“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。 P'^#I[G'
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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》。 *],]E;
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以下是用不同语言写成的Hello World程序的几个例子: 7O3 \
Ada a78&<
with Ada.Text_Io; use Ada.Text_Io; [I*BEJ;W'
procedure Hello is .Rq|F
begin Jf<+VJ>t
Put_Line ("Hello, world!"); (A.%q1h
end Hello; <"|BuK
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汇编语言 :Oz! M&Ov
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x86 CPU,DOS,TASM #!,tId
MODEL SMALL <VB;J5Rv
IDEAL ,z6&k
STACK 100H 1b)^5U ;
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DATASEG i#$N,kt
HW DB 'Hello, world!$' vM5u]u!
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CODESEG ,U_p6TV5
MOV AX, @data !C&!Wj
MOV DS, AX Y|bCbaF
MOV DX, OFFSET HW tlo"tl_]
MOV AH, 09H ?zwPF;L*
INT 21H Q_<CG[,6D1
MOV AX, 4C00H 0)}bJ,5/
INT 21H ZU%7m_ zO
END 5Qb%g)jZ
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x86 CPU,GNU/Linux,NASM T7E9l
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ZJz6{cY
;Enter this into "hello.asm" then type: ve.rpF\
;"nasm -f elf hello.asm" )M5:aSRz
;"ld hello.o -o hello" kFPZ$8e
;"./hello" V!=1 !"}OG
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section .data ;data section declaration rSU%!E+|<
msg db 'Hello World!',0AH rf.w}B;V;
len equ $-msg ;string length HhfuHZ<
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section .text ;code section declaration ;74hOHDS
global _start ;entry point (start of execution) [eV!ho*r
_start: mov edx,len ;string length nKn,i$sO/.
mov ecx,msg ;string start '+tU8 Pb
mov ebx,1 ;file handle: stdout n dRy&[f7
mov eax,4 ;sys_write n,eO6X 4
int 80h ;kernel system call 0*?~I;.2m$
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mov ebx,0 ;return value v@bs4E46e
mov eax,1 ;sys_exit r0=Aru5n
int 80h ;kernel system call T9enyYt%
\]
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x86 CPU,Windows,MASM32 7o?6Pv%HJC
.386 fDo )~t*~
.model flat,stdcall `PI,tmv!
option casemap:none WZ}c)r*R
;Include 文件定义 "7_6iB&@<
include windows.inc
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include user32.inc M~Tq'>Fn
includelib user32.lib <'H^}gQow
include kernel32.inc |n-NK&Y(o
includelib kernel32.lib xmz83Ll9
;数据段 LO8V*H(
.data w]w>yD>$
szCaption db 'A MessageBox!',0 aagN-/mgm
szText db 'Hello,world!',0 0tVZvXgTu
;代码段 l_JPkM(mJw
.code >/;V_(
start: N_TWT&o4
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 9kj71Jp&}
invoke ExitProcess,NULL l%h0x*?$
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> v*}r<}j
end start Mfjj+P
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BEGIN { print "Hello, world!" } ajF-T=5
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BASIC T1ZAw'6(K
传统版BASIC(例如GWBASIC): b!VaEK
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10 PRINT "Hello, world!" E.kGBA;a?
20 END MH|!tkW>:
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或在提示符输入: `mV&[`NZ
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?"Hello, world!":END xcfEL_'o
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现代版BASIC(例如Quick BASIC): h%MjVuLn
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Print "Hello, world!" 3 A2X1V"
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以下的语句在Quick BASIC中同样有效: L2Ynv4llm
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? "Hello,world!" w[Ee#Yaj.-
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BCPL E/@w6uIK[
GET "LIBHDR" C5;=!B
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LET START () BE ikf6Y$nWfF
$( R%iyNK,
WRITES ("Hello, world!*N") l@vau pg
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Befunge gZ6]\l]J{
"!dlrow olleH">v uev$5jlX
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Brainfuck E,,)?^ g
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< tW;?4}JR
+++++++++++++++.>.+++.------.--------.>+.>. kxU<?0
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C MJS4^*B\1
#include <stdio.h> :X-Z|Pv8
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int main(void) +grIw#j
{ FHWzwi*u}
printf("Hello, world!\n"); T4n.C~
return 0; !$r4 lu
} a=bP
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C++ 37'@,*m`
#include <iostream> jH26-b<
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int main() &