“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。 K^z-G=|N
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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》。 FkJa+ZA
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以下是用不同语言写成的Hello World程序的几个例子: #k? Rl
Ada /E>z8J$
with Ada.Text_Io; use Ada.Text_Io; ,Nl]rmI
procedure Hello is aIaydu+ \
begin ,])@?TJb@
Put_Line ("Hello, world!"); J]uYXsC
end Hello; 9D74/3b*
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汇编语言 9HMW!DSK`
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x86 CPU,DOS,TASM lS P{9L6
MODEL SMALL x h[4d
IDEAL i(.c<e{v~
STACK 100H YbZ<=ZzO4
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DATASEG EN@LB2
HW DB 'Hello, world!$' ]PdpC"
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CODESEG TSu^.K
MOV AX, @data $$YLAgO4
MOV DS, AX 4/D~H+k
MOV DX, OFFSET HW v8g3]MVj3
MOV AH, 09H Q"c!%`\
INT 21H -eAo3
MOV AX, 4C00H g;en_~g3j
INT 21H K]dqK'
END Zrfp4SlZZ
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x86 CPU,GNU/Linux,NASM ^EU&6M2
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). 'R6D+Vk/
;Enter this into "hello.asm" then type: =DTn9}u
;"nasm -f elf hello.asm" gOw|s1`2,
;"ld hello.o -o hello" ~D@pk>I
;"./hello" )CS7>Vx
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section .data ;data section declaration :6LOb f\01
msg db 'Hello World!',0AH cqeId&Cg
len equ $-msg ;string length G-oCA1UdN
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section .text ;code section declaration S|T:rc(~
global _start ;entry point (start of execution) ?!(/;RU1
_start: mov edx,len ;string length UNocm0!N'
mov ecx,msg ;string start @%J?[PG
mov ebx,1 ;file handle: stdout G\h8j*o
mov eax,4 ;sys_write QQ@, v@j5
int 80h ;kernel system call BXueOvO8
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mov ebx,0 ;return value v}dt**l
mov eax,1 ;sys_exit THQW8 V
int 80h ;kernel system call oMda)5 &
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x86 CPU,Windows,MASM32 j-$aa;
.386 l1`Zp9I
.model flat,stdcall 6, ag\
option casemap:none "%ag^v9
;Include 文件定义 L.(T"`-i
include windows.inc ^8)&~q*
include user32.inc |w[}\#2
includelib user32.lib R@>R@V>c
include kernel32.inc [a;lYsOsJ
includelib kernel32.lib ~bT0gIc
;数据段 hXS'*vO"
.data Kbx (^f12
szCaption db 'A MessageBox!',0 Q3%a=ba)h
szText db 'Hello,world!',0 9<<$uf.B
;代码段 0<{/T*AU:
.code IC[SJVH;
start: !_<. 6ja
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK `{I,!to
invoke ExitProcess,NULL 5WP[-J)
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 9}X3Q!iFb
end start mL+}Ka
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BEGIN { print "Hello, world!" } 4q@o4C<0
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BASIC F-k1yZ?^
传统版BASIC(例如GWBASIC): MS^,h>KI
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10 PRINT "Hello, world!" /(n)I
20 END UE7P =B
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或在提示符输入: }3:TPW5S
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?"Hello, world!":END y5a^xRDw
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现代版BASIC(例如Quick BASIC): f]T1:N*t
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Print "Hello, world!" $$ _ uQf
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以下的语句在Quick BASIC中同样有效: \+GXUnkj
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? "Hello,world!" \Qk:\aLR
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GET "LIBHDR" 9ciL<'H\
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LET START () BE ^ bM;C_<$f
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WRITES ("Hello, world!*N") Kox~k?JK
$) b,T=0W
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Befunge 2l5@gDk5
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#include <stdio.h> SVq7qc9K?
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int main(void) l'16B^
{ E=s`$ A
printf("Hello, world!\n"); iUI,r*
return 0; DvOg|XUU0
} njUM>E,'
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C++ Tg:NeAN7(
#include <iostream> 3;:xEPb._6
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int main() 3'/wRK l
{ ) ]~HjA;
std::cout << "Hello, world!" << std::endl; r456M-~
return 0; _%1.D0<~-E
} 38'H-]8q"
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C++/CLI ,+'f unH
int main() J.?p?-"
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System::Console::WriteLine("Hello, world!");
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C# (C Sharp) m9e$ZZG$
class HelloWorldApp #='#`5_5
{ ^Ws~h\{%
public static void Main() um8ZhXq
{ :sA-$*&x
System.Console.WriteLine("Hello, world!"); Yhsb$wu
} }+=@Ci
} 5<a<!]|C
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COBOL g:,4Kd|
IDENTIFICATION DIVISION. 'M'LJ.,"/
PROGRAM-ID. HELLO-WORLD. wy-!1wd
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ENVIRONMENT DIVISION. wK\SeX
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DATA DIVISION. >XZq=q]E!
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PROCEDURE DIVISION. a9qZI
DISPLAY "Hello, world!". g)p[A 4
STOP RUN. =G72`]#-
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Common Lisp }oU&J81
(format t "Hello world!~%") S7SPc
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DOS批处理 Xs?>6i@$$
@echo off rU~"A
echo "Hello, world!" (f.A5~e
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