“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。 8l.bT|#O
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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》。 G'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: \V(w=
Ada ""f'L,`{.
with Ada.Text_Io; use Ada.Text_Io; P:#KBF;a
procedure Hello is oNEjlV*
begin !qu/m B
Put_Line ("Hello, world!"); u<['9U
end Hello; ""@kBY1C
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汇编语言 {Mpx33
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x86 CPU,DOS,TASM wi/qI(O!
MODEL SMALL U-*`I?~=4
IDEAL eKUP,y;[I
STACK 100H ~tc,p
!AXt6z cZ
DATASEG b!<\#[
A4
HW DB 'Hello, world!$' drQI@sPp
.fgVzDR|+
CODESEG >~;=
j~
MOV AX, @data V8hmfV~=]P
MOV DS, AX F$j?}
MOV DX, OFFSET HW G"F)t(iX
MOV AH, 09H g-~]^ $
INT 21H aGAeRF
MOV AX, 4C00H ["_+~*
INT 21H I~ 1Rt+:
END m9=93W?
MBqw{cy
Xaw ~Hh)
x86 CPU,GNU/Linux,NASM GU|(m~,`
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). H?_wsh4J
;Enter this into "hello.asm" then type: #|"M
;"nasm -f elf hello.asm" (zX75QSKV
;"ld hello.o -o hello" *!.anbo@?z
;"./hello" gX|We}H
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section .data ;data section declaration |{ @BH
msg db 'Hello World!',0AH z*)kK
len equ $-msg ;string length N(l
$DlO<
section .text ;code section declaration Q_)$Ha{>H,
global _start ;entry point (start of execution) r>ag(^J\
_start: mov edx,len ;string length =[:pm)
mov ecx,msg ;string start iv
~<me0F
mov ebx,1 ;file handle: stdout 7O-fc1OTv
mov eax,4 ;sys_write P~*'/!@
int 80h ;kernel system call a$5P\_
@R_ON"h
mov ebx,0 ;return value OWc~=Cr
mov eax,1 ;sys_exit I}+9@d
int 80h ;kernel system call x
}@P
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x86 CPU,Windows,MASM32 F!<!)_8Q
.386 g3
opN>W
.model flat,stdcall xpp>5d
!
option casemap:none W1&"dT@
;Include 文件定义 q#O8Fv
include windows.inc 9$L2a
include user32.inc v,kvLjqt
includelib user32.lib v?YxF}
include kernel32.inc |=:<[FU
includelib kernel32.lib 9&bJ]
;数据段 C~IE_E&Q`
.data NM"5.
szCaption db 'A MessageBox!',0 YrsE
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szText db 'Hello,world!',0 >qVSepK3
;代码段 (<}BlL
.code L6"V=^Bq
start: kEp{L
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK j[A:So
invoke ExitProcess,NULL [:zP]l.|
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> &3OV|ly]
end start R;zf x/
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BEGIN { print "Hello, world!" } `nRF"T_
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BASIC Ae%AG@L
传统版BASIC(例如GWBASIC): _\gCdNrD
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10 PRINT "Hello, world!" c#f@v45
20 END x!6<7s
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或在提示符输入: c^<~Y$i
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?"Hello, world!":END p=m:^9/
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现代版BASIC(例如Quick BASIC): m8V}E&6
fB 0X9iV6j
Print "Hello, world!" $Ai zKiV
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以下的语句在Quick BASIC中同样有效: gT(8.<h8
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? "Hello,world!" yp[,WZt
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TT no
BCPL kE :{#>[Uz
GET "LIBHDR" OIIA^QyV
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LET START () BE I1#MS4;$^
$( 6FN#X g
WRITES ("Hello, world!*N") ]V)*WP#a
$) JLt%G^W>
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Befunge l"7#(a
"!dlrow olleH">v U~d%5?q
, 'Z]wh .]T
^_@ NTEN
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d tE"1nR
Brainfuck NwxDxIIH/)
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< '\GU(j
+++++++++++++++.>.+++.------.--------.>+.>. 1:r#m- \
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#include <stdio.h> :[CEHRc7x
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int main(void) f-634KuP
{ >FKwFwT4D
printf("Hello, world!\n"); 80`$F{xcX
return 0; f7 |Tp m
} "LSzF_mK
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C++ (tX)r4VU
#include <iostream> J7qTE8 W=
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int main() t-5Y,}j
{ k]^ya?O]p
std::cout << "Hello, world!" << std::endl; oh@Ha?
return 0; !.-u'6e
} N:okt)q:%
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C++/CLI @SyL1yFX
int main() 7xQ:[P!G+
{ hu1ZckIw?
System::Console::WriteLine("Hello, world!"); rL&Mq}7QK
} jEwt1S V
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C# (C Sharp) V#5$J Xp
class HelloWorldApp ky-nP8L}
{ 9e c},~(
public static void Main() =R~zD4{"
{ 2gZ nrU
System.Console.WriteLine("Hello, world!"); Mi{ns $B%
} ?3 k_YN"
} znPh7{|<