“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。 e,={!P"f
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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》。 5znLpBX<N
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以下是用不同语言写成的Hello World程序的几个例子: n <6}
Ada $7a|
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with Ada.Text_Io; use Ada.Text_Io; ::g"dRS<v
procedure Hello is `~WxMY0M
begin 8Z4d<DIJ
Put_Line ("Hello, world!"); 8JAA?0L"'
end Hello; $^.LZ1Jd
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汇编语言 /wK5YN.em
C?#if;c
x86 CPU,DOS,TASM 30*^ERO
MODEL SMALL _b<Fz`V
IDEAL $JypVA(CX
STACK 100H p^&' C_?
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DATASEG f-y4V}
HW DB 'Hello, world!$' 5@tpJ8E8$
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CODESEG F
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MOV AX, @data +uM1#-+h
MOV DS, AX o{4ya jt
MOV DX, OFFSET HW q]0a8[]3
MOV AH, 09H ';+;
INT 21H 82&JYx
MOV AX, 4C00H V5i_\A
INT 21H D7X-|`kH
END #StD]d
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x86 CPU,GNU/Linux,NASM *;7&
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). r62x*?/
;Enter this into "hello.asm" then type: gd_w;{WP
;"nasm -f elf hello.asm" NZe3
m
;"ld hello.o -o hello" xB68RQe)
;"./hello" /_rQ>PgSZW
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section .data ;data section declaration i92{N$*x
msg db 'Hello World!',0AH &jl'1mZ
len equ $-msg ;string length :@wO'
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section .text ;code section declaration l#7,<@)
global _start ;entry point (start of execution) V-}d-Y
_start: mov edx,len ;string length pco~Z{n
mov ecx,msg ;string start Xl#vVyO
mov ebx,1 ;file handle: stdout [zm&}$nnN
mov eax,4 ;sys_write %/oOM\}++
int 80h ;kernel system call t^ Aios~F
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mov ebx,0 ;return value />Wh
mov eax,1 ;sys_exit W([)b[-*
int 80h ;kernel system call 0'TqW9P
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x86 CPU,Windows,MASM32 ,yWTkql
.386 ?6p6OB
.model flat,stdcall v>c[wg9P
option casemap:none jm =E_86_
;Include 文件定义 Oe'Nn250
include windows.inc c#OZ=`
include user32.inc 0Q;T
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includelib user32.lib )*G3q/l1u6
include kernel32.inc ~B:Lai4"
includelib kernel32.lib DvG. G+mo#
;数据段 req=w;E:
.data ?f1%)]>
szCaption db 'A MessageBox!',0 YdV5\!
szText db 'Hello,world!',0 j^1T3 +
;代码段 tRS^|??
.code Ve2z= 6(
start: ,YSQog
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK k1L GT&
invoke ExitProcess,NULL }Tu_?b`RUm
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> nqBZp N^
end start bFVz ;
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BEGIN { print "Hello, world!" } UX41/# 4
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BASIC 394u']M
传统版BASIC(例如GWBASIC): Z"lL=0rY/
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10 PRINT "Hello, world!" ?fXg_?+{'g
20 END .!U `,)I
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或在提示符输入: =P'=P0G
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?"Hello, world!":END !__f
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现代版BASIC(例如Quick BASIC): 3HO4h\mp
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Print "Hello, world!" K^J;iu 4
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以下的语句在Quick BASIC中同样有效: j*I0]!-
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? "Hello,world!" ]g IXG`
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GET "LIBHDR" RL~\/#
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LET START () BE L
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$( |O+R%'z'<
WRITES ("Hello, world!*N") "3Dvc7V
$) VDPqI+z
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Befunge 8<^[xe
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#include <stdio.h> YxS*im[%]
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int main(void) 0w< iz;30
{ xO/44D
printf("Hello, world!\n"); 5iG|C ~
return 0; 0K 7-i+\#
} h6)hZ'zV
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C++ `WWf?g
#include <iostream> aZ5qq+1x
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int main() 4d!&.Qo9
{ _=UXNr8S
std::cout << "Hello, world!" << std::endl; A
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return 0; |g8
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} tI.(+-q
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C++/CLI U!3nn#!yE
int main()
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{ /PPk
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System::Console::WriteLine("Hello, world!"); ai#EFo+#
} d`({z]W;
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C# (C Sharp) dH?pQ
class HelloWorldApp j|lg&kN
{ MAJvjgd..
public static void Main() 1 68U-<
{ q69a-5q
System.Console.WriteLine("Hello, world!"); .?AtW:<*I
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} pC5-,Z;8
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COBOL %}'sFum`
IDENTIFICATION DIVISION. o<V-gS
PROGRAM-ID. HELLO-WORLD. _QXo4z!a8
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ENVIRONMENT DIVISION. jVfC 4M7 ,
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DATA DIVISION. uA}asm
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PROCEDURE DIVISION. "_H&