“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。 ur%$aX)
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 F@W*\3)
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以下是用不同语言写成的Hello World程序的几个例子: }0/a\
Ada 5D`26dB2
with Ada.Text_Io; use Ada.Text_Io; 'x%x'9OP
procedure Hello is b)}+>Wx
begin :[7lTp
Put_Line ("Hello, world!"); MiGcA EF;
end Hello; D!3{gV#
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汇编语言
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x86 CPU,DOS,TASM hl/itSl$
MODEL SMALL a|qsQ'1,;
IDEAL :{}_|]>K
STACK 100H .KA V) So"
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DATASEG POd/+e9d
HW DB 'Hello, world!$' bg7n
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CODESEG Wr%7~y*K
MOV AX, @data I48VNX
MOV DS, AX :F(9"L
MOV DX, OFFSET HW LJuW${Y
MOV AH, 09H I0w%8bs
INT 21H Gp2!xKgm
MOV AX, 4C00H lgD]{\O$ip
INT 21H &d^=siL
END %$X\"
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x86 CPU,GNU/Linux,NASM Ol+Kp!ocY
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). pM$ @m]
;Enter this into "hello.asm" then type: @p!Q1-] =
;"nasm -f elf hello.asm" X>,A
;"ld hello.o -o hello" ZwJciT!_~
;"./hello" sBW3{uK
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section .data ;data section declaration o0Gx%99'
msg db 'Hello World!',0AH ;sQbn|=e"
len equ $-msg ;string length @EZ>f5IO+
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section .text ;code section declaration oXal
global _start ;entry point (start of execution) rxE&fjW
_start: mov edx,len ;string length 0D3OE.$0
mov ecx,msg ;string start JZx%J)
mov ebx,1 ;file handle: stdout [X"k>
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mov eax,4 ;sys_write l)Mh2lA,=
int 80h ;kernel system call W<'<'z5
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mov ebx,0 ;return value 0s%6n5>
mov eax,1 ;sys_exit hPO>,j^
int 80h ;kernel system call P;U@y"s
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x86 CPU,Windows,MASM32 Jt=>-Spj
.386 Bymny>.M
.model flat,stdcall 5'
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option casemap:none Y3oMh,
;Include 文件定义 i?>Hr|
include windows.inc lX;mhJj!
include user32.inc MUwVG>b8J~
includelib user32.lib /$`;r2LG
include kernel32.inc h}6_ybmZ
includelib kernel32.lib tgN92Q.i6T
;数据段 #5{sglC"|F
.data > V%Q O>C
szCaption db 'A MessageBox!',0 42@a(#z(U
szText db 'Hello,world!',0 LknVqZ|k
;代码段 %V_eJC""?
.code mw+j|{[
start: h$&rE@N|
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK FAtWsk*pgY
invoke ExitProcess,NULL {hd-w4"115
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> OmNn,PCl8
end start #"r kuDO
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AWK #s^s_8#&e
BEGIN { print "Hello, world!" } mQ,{=C=D
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BASIC /0\QL+^!
传统版BASIC(例如GWBASIC): HD00J]y_
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10 PRINT "Hello, world!" dq1TRFu
20 END j+0.=#{??
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或在提示符输入: B\zoJg&7(
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?"Hello, world!":END 04\Ta
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现代版BASIC(例如Quick BASIC): a7 )@BzF#
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Print "Hello, world!" ?N_)>&b
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以下的语句在Quick BASIC中同样有效: ZgBckb
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? "Hello,world!" npj5U/
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BCPL m)k-uWc$C
GET "LIBHDR" sL
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LET START () BE L8Dm9}
$( T#N80BH[
WRITES ("Hello, world!*N") Nuq(4Yf1W
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Befunge ]:!8 s\#
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#include <stdio.h> .Nk6
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int main(void) F]0Jwm{
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printf("Hello, world!\n"); ^@Y9!G=
return 0; &gJW6<
} 6ku8`WyoF
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C++ Pgx+\;w"
#include <iostream> 13\Sh
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int main() NC;T( @
{ e00RT1L
std::cout << "Hello, world!" << std::endl; Z{
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return 0; JkJhfFV
} ^X$
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C++/CLI g\qX7nIH?
int main() (\tq<h0
{ FfjC
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System::Console::WriteLine("Hello, world!"); &!4(
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} % hNn%Oy:E
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C# (C Sharp) 01-p
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class HelloWorldApp g8Ok ^
{ e5FCqNip'
public static void Main() ZIDFF
{ Hc>([?P%t
System.Console.WriteLine("Hello, world!"); Q4#\{" N!
} DCz\TwzU
} J&(
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COBOL gq=0L:
IDENTIFICATION DIVISION. G &m>Ov$#&
PROGRAM-ID. HELLO-WORLD. -DA;KWYS
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ENVIRONMENT DIVISION. !d/`[9jY
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DATA DIVISION. y>?k<