“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。 c6VyF=2q
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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: mi
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以下是用不同语言写成的Hello World程序的几个例子: dEZlJo@J
Ada XmN8S_M>v
with Ada.Text_Io; use Ada.Text_Io; ;KT5qiqYH
procedure Hello is wv^n#
begin ~,.;2K73
Put_Line ("Hello, world!"); #g<6ISuf
end Hello; k&17 (Tv$
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汇编语言 4u#TKr.
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x86 CPU,DOS,TASM @I#uv|=N
MODEL SMALL P+DIo7VTX
IDEAL 6 !wk5#
STACK 100H o_03Io
~Bf
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DATASEG wYQEm
HW DB 'Hello, world!$' Pk;YM}
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CODESEG `i<Z<
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MOV AX, @data zpZfsn!
MOV DS, AX PJ^qE|X
MOV DX, OFFSET HW IRTD(7"oyp
MOV AH, 09H ygQe'S{!S\
INT 21H pj7v{H +
MOV AX, 4C00H .aR9ulS
INT 21H z7TyS.z
END 6w[EJ;=p_
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x86 CPU,GNU/Linux,NASM A#Y:VavQ?
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). OsKtxtLO
;Enter this into "hello.asm" then type: [pInF
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;"nasm -f elf hello.asm" %*#+(A"V
;"ld hello.o -o hello" `@#rAW D
;"./hello" ABcB-V4
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section .data ;data section declaration ',/2J0_
msg db 'Hello World!',0AH 2OQ\ z;s
len equ $-msg ;string length |#'n VN.;
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section .text ;code section declaration }Eh &'
global _start ;entry point (start of execution) O&,8X-Ix
_start: mov edx,len ;string length JfmYr47Pv
mov ecx,msg ;string start Udq!YXE0
mov ebx,1 ;file handle: stdout \>X!n2rLZe
mov eax,4 ;sys_write Sb(OG 6
int 80h ;kernel system call h}kJ,n
-gUp/#l1
mov ebx,0 ;return value <~uzKs0
mov eax,1 ;sys_exit ILqBa:J
int 80h ;kernel system call (>NZYPw^3
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x86 CPU,Windows,MASM32 Je}0KW3G9L
.386 @_1cY#!
.model flat,stdcall m.<u!MI
option casemap:none Qxk & J
;Include 文件定义 'u~0rMe4})
include windows.inc @0d"^
include user32.inc :Qhrh(i
includelib user32.lib b'Km-'MtH
include kernel32.inc XK})?LTD
includelib kernel32.lib Keem\/
;数据段 ZJ.an%4
.data IdK<:)Q
szCaption db 'A MessageBox!',0 n2EPx(~
szText db 'Hello,world!',0 Hq!|r8@6
;代码段 eTuKu(0
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.code [FLR&=.(
start: jFUpf.v2
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK MpBdke$
invoke ExitProcess,NULL FRQ0t!b<M1
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> K6sXw[VC[
end start ZvMU3])u
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BEGIN { print "Hello, world!" } PjH'5Y
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BASIC uxB`
传统版BASIC(例如GWBASIC): M X8|;t
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10 PRINT "Hello, world!" *@H\J e`
20 END gKQV99
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或在提示符输入: eLnS1w2
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?"Hello, world!":END qR_>41JU"
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现代版BASIC(例如Quick BASIC): bwH[rT!n
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Print "Hello, world!" p4*L}Q
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以下的语句在Quick BASIC中同样有效: Jv+w{"&
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? "Hello,world!" &K{8-
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BCPL N9-7YQ`D
GET "LIBHDR" oLh ,F"nB
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LET START () BE ;o9ixmT<-o
$( \~"Ub"~I
WRITES ("Hello, world!*N") }\Rmwm-
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Befunge *=.~PR6W{
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C 6]Is"3ca
#include <stdio.h> ^n(FO,8c
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int main(void) nqm=snh
{ PPr Pj^%z=
printf("Hello, world!\n"); M{{kO@P"9
return 0; Z)M
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} _eOC,J<-~
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C++ xdgAu
#include <iostream> <Q\KS
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int main() 4,z|hY_*t
{ VMRfDaO9
std::cout << "Hello, world!" << std::endl; !>n!Q*\(Ov
return 0; b4i=%]v8
} XPO-u]<