“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。 1Ii| {vR
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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》。 zO2{.4
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以下是用不同语言写成的Hello World程序的几个例子: I6w/0,azC
Ada 1i,4".h?M
with Ada.Text_Io; use Ada.Text_Io; wu^q`!ml
procedure Hello is fA
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begin [@.B4p
Put_Line ("Hello, world!"); k:0P+d
end Hello; %]jQ48^R
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汇编语言 'O "kt T
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x86 CPU,DOS,TASM FGVb@=TO>
MODEL SMALL 9v?V
IDEAL X%J%A-k]
STACK 100H 2v^lD('
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DATASEG a!u3HS-i
HW DB 'Hello, world!$' R~c1)[[E
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CODESEG Ao*FcrXN
MOV AX, @data Q&wYc{TUbm
MOV DS, AX
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MOV DX, OFFSET HW h6FgS9H
MOV AH, 09H :@e\'~7sH
INT 21H %c0z)R~
MOV AX, 4C00H 2?1}ZXr
INT 21H w
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END |uQ[W17^N
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x86 CPU,GNU/Linux,NASM PN9^[X
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). Ut;'Gk
;Enter this into "hello.asm" then type: z@`@I
;"nasm -f elf hello.asm" U$09p;~$Ww
;"ld hello.o -o hello" kknhthJ
;"./hello" 0.(Ml5&e
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section .data ;data section declaration 7kM4Ei
msg db 'Hello World!',0AH Qi|?d7k0
len equ $-msg ;string length nk>8SW^
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section .text ;code section declaration dqwWfn1lt
global _start ;entry point (start of execution) iE+6UK
_start: mov edx,len ;string length yjv&4pIc1
mov ecx,msg ;string start $P_x v
mov ebx,1 ;file handle: stdout ~bFdJj 1*
mov eax,4 ;sys_write =VCQ*
int 80h ;kernel system call %%x0w^
r4S=I
mov ebx,0 ;return value k) 3s?
mov eax,1 ;sys_exit \d$Rd")w
int 80h ;kernel system call /sH0x,V
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x86 CPU,Windows,MASM32 %OFj
.386 _M&{^d
.model flat,stdcall U_}hfLILi
option casemap:none T8mY#^sW_
;Include 文件定义 'W+i[Ep5Q
include windows.inc G)4SWu0<t
include user32.inc m/" J
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includelib user32.lib \3:
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include kernel32.inc 6.UKB<sV
includelib kernel32.lib 1::LN(`<
;数据段 K
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.data J2=*-O:
szCaption db 'A MessageBox!',0 /6smVz@O
szText db 'Hello,world!',0 A{t"M-<
;代码段 Fi/jR0]e2
.code [{/$9k-aF?
start: )ZeLaa P
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 79a9L{gso
invoke ExitProcess,NULL n8Q*
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;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> p*!q}%U
end start <YSg~T
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BEGIN { print "Hello, world!" } z2ds8-z
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BASIC " C&x,Ic
传统版BASIC(例如GWBASIC): IF^[^^v+H
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10 PRINT "Hello, world!" %/X2 l
20 END .2/,XwIr
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或在提示符输入: ^} tLnF
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?"Hello, world!":END =}"R5
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现代版BASIC(例如Quick BASIC): &6Ns7w6*z
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Print "Hello, world!" jB` 7T^bU
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以下的语句在Quick BASIC中同样有效: q'by;g*m
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? "Hello,world!" aDXpkG0E
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GET "LIBHDR" ` v>/
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LET START () BE i>WOYI9
$( 0}6QO
WRITES ("Hello, world!*N") J/L)3y
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Befunge f8R+7Ykx
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C i_|h{JK)
#include <stdio.h> ;B*L1'FF%t
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int main(void) JN-D/s
{ N&x@_t""
printf("Hello, world!\n"); 5
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return 0; #j\*Lc"Ur:
} /7.wQeL9
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C++ <.;@ksCPW{
#include <iostream> D`1I;Tb#
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int main() ="/R5fp
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std::cout << "Hello, world!" << std::endl; WW)_Wh
return 0; *QMF
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} ?SHc}iaU#
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C++/CLI GjG{qR
int main() "K9vm^xP
{ 'SsPx&)l
System::Console::WriteLine("Hello, world!"); ]|H]9mys98
} r!"CH5dT
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C# (C Sharp) ]H@v
class HelloWorldApp L&