“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。 $?Km3N\?v
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 3<XP/c";
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以下是用不同语言写成的Hello World程序的几个例子: vRhI:E)So#
Ada eoj(zY3
with Ada.Text_Io; use Ada.Text_Io; D6I-:{ws
procedure Hello is m| uVmg!*
begin HfOaJ'+e<
Put_Line ("Hello, world!"); YD9|2S!G
end Hello; 7v']wA r]
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汇编语言 _^Z
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x86 CPU,DOS,TASM xe4`D>LUo
MODEL SMALL 9^?2{aP%
IDEAL ZGw6Bd_I
STACK 100H ,Gi%D3lA
\? n<UsI
DATASEG u5.zckV
HW DB 'Hello, world!$' )H1\4LeP
$RA+StF!]
CODESEG SpO%nZ";g8
MOV AX, @data h
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MOV DS, AX Gh5 3Pne
MOV DX, OFFSET HW 1Y:JGon
MOV AH, 09H x' v-]C(@
INT 21H r9Vt}]$a G
MOV AX, 4C00H [-0=ZKH?
INT 21H +Pc2`,pw|
END ,. HS )<B
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x86 CPU,GNU/Linux,NASM cd&sAK"
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). @ N@
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;Enter this into "hello.asm" then type: V8O-|7H$v
;"nasm -f elf hello.asm" Eo`'6
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;"ld hello.o -o hello" Bh UGMK
;"./hello" 5yL\@7u`
g [u*`]-;v
section .data ;data section declaration :bq${
msg db 'Hello World!',0AH *L&|4|BF2
len equ $-msg ;string length r,<p#4(>_
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section .text ;code section declaration bXz*g`=;
global _start ;entry point (start of execution) <CcSChCg
_start: mov edx,len ;string length hRQw]
mov ecx,msg ;string start $ghlrV;:ct
mov ebx,1 ;file handle: stdout en"\2+{Cg
mov eax,4 ;sys_write }U^iVq*
int 80h ;kernel system call Xf;_r+;
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mov ebx,0 ;return value jA? 7>"|
mov eax,1 ;sys_exit vX?C9Fr 2
int 80h ;kernel system call d"=)=hm!
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x86 CPU,Windows,MASM32 lMmP]{.>$
.386 7/HX!y{WP
.model flat,stdcall 2c'<rkA
option casemap:none *&z!y/
;Include 文件定义 RGLJaEl !
include windows.inc 7sU+:a
include user32.inc qL?$u07<9'
includelib user32.lib FMtg7+Q|>
include kernel32.inc C1uV7t*\
includelib kernel32.lib t=\
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;数据段 -bgj<4R$p
.data G '%ZPh89
szCaption db 'A MessageBox!',0 uf1s}/M
szText db 'Hello,world!',0 x9o(q`N
;代码段 t~|`RMn"
.code ?@^gpVK{
start: "H9q%S,FH
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 6"9(ce
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invoke ExitProcess,NULL K}DrJ/s
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> \8)FVpS
end start .)E1|U[L
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BEGIN { print "Hello, world!" } !TN)6e7`
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BASIC ,b<m],p
传统版BASIC(例如GWBASIC): mYqLqezAA
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10 PRINT "Hello, world!" .IsOU
20 END U1D;O}z~
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或在提示符输入: v=daafO
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?"Hello, world!":END ?jsgBol
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现代版BASIC(例如Quick BASIC): PB) vE
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Print "Hello, world!" ^SbxClUfw!
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以下的语句在Quick BASIC中同样有效: ;3iWV"&_A
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? "Hello,world!" 4WPco"xH!
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BCPL S
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GET "LIBHDR" TCK#bJ
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LET START () BE zj$Ve
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WRITES ("Hello, world!*N") ~lbm^S}-
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Befunge Pk6_ 1LV
"!dlrow olleH">v Q6p75$SVq
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C g(R!M0hdF
#include <stdio.h> 'X~CrgQl
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int main(void)
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r;
{ ;+n25_9
printf("Hello, world!\n"); g@m__
return 0; @2eH;?uO
} /S9n!H:MT
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C++ ?SX0e(+}}
#include <iostream> 1]aya(
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int main() AQPzId*z
{ 6-\C?w
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std::cout << "Hello, world!" << std::endl; N::.o+1
return 0; UdFYG^i
} p]6/1&t