“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。 wL]7d3t
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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》。 v*Qr(4
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以下是用不同语言写成的Hello World程序的几个例子: cGw* edgp6
Ada v%|()Z0
with Ada.Text_Io; use Ada.Text_Io; 2nOoG/6
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procedure Hello is K
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begin 0:^L>MO
Put_Line ("Hello, world!"); > m GO08X
end Hello; xN\PQ,J
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汇编语言 i)V-q9\
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x86 CPU,DOS,TASM U!sv6=(y@
MODEL SMALL :('7ly!h
IDEAL C'ZF#Z
STACK 100H !m"(SJn"
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DATASEG ,4ftQJ
HW DB 'Hello, world!$' L 6){wQ%c
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CODESEG +%%FT#ce
MOV AX, @data JHN35a+
MOV DS, AX Pm]6E[zC
MOV DX, OFFSET HW ^'DrU<o
MOV AH, 09H 24 S,w>j
INT 21H t@-:e^ v
MOV AX, 4C00H v~:$]a8
INT 21H [o)P
END J;Az0[qMR
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x86 CPU,GNU/Linux,NASM ~:."BA
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). JcxhI]E
;Enter this into "hello.asm" then type: |y@TI
;"nasm -f elf hello.asm" &$fe%1#
;"ld hello.o -o hello" F"9f6<ge
;"./hello" )J+vmY~&
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section .data ;data section declaration v7VJVLH,I7
msg db 'Hello World!',0AH Fl GKy9k
len equ $-msg ;string length vkan+~H
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section .text ;code section declaration b'fj
global _start ;entry point (start of execution) Y418k
_start: mov edx,len ;string length E)%]?/w
mov ecx,msg ;string start hM2^[8
mov ebx,1 ;file handle: stdout 'j];tO6GfC
mov eax,4 ;sys_write uQ#3;sFO
int 80h ;kernel system call !8]W"@qb
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mov ebx,0 ;return value %&9tn0B
mov eax,1 ;sys_exit HUurDgRi]
int 80h ;kernel system call ;pdW7
emb~l{K $
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x86 CPU,Windows,MASM32 $~4ZuV%
.386 s% `o
.model flat,stdcall v`B7[B4K3
option casemap:none eHG**@"X
;Include 文件定义 a
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include windows.inc J?$4Yf
include user32.inc _T^ip.o
includelib user32.lib LRD71*/
include kernel32.inc ( B$;'U<
includelib kernel32.lib pLL
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;数据段 G8"L#[~
.data X\\WQxj
szCaption db 'A MessageBox!',0 ;<%~g8:XL
szText db 'Hello,world!',0 ,WbO8#z+
;代码段 BuI&kU,WY
.code tsq]QTA*
start: ^<xpp.eY
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK \}t(g}7T
invoke ExitProcess,NULL `bO+3Y'5
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Ps0'WRJnx
end start >:5/V0;,
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BEGIN { print "Hello, world!" } YD$fN"}-
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BASIC ihKnZcI$i
传统版BASIC(例如GWBASIC):
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10 PRINT "Hello, world!" VN|P(S6
20 END "y/GK1C
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或在提示符输入: ,6,#Lc
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?"Hello, world!":END u!mUUFl
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现代版BASIC(例如Quick BASIC): /r Zj=
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Print "Hello, world!" 31k.{dnm
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以下的语句在Quick BASIC中同样有效: 9f;\fe
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? "Hello,world!" 21M@z(q*
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BCPL Ra[{K@
GET "LIBHDR" sCSrwsbhv
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LET START () BE TIlcdpwXf
$( lM"@vNgK
WRITES ("Hello, world!*N") !HM{imT
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Befunge ZffK];D
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Brainfuck 0Z8K +,'!
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#include <stdio.h> 3J~Q pw0<
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int main(void) i,M<}e1
{ !.H< dQS
printf("Hello, world!\n"); $0V<wsVM
return 0; O8TAc]B
} ^k]OQc7q'
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C++ NMM0'tY~
#include <iostream> Vq2d+
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int main() l_FttN
{ }Zc.rk
std::cout << "Hello, world!" << std::endl; +'Pf|S
return 0; R8Nr3M9 )
} _dVzvk`_R
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