“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。 jMK3T
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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》。 'b8R#R\P
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以下是用不同语言写成的Hello World程序的几个例子: 6dF$?I&
Ada Oc7 >S.1
with Ada.Text_Io; use Ada.Text_Io; 3"5.eZSOW
procedure Hello is a*V9_Px$&
begin g<fP:/
Put_Line ("Hello, world!"); Uf# PoQ!y
end Hello; 'KSa8;:=C
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汇编语言 Q`N18I3
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x86 CPU,DOS,TASM O'fk&&l
MODEL SMALL TW>?h=.z
IDEAL .\$Wy$ d
STACK 100H mj)PLZ]
L*P_vCC
DATASEG H \ 3M
HW DB 'Hello, world!$' _HwpPRVP/
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CODESEG ,NDh@VYe
MOV AX, @data :#WEx_]
MOV DS, AX 5!~!j
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MOV DX, OFFSET HW S0F@#mSQ?
MOV AH, 09H 6{Ks`Af
INT 21H 9x(}F<L
MOV AX, 4C00H m`'=)x|
INT 21H |B
eA==
END d^tVD`Fm
C(s\LI!r
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x86 CPU,GNU/Linux,NASM l1}R2lSEO
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). jA,|JgN|n
;Enter this into "hello.asm" then type: )i @1XH"D
;"nasm -f elf hello.asm" L.kD,'G}>
;"ld hello.o -o hello" yOc|*O=]U
;"./hello" 9/G!0uE
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section .data ;data section declaration A]j}'
msg db 'Hello World!',0AH zHV|-R
len equ $-msg ;string length L%f;J/
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section .text ;code section declaration IdF$Ml#[h
global _start ;entry point (start of execution) !Vb,zQ
_start: mov edx,len ;string length C,.-Q"juH
mov ecx,msg ;string start ms7SoYbSu
mov ebx,1 ;file handle: stdout IQIbz{bMx
mov eax,4 ;sys_write $Buf#8)F*
int 80h ;kernel system call )i0 $j)R
U,HIB^=
R
mov ebx,0 ;return value lj*8mS/;h
mov eax,1 ;sys_exit X($6IL6m
int 80h ;kernel system call }%+qP+O\
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x86 CPU,Windows,MASM32 [%jxf\9jJ_
.386 FOSbe]
.model flat,stdcall )
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option casemap:none k Q~ %=pn
;Include 文件定义 |#V(p^
include windows.inc ge$LIsE8
include user32.inc -?5$ PH
includelib user32.lib Q<yAT(w
include kernel32.inc ".E5t@ }?m
includelib kernel32.lib ywEDy|Wn$~
;数据段 QF.3c6O@
.data ;b1wk^,Hw~
szCaption db 'A MessageBox!',0 gH'_ymT=
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szText db 'Hello,world!',0 { V0>iN:~S
;代码段 6|^0_6_
.code %9X{{_
start: n$YE !D'
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 2m\m/O
invoke ExitProcess,NULL "<x&pQZ%
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> gQ>2!Qc a-
end start Af9+HI
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AWK uB;_vC
BEGIN { print "Hello, world!" } /[iG5~G
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BASIC t:=k)B
传统版BASIC(例如GWBASIC): H_Os4}
sP y2/7Wqd
10 PRINT "Hello, world!" xs%LRF#u
20 END b=1%pX_
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或在提示符输入: qg4fR' i
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?"Hello, world!":END U(~U!O}
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现代版BASIC(例如Quick BASIC): -`Q}tg>cT
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Print "Hello, world!" Vho0eV=
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以下的语句在Quick BASIC中同样有效: %2D17*eK
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? "Hello,world!" 4P%m>[
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BCPL *,lh:
GET "LIBHDR" DjwQ`MA
)o jDRJ&
LET START () BE hwVAXsF~
$( h!e2
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WRITES ("Hello, world!*N") J &{xP8uq_
$) *d>vR1
eh<rRx"[
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Befunge Go <'
"!dlrow olleH">v V7C1FV2
, v"RiPHLT
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qVBL>9O*.
Brainfuck *Hs*,}MS
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< eg3L:rk_
+++++++++++++++.>.+++.------.--------.>+.>. 3wC
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C xmr|'}Pt[
#include <stdio.h> p)3nyN=|_
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int main(void) ?2ItB `<(
{ ArzDI{1
printf("Hello, world!\n"); @B`Md3$7
return 0; P^[/Qi}j
} tg 85:
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C++ mW4%2fD[
#include <iostream> z(H?VfJo
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int main() =yqHC<8:
{ ;S JF%@x
std::cout << "Hello, world!" << std::endl; vZkXt!%)
return 0; |nY~ZVTt/
} &U"X$aFc
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>]&X ^V%Q#
C++/CLI V=}1[^
int main() ~R.dPUr
{ eko]H!Ov(
System::Console::WriteLine("Hello, world!"); `#6x=24
} |RhM| i
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C# (C Sharp) IU!Ht>
class HelloWorldApp M"U OgS
{ 6>DLp}d
public static void Main() Qhy#r
{ rLF*DB3l
System.Console.WriteLine("Hello, world!"); =;{^"#r\
} r{[OJc!
} /P+q}L%
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COBOL (C S8(C4[
IDENTIFICATION DIVISION. X:=c5*0e
PROGRAM-ID. HELLO-WORLD. 2o5;Uz1{
6 h'&6
ENVIRONMENT DIVISION. ;7rv
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DATA DIVISION. @`|)Ia<
Q2s&L]L=
PROCEDURE DIVISION. Hwu4:^OL|
DISPLAY "Hello, world!". @-"R$HOT
STOP RUN. 9y~"|t
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Common Lisp !>g:Si"
(format t "Hello world!~%") ,X/-
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