“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。 P<WCW3!JZ
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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》。 Pwh0Se5Z
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以下是用不同语言写成的Hello World程序的几个例子: XLNR%)l
Ada =`MU*Arcs[
with Ada.Text_Io; use Ada.Text_Io; v{dvB:KP5X
procedure Hello is 6$|!_94>*)
begin g`BtG
Put_Line ("Hello, world!"); )+S^{tt
end Hello; L&2 Zn{#`
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汇编语言 pNzSy"Y$
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x86 CPU,DOS,TASM )D1=jD(
MODEL SMALL :UgCP ~Y
IDEAL wUbs9y<
STACK 100H bez_|fY{T
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DATASEG qrtA'fU
HW DB 'Hello, world!$' f\~OG#AaX
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CODESEG <!r0[bKz@
MOV AX, @data
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MOV DS, AX MSw:Ay[9
MOV DX, OFFSET HW i$ :\,
MOV AH, 09H LYv$U;*+
INT 21H ^Q'^9M2)
MOV AX, 4C00H A=5A8B1
INT 21H *Bgk3(n)
END UFoxv)
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x86 CPU,GNU/Linux,NASM I2$.o0=3Y
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). c5t],P
;Enter this into "hello.asm" then type: (K(6`~
;"nasm -f elf hello.asm" JWuF ?<+k
;"ld hello.o -o hello" SqF9#&F
;"./hello" +%hA6n
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section .data ;data section declaration `T]1u4^E
msg db 'Hello World!',0AH Mk -Rl
len equ $-msg ;string length rz@;Zn
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section .text ;code section declaration N d"4*l;
global _start ;entry point (start of execution) cF7efs8u
_start: mov edx,len ;string length %;Dp~T`0
mov ecx,msg ;string start #l!Sz247
mov ebx,1 ;file handle: stdout KF#,Q
mov eax,4 ;sys_write P,ox))+6
int 80h ;kernel system call I C6}s
;
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mov ebx,0 ;return value }LaRa.3
mov eax,1 ;sys_exit M@n9i@UsO
int 80h ;kernel system call T!T6M6?
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x86 CPU,Windows,MASM32 3O:gZRxK
.386 N!fTt,
.model flat,stdcall +H7lkbW
option casemap:none $]G_^ji)K
;Include 文件定义 JY|f zL
include windows.inc jJN.(
include user32.inc JDyP..Dt
includelib user32.lib Q599@5aS
include kernel32.inc (>E70|T
includelib kernel32.lib =psX2?%L
;数据段 j(`L)/|O
.data ].j;d2xT\
szCaption db 'A MessageBox!',0 m&H@f:
szText db 'Hello,world!',0 j5,vSh~q;'
;代码段 AC$:.KLI
.code uH}cvshv
start: pL{h1^O}
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK J 1?)z+t9~
invoke ExitProcess,NULL $LLy#h?V]
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end start [_&\wHX
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BEGIN { print "Hello, world!" } 7n-;++a5]
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BASIC P+m{hn~%
传统版BASIC(例如GWBASIC): ov{
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10 PRINT "Hello, world!" VPB,8zb]
20 END 36<PI'l#~
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或在提示符输入: <mm.b
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?"Hello, world!":END @w)Vt$+b]
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现代版BASIC(例如Quick BASIC): *LTFDC
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Print "Hello, world!" =kp-[7
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以下的语句在Quick BASIC中同样有效: iUv#oX
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? "Hello,world!" U{2[nF
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GET "LIBHDR" akuV9S
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LET START () BE $nB4Ie!WcR
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WRITES ("Hello, world!*N") _E[zYSo`
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#include <stdio.h> ,k*g`OTW
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int main(void) iWbrX1
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printf("Hello, world!\n"); v !~lVv&
return 0; \/3Xb
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#include <iostream> Bn83W4M
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int main() `K.2&6xc
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int main() E2 M|b
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System::Console::WriteLine("Hello, world!"); v(+9&
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C# (C Sharp) {&_1/
class HelloWorldApp d4Y8q1
{ |!VSed#FSn
public static void Main() KTV~g@Jf
{ Yx4TUA$c'
System.Console.WriteLine("Hello, world!"); oe<9CK:?>
} $Hr
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COBOL Nf.6:=
IDENTIFICATION DIVISION. b5kw*h+/'h
PROGRAM-ID. HELLO-WORLD. ^l}Esz`-M
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ENVIRONMENT DIVISION. h
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DATA DIVISION. 2!Ip!IQ:
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PROCEDURE DIVISION. C5Fk>[fS
DISPLAY "Hello, world!". >k gL N
STOP RUN. W,<P])
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Common Lisp )Mw<e
(format t "Hello world!~%") zJE$sB.f
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DOS批处理 iNn]~L1
@echo off e;1n!_l\
echo "Hello, world!" *#O8 ^3D_c
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Eiffel Z^AOV:|m
class HELLO_WORLD 7Sc._G{[%
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creation a!Z.ZA
make YzTmXwuA5
feature k 7 !{p
make is H-&Z+4 +Xs
local pkd#SY
io:BASIC_IO W2CCLq1(
do mez )G|
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io.put_string("%N Hello, world!") 6$"gm$3O]
end -- make o)_;cCr)q
end -- class HELLO_WORLD h,:8TMJRRN
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Erlang i
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-module(hello). k5]M~"
-export([hello_world/0]). J&%d(EJM
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hello_world() -> io:fwrite("Hello, World!\n"). xHs8']*\
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." Hello, world!" CR f0S&