“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。 p1^k4G
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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》。 ^0"W/
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以下是用不同语言写成的Hello World程序的几个例子: 6XU1w
Ada 8JYF0r7
with Ada.Text_Io; use Ada.Text_Io; n
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procedure Hello is ,
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begin *htv:Sr
Put_Line ("Hello, world!"); ,|RS]I>X
end Hello; )y8 u+5^
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汇编语言 w#ha ^4
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x86 CPU,DOS,TASM i4"BN,NZ{
MODEL SMALL xB.h#x>_`
IDEAL rO#WG}E<"
STACK 100H ="X2AuK%1$
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DATASEG +"8AmN4
HW DB 'Hello, world!$' w'uI~t4
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CODESEG GI:J9TS
MOV AX, @data dS9L( &
MOV DS, AX B5FRe'UC
MOV DX, OFFSET HW `+Ko{rf+9
MOV AH, 09H M3>c?,O)J
INT 21H ~ti{na4W<
MOV AX, 4C00H JQSp2b@'H
INT 21H )L^GGy8w
END |#uA(V
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x86 CPU,GNU/Linux,NASM 1$1s0yg
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). $A>\I3B
;Enter this into "hello.asm" then type: 7Q_AZR4
;"nasm -f elf hello.asm" +
Xc s<+b
;"ld hello.o -o hello" VG,O+I'^z
;"./hello" %OS}BAh^i
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section .data ;data section declaration 7-p9IFcA
msg db 'Hello World!',0AH HP`dfo~j
len equ $-msg ;string length kl(id8r
btb$C
section .text ;code section declaration qyA%_;ReMY
global _start ;entry point (start of execution) _T[7N|'O
_start: mov edx,len ;string length a g=,oYn
mov ecx,msg ;string start 0[ (Z48
mov ebx,1 ;file handle: stdout LI`L!6^l
mov eax,4 ;sys_write x}acxu 2H7
int 80h ;kernel system call }ZPO^4H;-
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mov ebx,0 ;return value >b6!*Lrhs
mov eax,1 ;sys_exit T~=r*4
int 80h ;kernel system call "YW&,X5R
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x86 CPU,Windows,MASM32 P;B<R"
.386 J`uO~W"
.model flat,stdcall sR(or=ub~
option casemap:none 6I5,PB
;Include 文件定义 H83Gx;
include windows.inc f=$w,^)M
include user32.inc v$H=~m
includelib user32.lib l'Oz-p.@
include kernel32.inc 2.xA' \M
includelib kernel32.lib nu'r`
;数据段 R8Kj3wp
.data e|6kgj3/
szCaption db 'A MessageBox!',0 :[hZn/
szText db 'Hello,world!',0 e7T}*Up
;代码段 +`y{r^xD
.code {xW HKsI>,
start: `,-w+3?Al
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK BYhF?
invoke ExitProcess,NULL uv&??F]/
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> D's Tv}P
end start I-L52%E]
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AWK A>C&`A=-
BEGIN { print "Hello, world!" } _zuaImJ0o
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BASIC p,(gv])ie
传统版BASIC(例如GWBASIC): Nft~UggK
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10 PRINT "Hello, world!" !c 3c%=W
20 END !xqy6%p
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或在提示符输入: E ISgc {s
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?"Hello, world!":END *9XKkR<r
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现代版BASIC(例如Quick BASIC): o#p{0y
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Print "Hello, world!" #o>~@.S#:0
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以下的语句在Quick BASIC中同样有效: yniXb2iM
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? "Hello,world!" c >8IM
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BCPL nM=5L:d
GET "LIBHDR" d*}dM"
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LET START () BE x6h';W_ 8
$( @pV~Q2%
WRITES ("Hello, world!*N") u!]g^r
$) vZ&{
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Befunge ?j'Nx_RoX
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#include <stdio.h> k}0Y&cT!rU
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h
int main(void) /s/\5-U7q
{ zUQn*Cio e
printf("Hello, world!\n"); kWSei3
return 0; o0Z~9iF&
} ep ,"@,,
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C++ $;J:kd;<
#include <iostream> }ldOxJSB?
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int main() 5s7C;+
{ '5usPD
std::cout << "Hello, world!" << std::endl; ]Yw/}GKB
return 0; G`D~OI
} [ Q@rW5,-
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C++/CLI G/)]aGr
int main() )<~v~|re
{ \]Nt-3|`0
System::Console::WriteLine("Hello, world!"); E! s?amM4
} f"Z2,!Z;
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C# (C Sharp) `[(.Q
class HelloWorldApp .='hYe.
{ 17C"@1n-
public static void Main() ;_nV*G.y#^
{ o8ERU($/
System.Console.WriteLine("Hello, world!"); L>ruNw'-K
} _u]S/X-
} <@](uWu
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COBOL 4b@Awtk
IDENTIFICATION DIVISION. O: J;zv\
PROGRAM-ID. HELLO-WORLD. 'CfM'f3uu
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ENVIRONMENT DIVISION. Py!
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DATA DIVISION. N
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PROCEDURE DIVISION.
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DISPLAY "Hello, world!". 8Buus
STOP RUN. `,7;2ZG~O
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