick BASIC): G]5'U"c j3
!xa,[$w(^
Print "Hello, world!" <L5[#V_
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以下的语句在Quick BASIC中同样有效: Vl'|l)b4W
BBy/bc!
? "Hello,world!" 8HTV"60hTs
lm@<i4%$F
^#"!uCq]gM
BCPL oOJN?97!k
GET "LIBHDR" rY($+O@a<
%iF<
px?Vc
LET START () BE qY0GeE>N
$( "4L' 2w+
WRITES ("Hello, world!*N") }HXNhv-K
$) ]M= 3Sn8}
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v\f 41M7D
Befunge nc&V59*
"!dlrow olleH">v FtE%<QHt
, X"'}1o
^_@ ],' n!:>
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G~^Pkl3%T
Brainfuck w{Dk,9>w)
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< [h,T.zpa
+++++++++++++++.>.+++.------.--------.>+.>. 13
n; !t?jnf.
#nn2odR
C |4wVWJ7
#include <stdio.h> }4ta#T Ea
| F:?
int main(void) ]36 R_Dp
{ TQbhK^]
printf("Hello, world!\n"); rXfQ_
return 0; ywCE2N<-V?
} %:((S]vAi
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C++ b~v
#include <iostream> Q{mls
f'R^MX2
int main() ~@L$}Eu
{ H
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std::cout << "Hello, world!" << std::endl; nvpdu)q<