“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。 i{
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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》。 ~g~z"!K
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以下是用不同语言写成的Hello World程序的几个例子: DpoRR`
Ada C/tn0
with Ada.Text_Io; use Ada.Text_Io; -D`*$rp,
procedure Hello is TBvv(_
begin hA/K>Z
Put_Line ("Hello, world!"); sGc4^Z%l?
end Hello; _Z@- q
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汇编语言 1j9 .Q;9
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x86 CPU,DOS,TASM Ik(TII_
MODEL SMALL X+
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IDEAL km4::'(6
STACK 100H f'TdYG
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DATASEG 7.hn@_
HW DB 'Hello, world!$' zgJ%Zr!~
ccZ A
CODESEG t%/Y^N;
MOV AX, @data Y*dzoN.sW
MOV DS, AX v](7c2;
MOV DX, OFFSET HW d {T3
MOV AH, 09H ;sS N
INT 21H PGOi#x
MOV AX, 4C00H Kisd.~u8j
INT 21H I.euuzBgA
END Wu,'S;>C
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x86 CPU,GNU/Linux,NASM K#}DXq
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). BOoLs(p
;Enter this into "hello.asm" then type: $7T3wv9
;"nasm -f elf hello.asm" BI3Q~ADV
;"ld hello.o -o hello" MrXhVZ"d*
;"./hello" )?:V5UO\
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section .data ;data section declaration (B}+uI{
msg db 'Hello World!',0AH |l
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len equ $-msg ;string length Q+U}
d@8=%x:
section .text ;code section declaration e3yBB*@
global _start ;entry point (start of execution) kz@@/DD/9
_start: mov edx,len ;string length o2He}t2o
mov ecx,msg ;string start EX~ U(JB6
mov ebx,1 ;file handle: stdout q1;}~}W;z4
mov eax,4 ;sys_write I?.$
int 80h ;kernel system call 7xb z)FI
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mov ebx,0 ;return value A<C`JN}
mov eax,1 ;sys_exit a<B[~J 4i
int 80h ;kernel system call X@*$3z#Z
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x86 CPU,Windows,MASM32 .:B]
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.386 pE[ul
.model flat,stdcall c6:"5};_
option casemap:none 35%'HFt_
;Include 文件定义 *Sm$FMWQ
include windows.inc FYFP6ti
include user32.inc \H!ECTI
includelib user32.lib Bmm#5X@*
include kernel32.inc >%h_ R:
includelib kernel32.lib ]s?BwLU6
;数据段 H-K,Q%;C@
.data ;H9d.D8
szCaption db 'A MessageBox!',0 ]j(2FM)#
szText db 'Hello,world!',0 BSY2\AL p
;代码段 Yc/Nz(m
.code ^,]'Ut
start: }nvHE o
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK j{?,nJdQ
invoke ExitProcess,NULL 2$.
u bA
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> (30{:o&^
end start ;;pxI5
TL ;2,@H`
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AWK [cv7s=U%
BEGIN { print "Hello, world!" } (%ra~s?
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BASIC g4cmYg3
传统版BASIC(例如GWBASIC): *z!!zRh3x
4\H:^U&
10 PRINT "Hello, world!" 2-Y%W(bEzs
20 END //2G5F ;
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或在提示符输入: 3@kiUbq7Eu
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?"Hello, world!":END 6q RZ#MC
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现代版BASIC(例如Quick BASIC): X2hV)8Sk
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Print "Hello, world!" ?vuM'UH-
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以下的语句在Quick BASIC中同样有效: n8DWA`[ib
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? "Hello,world!" ]X?~Cz/wl
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OM*N) *
BCPL 2cY7sE068
GET "LIBHDR" TK<~(Dk
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LET START () BE <cW$
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$( $m] ~d6
WRITES ("Hello, world!*N") n*(Vf'k
$) cVv+,l4V0
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Befunge .%j(!
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Brainfuck HUiW#x%;
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< <GC<uB |p
+++++++++++++++.>.+++.------.--------.>+.>. OiH
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C ^UHt1[
#include <stdio.h> *9M 5'
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int main(void) mE^mQ [Dk
{ KoZ" yD
printf("Hello, world!\n"); h<U<KO
return 0; Q]9H9?}N?
} fz#e4+oH
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C++ ES p)%
#include <iostream> ~n9BN'@x
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int main() [ R1S+i
{ -fIX6
std::cout << "Hello, world!" << std::endl; t"k6wv;Tq
return 0; Fn.wd`'0
} E,&BP$B
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C++/CLI Y+75}]B
int main() DP **pf%j
{ YzJ\< tkp
System::Console::WriteLine("Hello, world!"); _Bm/v^(
} N+%E=D>
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C# (C Sharp) E:/G!1
class HelloWorldApp :bFCnV`Q
{ 3qU#Rg
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public static void Main() q'~?azg:
{ H~UxVQLPp
System.Console.WriteLine("Hello, world!"); ]4wyuP,up
} >F+Mu-^
} ?JO x9;`
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COBOL ( P|Ph
IDENTIFICATION DIVISION. 9,wd,,ta
PROGRAM-ID. HELLO-WORLD. n*~=O '
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ENVIRONMENT DIVISION. ,DsqKXSU
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DATA DIVISION. +>mbBu!7
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PROCEDURE DIVISION. ]Tk3@jw+b
DISPLAY "Hello, world!". 7WK^eW"y8
STOP RUN.
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