“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。 R/U"]Rc
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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$lP?\P;}X
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以下是用不同语言写成的Hello World程序的几个例子: s+9q:
Ada $}N'm
with Ada.Text_Io; use Ada.Text_Io; XswEAz0=
procedure Hello is (q*Za
begin ,:j^EDCsaJ
Put_Line ("Hello, world!"); oljl&tuQy
end Hello; p<tj6O
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汇编语言 XV]`?
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x86 CPU,DOS,TASM &$|k<{j[<f
MODEL SMALL =2#
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IDEAL U5%EQc-"P
STACK 100H lhKd<Y"
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DATASEG :^%My]>T
HW DB 'Hello, world!$' 0;
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CODESEG '
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MOV AX, @data o0_RU<bWN
MOV DS, AX b>Iqk
MOV DX, OFFSET HW fo^M`a!va0
MOV AH, 09H _z#zF[%
INT 21H esWgYAc3{
MOV AX, 4C00H ySL 31%
INT 21H 7{2knm^
END +3!um
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x86 CPU,GNU/Linux,NASM /m(vIl
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). U_y)p Cd
;Enter this into "hello.asm" then type: :;#Kg_bz
;"nasm -f elf hello.asm" L00,{g6wqb
;"ld hello.o -o hello" KzG8K 6wZ
;"./hello" 8!'#B^
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section .data ;data section declaration T1LtO O
msg db 'Hello World!',0AH @I_A\ U{
len equ $-msg ;string length J#!:Z8b
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section .text ;code section declaration P
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global _start ;entry point (start of execution) `[2nxP>w`
_start: mov edx,len ;string length H'P1EZtq
mov ecx,msg ;string start TY],H=
mov ebx,1 ;file handle: stdout D9 OS,U/l
mov eax,4 ;sys_write H_3S#.
int 80h ;kernel system call [j`It4^nC
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mov ebx,0 ;return value ~ucOQVmz@
mov eax,1 ;sys_exit ?TLMoqmXM{
int 80h ;kernel system call dyC: Mko=
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x86 CPU,Windows,MASM32 dc|"34;^"
.386 T4F}MVK
.model flat,stdcall { %vX/Ek
option casemap:none ;lB%N
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;Include 文件定义 t:9}~%~
include windows.inc g~S>_~WL
include user32.inc pJ ;J>7Gt
includelib user32.lib 5rr7lwWZ
include kernel32.inc != _:*U)-'
includelib kernel32.lib x}?y@.sn8
;数据段 cO.U*UTmX
.data ~
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szCaption db 'A MessageBox!',0 Ola>] 0l
szText db 'Hello,world!',0 :MV]OLRM
;代码段 W7c(]
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.code hCD0Zel
start: hHm&u^xY
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK {Nuwz|Ci
invoke ExitProcess,NULL U"v(9m@
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> No=Ig-It
end start G^ZL,{
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BEGIN { print "Hello, world!" } y{0`+/\`
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BASIC
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传统版BASIC(例如GWBASIC): bc}U &X<
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10 PRINT "Hello, world!" vQ#$.*Cvn
20 END G|Yw
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或在提示符输入: H[wJ; l
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?"Hello, world!":END :bkACuaEn
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现代版BASIC(例如Quick BASIC): FVW<F(g`
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Print "Hello, world!" 9OuK}Ssf
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以下的语句在Quick BASIC中同样有效: y\$B9KX
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? "Hello,world!" N)K};yMf
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BCPL E3<jH
GET "LIBHDR" ,B(UkPGT
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LET START () BE };o6|e:2E
$( *]nha1!S
WRITES ("Hello, world!*N") 7L|w~l7R~
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Befunge OkGg4X|9
"!dlrow olleH">v 8 k9(iS
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Brainfuck ?7 e|gpQ|
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+++++++++++++++.>.+++.------.--------.>+.>. uc<XdFcu
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C Tw/kD)u{
#include <stdio.h> FY)v rM*yh
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int main(void) 1_%jDMYH
{ .;ml[DXH
printf("Hello, world!\n"); "aHY]E{
return 0; nud,ag
} PwU}<Hrl]
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C++ &F1h3q)L
#include <iostream> 8W)3rD>
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int main() ~
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{ _6Wz1.]n
std::cout << "Hello, world!" << std::endl; VQ5T$,&
return 0; v|t_kNX;v*
} ge)g ?IP4
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C++/CLI lBqu}88q0
int main() \~UyfVPRT
{ Ck8`$x&t
System::Console::WriteLine("Hello, world!"); ^crk8O@Fw
} H$zjN8||"
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C# (C Sharp) E#JDbV1AC
class HelloWorldApp 1fM=>Z
{ E@^`B9;Q7
public static void Main() o\vIYQ
{ U~-Z`_@^-
System.Console.WriteLine("Hello, world!"); rQg7r>%Q
} <&\HXAOd
} .\M@oF
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COBOL m663%b(5>
IDENTIFICATION DIVISION. u`dWU}m)
PROGRAM-ID. HELLO-WORLD. {LYA?w^GT
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ENVIRONMENT DIVISION. 7GY[l3arxv
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DATA DIVISION. A<2_V1
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PROCEDURE DIVISION. !yU!ta Q
DISPLAY "Hello, world!". XKN`{h-@
STOP RUN. 6pDb5@QjTy
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Common Lisp &?YbAo_K
(format t "Hello world!~%") _?#}@?
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