“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。 x$(f7?s] 1
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 ft
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以下是用不同语言写成的Hello World程序的几个例子: S5EK~#-L[
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with Ada.Text_Io; use Ada.Text_Io; ]J]h#ZHx
procedure Hello is {(?4!rh
begin pmYHUj
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Put_Line ("Hello, world!"); !Xw5<J3L-
end Hello; (C)p9-,
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汇编语言 f`66h M[
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x86 CPU,DOS,TASM Yu`~U,m
MODEL SMALL r:TH]hs12+
IDEAL wwcBsJ1{
STACK 100H ^LzF@{ G
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DATASEG 7 Fsay+a
HW DB 'Hello, world!$' @9|hMo
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CODESEG |! "eWTJ
MOV AX, @data 6D_D' ;o
MOV DS, AX |
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MOV DX, OFFSET HW IO:G1;[/2L
MOV AH, 09H FML(4BY,
INT 21H w@fi{H(R
MOV AX, 4C00H ( &x['IR
INT 21H bi;1s'Y<D
END g<
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x86 CPU,GNU/Linux,NASM o#1 $q`Z
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). Eu04e N
;Enter this into "hello.asm" then type: seeBS/%
;"nasm -f elf hello.asm" El"Q'(:/U
;"ld hello.o -o hello" LBP`hK:>W~
;"./hello" ?=pT7M
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section .data ;data section declaration K\c#ig
msg db 'Hello World!',0AH BTrn0
len equ $-msg ;string length ;i+#fQO7Q
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section .text ;code section declaration uWE^hz"
global _start ;entry point (start of execution) lks!w/yCF
_start: mov edx,len ;string length 8, >P
mov ecx,msg ;string start d m%8K6|
mov ebx,1 ;file handle: stdout ;i:d+!3XwC
mov eax,4 ;sys_write QkC(uS
int 80h ;kernel system call q'MZ R'<@
;gr9/Vl
mov ebx,0 ;return value IIx#2r
mov eax,1 ;sys_exit uY'HT|@:{
int 80h ;kernel system call 7. ;3e@s
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x86 CPU,Windows,MASM32 @Do= k
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.model flat,stdcall S|+o-[e8O
option casemap:none 4H]L~^CD
;Include 文件定义 |P}y,pNQ
include windows.inc u,4eCxYE$
include user32.inc nzeX[*
includelib user32.lib JqiP>4Uwm^
include kernel32.inc }JAG7L&{
includelib kernel32.lib 8Uxne2e
;数据段 q> C'BIr
.data V3j= Kf
szCaption db 'A MessageBox!',0 8)I^ t81
szText db 'Hello,world!',0 H$4:lH&(
;代码段 h 9W^[6
.code lnR{jtWP
start: L*JjG sTH
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK #>+ HlT
invoke ExitProcess,NULL Y:a]00&)#Y
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end start N] sAji*
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BEGIN { print "Hello, world!" } q'82qY
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传统版BASIC(例如GWBASIC): s->^=dy
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10 PRINT "Hello, world!" ^gnZ+`3
20 END L;I]OC^J
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或在提示符输入: 8X|-rM{
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?"Hello, world!":END 0"bcdG<}
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现代版BASIC(例如Quick BASIC): C3YT1tK
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Print "Hello, world!" E^eVvP4uC@
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以下的语句在Quick BASIC中同样有效: CzEd8jeh7
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? "Hello,world!" W6/yn
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GET "LIBHDR" LSr]S79N1
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LET START () BE ?.;c$'
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WRITES ("Hello, world!*N") [HZv8HU|
$) 6,{$J
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Befunge G<v&4/\p`M
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#include <stdio.h> wDe& 1(T^
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int main(void) f=K]XTw~
{ v
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printf("Hello, world!\n"); [K0(RDV)%
return 0; x+@rg];m
} wi6
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C++ wEvVL
#include <iostream> b!5~7Ub.No
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int main() O[JL+g4
{ ;@Y;g(bw:
std::cout << "Hello, world!" << std::endl; ]|PiF+
return 0; 1NA.nw.
} X?qK0fS
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C++/CLI H]Z$OpI
int main() ;u46Z
{ D7Q$R:6|
System::Console::WriteLine("Hello, world!"); +}os&[S
} }*pi<s
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C# (C Sharp) _TQj~W<
class HelloWorldApp 7}5JDG
{ h^(*Tv-!
public static void Main() aNspMJ
{ PmEsN&YP]
System.Console.WriteLine("Hello, world!"); >$/>#e~
} ]Wlco
} gu.}M:u
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