“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。 je$R\7B<
O#<|[Dzw
将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 _oYA;O
bUEt0wRR
以下是用不同语言写成的Hello World程序的几个例子: U:C-\ M
Ada fbW,0
with Ada.Text_Io; use Ada.Text_Io; [U_Q 2<H
procedure Hello is 4IH0un
begin 0Te)s3X
Put_Line ("Hello, world!"); e\+~
end Hello; wt3Z?Pb
T/X?ZK(T
3(XHF3q
汇编语言 [v>Z(
S:"z<O
x86 CPU,DOS,TASM Vb"T],N1m
MODEL SMALL N
P0Hgd
IDEAL k1@
A'n
STACK 100H wjw<@A9
l=<F1L z
DATASEG v>yGsJnV'
HW DB 'Hello, world!$' ,
.NG.Q4f
[7ek;d;'t
CODESEG h|Teh-@A5
MOV AX, @data _
cHV3cz
MOV DS, AX +)''l
MOV DX, OFFSET HW `i_L?C7
MOV AH, 09H ~Iu21Q(*
INT 21H /I`!iK
MOV AX, 4C00H Z n"TG/:
INT 21H vi()1LS/!
END e{#a{`?Uez
}(O D<
3HDnOl8t
x86 CPU,GNU/Linux,NASM ._F6- pl
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). u:qD*zOq
;Enter this into "hello.asm" then type: ~L Bq5a
;"nasm -f elf hello.asm" VAG+y/q
;"ld hello.o -o hello" r5fz6"
;"./hello" :p*ojl|
bo?3E +B
section .data ;data section declaration ]CtoK%k
msg db 'Hello World!',0AH d"e%tsj
len equ $-msg ;string length DftGy:Ah3
0wa!pE"
section .text ;code section declaration Ot8S'cB1,$
global _start ;entry point (start of execution) %o_0M^3W
_start: mov edx,len ;string length g)|++?
mov ecx,msg ;string start ?AM8*w
mov ebx,1 ;file handle: stdout 6=`m
mov eax,4 ;sys_write kxKnmB#m-
int 80h ;kernel system call 3T.M?UG>
el*pYI
mov ebx,0 ;return value AD4L`0D
mov eax,1 ;sys_exit 6@Z'fT4
int 80h ;kernel system call Yqz[sz5+m
ky
lr f4=
c<t3y7
x86 CPU,Windows,MASM32 z)?#UdBQv
.386 e8ig[:B>+
.model flat,stdcall u^4 "96aXJ
option casemap:none 1RUbY>K#U
;Include 文件定义 >stVsFdV)
include windows.inc p'w"V6k('~
include user32.inc h1UlLy8
includelib user32.lib KE)D =P
include kernel32.inc \i;~~;D
includelib kernel32.lib 1\.zOq#
;数据段 CFS3);'<|
.data /B#lju!
szCaption db 'A MessageBox!',0 *~lgU4
szText db 'Hello,world!',0 K
{1ZaEH
;代码段 Lw+1|
.code ^J}$y7
start: GVHfN5bTqn
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK +68K[s,FD
invoke ExitProcess,NULL ~)_ ?:.Da
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> :pF]TY"K.
end start 6/WK((Fd
K1wN9D{t'
pGcx
jm
AWK re 1k]
BEGIN { print "Hello, world!" } 1&dsQ,VDl
QmkC~kK1.
8UY=}R2C
BASIC pQ-^T.'
传统版BASIC(例如GWBASIC): LK-6z w5=(
oTV8rG
10 PRINT "Hello, world!" X!A]V:8dk
20 END sz2SWk^&
r/$)c_x`
或在提示符输入: elHarey`f
LXfeXWw?,
?"Hello, world!":END ';CuJXAj
[+cnx21{
现代版BASIC(例如Quick BASIC): 'LLQ[JJ=O
a]=vq(N'r
Print "Hello, world!" ?`*-QG}
s2v#evI`+
以下的语句在Quick BASIC中同样有效: Z6/~2S@
X.4ZLwX=
? "Hello,world!" IWR q:Gw
{s^ryv_}
;F]|HD9
BCPL /B?SaKh
GET "LIBHDR" !}Ou|r4_
V-U
^O45
LET START () BE lX k-86[M
$( gwB>oi*OE
WRITES ("Hello, world!*N") a:%5.!Vd
$) _x|8U'|Ce
a4qpnr]0
sluZ-,zE
Befunge _(kwD^x6O{
"!dlrow olleH">v A=[f>8
, <Ibr.L]
^_@ ht)*Ync
~aR='\<