“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。 3)~z~p7
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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》。 z]Mu8
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以下是用不同语言写成的Hello World程序的几个例子: `SESj)W(y
Ada 6:Zd,N=
with Ada.Text_Io; use Ada.Text_Io; l$!g#?w
procedure Hello is wArtg'=X
begin [/eRc
Put_Line ("Hello, world!"); 'miY"L:| O
end Hello; |Z{
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汇编语言 n@| &jh
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x86 CPU,DOS,TASM i<uk}
MODEL SMALL P*8DM3':
IDEAL )@.6u9 \
STACK 100H UYOR@x #
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DATASEG <nT).S>+
HW DB 'Hello, world!$' x5nw/''[2
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CODESEG 1ml{oqNj
MOV AX, @data Z<Ke/Xi
MOV DS, AX }^3ICwzm
MOV DX, OFFSET HW MF~Tr0tOC
MOV AH, 09H ]bb`6 \h
INT 21H Ft$tL;
MOV AX, 4C00H ;Quk%6;[N
INT 21H CXiSin
END tcS7 @^'
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x86 CPU,GNU/Linux,NASM O'<cEv'B*
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). 3eS
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;Enter this into "hello.asm" then type: l?LP:;S
;"nasm -f elf hello.asm" D^JuL6U
;"ld hello.o -o hello" sa>}wz<o
;"./hello" ZA/:\6gm
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section .data ;data section declaration JRl`evTS
msg db 'Hello World!',0AH lCMU{)
len equ $-msg ;string length q`DilZ]S
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section .text ;code section declaration s+yX82Y
global _start ;entry point (start of execution) } h0
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_start: mov edx,len ;string length O
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mov ecx,msg ;string start 7|eD}=jy
mov ebx,1 ;file handle: stdout 1k! xG$g0
mov eax,4 ;sys_write _;].
int 80h ;kernel system call ^qlfdf
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mov ebx,0 ;return value j?rq%rQd
mov eax,1 ;sys_exit ~%o?J"y
int 80h ;kernel system call $Sfx0?'
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h q&2o
x86 CPU,Windows,MASM32 hJ1: #%Qe.
.386 XN1\!CM8
.model flat,stdcall .TTXg,8#D
option casemap:none @`6db
;Include 文件定义 }vLK-Vv
include windows.inc #=B~}
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include user32.inc j4G?=oDb
includelib user32.lib ,5L[M&5
include kernel32.inc qhiO( !jK
includelib kernel32.lib OAiip,
;数据段 g0BJj=
.data )cX6o[oia
szCaption db 'A MessageBox!',0 X3j<HQcK
szText db 'Hello,world!',0 j3`"9bY
;代码段 !(EJ. |LH
.code #YMU}4=:
start: N6BFs(
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK u.s-/ g
invoke ExitProcess,NULL _,JdL'[d
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end start .(8sa8{N
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BEGIN { print "Hello, world!" } Iq-+X3i
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BASIC 'y?(s+
传统版BASIC(例如GWBASIC): 'v"{frh
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10 PRINT "Hello, world!" Ox` +Z0)a
20 END ? }2]G'7?
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或在提示符输入: u-a* fT
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?"Hello, world!":END T*%Q s&x;
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现代版BASIC(例如Quick BASIC): '}D$"2I*
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Print "Hello, world!" rU/V~;#%
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以下的语句在Quick BASIC中同样有效: l 6;}nG
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? "Hello,world!" Z~VSWrw3
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GET "LIBHDR" dX0"h5v1
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LET START () BE :-=,([TJ
$( vElVw.
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WRITES ("Hello, world!*N") zd+_
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$) ;MqH)M
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Befunge J0e~s
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#include <stdio.h> )|88wa(M
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int main(void) `JGV3nN
{ 2\xv Yf-
printf("Hello, world!\n"); 3%<Uq%pJ
return 0; L,&R0gxi
} H*DWDJxmV
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C++ F
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#include <iostream> H1(Zzn1
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int main() AZ7
{ Nj2f?',;U
std::cout << "Hello, world!" << std::endl; o5(p&:1M
return 0; 8:%=@p>$
} ^rI<