“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。 ^l(^z fsZ
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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》。 l"\uf(0K
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以下是用不同语言写成的Hello World程序的几个例子: m&/=&S
Ada P
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with Ada.Text_Io; use Ada.Text_Io; Uk'U?9O
procedure Hello is vpLMhf`
begin 1`l;xw1W
Put_Line ("Hello, world!"); D#0O[F@l##
end Hello; h<NRE0-
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汇编语言 k|B2@{
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x86 CPU,DOS,TASM 8xTix1u0
MODEL SMALL vYnftJK&
IDEAL V^rW?Do
STACK 100H :Ss3ck*=
n)RM+g
DATASEG 3U;1D2"AE
HW DB 'Hello, world!$' kUbnVF5'
CDCC1B G"
CODESEG 2f..sNz
MOV AX, @data 9XOyj5
MOV DS, AX {Hk/1KG>
MOV DX, OFFSET HW %VJW@S>j/
MOV AH, 09H sfI N)jh
INT 21H .
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MOV AX, 4C00H '9q6aM/&
INT 21H [cpNiw4e
END L|\Diap
~gdd cTp
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x86 CPU,GNU/Linux,NASM I7G,`h+H
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). xZ+]QDKC
;Enter this into "hello.asm" then type: @O/,a7Tt
;"nasm -f elf hello.asm" T|bZ9_?+2
;"ld hello.o -o hello" \_U*t!
;"./hello" &t_h'JX&
c#pj :f*H
section .data ;data section declaration (.Xr#;\(
msg db 'Hello World!',0AH t)r1"oA
len equ $-msg ;string length D^$OCj\
- 9-fX(I
section .text ;code section declaration 'C~9]Y].
global _start ;entry point (start of execution) j)L1H*
S%
_start: mov edx,len ;string length /s`;9)G]9
mov ecx,msg ;string start %g w{[
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mov ebx,1 ;file handle: stdout g^j7@dum
mov eax,4 ;sys_write Funj!x'uE
int 80h ;kernel system call j@ v-|
TQ' e
mov ebx,0 ;return value p;`N\.ld
mov eax,1 ;sys_exit RIjM(P
int 80h ;kernel system call D]u=PqHk2
/b{HG7i\
[`nY2[A$
x86 CPU,Windows,MASM32 9L"?wv
.386 ;BVDt
.model flat,stdcall } yq
option casemap:none euZI`*0
;Include 文件定义 -3vh!JMN
include windows.inc 968^ "T#
include user32.inc E em
g
includelib user32.lib $?f]ZyZr.
include kernel32.inc ";dU-\3M
includelib kernel32.lib e/94y6*>
;数据段 [z+x"9l0!
.data >EIrw$V$
szCaption db 'A MessageBox!',0 x'i0KF
szText db 'Hello,world!',0 #LWg" i
;代码段 a))*F!}c
.code B.K4!/cF
start: 3;Hd2 ;G
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 2AK}D%jfc
invoke ExitProcess,NULL 6x4_b
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> kqf8=y
end start m6MaX}&zv
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or.\)(m#(
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BEGIN { print "Hello, world!" } rzT{-DZB[4
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BASIC FL&dv
传统版BASIC(例如GWBASIC): TQ-KkH}y
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10 PRINT "Hello, world!" G_(ct5:_"!
20 END UABbcNW
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或在提示符输入: ^c'f<<z|7r
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?"Hello, world!":END -'ZxN'*%
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现代版BASIC(例如Quick BASIC): 61,O%lV
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Print "Hello, world!" ]_#SAhOR)
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以下的语句在Quick BASIC中同样有效: ^A#x<J+
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? "Hello,world!" GNZ#q)qT
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BCPL tqhh<u;
GET "LIBHDR" '!@A}&]
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LET START () BE mu>] 9ZW
$( A]xCF{*)&
WRITES ("Hello, world!*N") ^U{P3%uZ
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Befunge PW)8aLU
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C WKOI\
#include <stdio.h> c/RT0xql*
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int main(void) ^XNw$@&',
{ tNB%eb{
printf("Hello, world!\n"); b~9`]+
return 0; xD^wTtT
} D}Au6
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q#m!/wod
C++ :mn(0
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#include <iostream> pJocI_v9
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int main() F {/>u(@3
{ !G[f[u4Zg
std::cout << "Hello, world!" << std::endl; *?p
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return 0; Cy6%S).c
} wBE7Bv45
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C++/CLI Nuo^+z
E
int main() ~W3:xnBEk
{ ;/R kMS
System::Console::WriteLine("Hello, world!"); _hWuAJ9Qy
} yIWc\wv
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C# (C Sharp)
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class HelloWorldApp R)Q/Ff@o0
{ l[Tt[n
public static void Main() @wMQC\Z
{ @Jm.HST#S8
System.Console.WriteLine("Hello, world!"); {x9j_/R
} Xout:dn
} [.ey_}X8
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COBOL dDo6fP2
IDENTIFICATION DIVISION. i`R(7Z
PROGRAM-ID. HELLO-WORLD. ^K"ZJ6?+1
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ENVIRONMENT DIVISION. Ca
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