“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。 &]/.=J
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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》。 +UP?M4g
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以下是用不同语言写成的Hello World程序的几个例子: T?FR@.
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Ada n?A;'\cK
with Ada.Text_Io; use Ada.Text_Io; "mkTCR^]e
procedure Hello is ,cFp5tV$
begin (tP^F)}e5
Put_Line ("Hello, world!"); o>Z+=&BZ@a
end Hello; $(%t^8{a~G
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汇编语言 bDPT1A`F
.c.#V:XZ#U
x86 CPU,DOS,TASM ;rH@>VrR
MODEL SMALL pF"IDC
IDEAL Yt;.Z$i ,
STACK 100H tI(co5 W
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DATASEG c^8y/wfok
HW DB 'Hello, world!$' n-_-;TYH
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CODESEG [t`QV2um
MOV AX, @data _/!IjB:(70
MOV DS, AX 3^zOG2
MOV DX, OFFSET HW %@FTg$
MOV AH, 09H VIxcyp0X
INT 21H ysiBru[u
MOV AX, 4C00H oMi"X"C:q
INT 21H 4%k_c79>
END "2bCq]I0
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x86 CPU,GNU/Linux,NASM -gV'z5
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). W;C41>^?/
;Enter this into "hello.asm" then type: ",T-'>h$2R
;"nasm -f elf hello.asm" 1jozM"H7Q
;"ld hello.o -o hello" <tg>1,C
;"./hello" [e'Ts#($A
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section .data ;data section declaration Sf\mg4,
msg db 'Hello World!',0AH oa|nQ`[
len equ $-msg ;string length b
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section .text ;code section declaration `D%bZ%25c
global _start ;entry point (start of execution) lU.@! rGbw
_start: mov edx,len ;string length Hd)4_
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mov ecx,msg ;string start HIi5kv]}|
mov ebx,1 ;file handle: stdout O=St}B\!m
mov eax,4 ;sys_write OPwj*b:-m
int 80h ;kernel system call ( Qw"^lE3
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mov ebx,0 ;return value ;HJ|)PN5L
mov eax,1 ;sys_exit g+k0Fw]!
int 80h ;kernel system call u#Qd`@p
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x86 CPU,Windows,MASM32 ;,]T|>M
.386 jxr~cp?4
.model flat,stdcall DO$jX
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option casemap:none |L4K#
;Include 文件定义 :-
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include windows.inc ;Z"6ve4
include user32.inc ]J C}il_b
includelib user32.lib T0Q)}%L
include kernel32.inc yA!#>u%g
includelib kernel32.lib [L,Tf_t^Y
;数据段 ,r{\aW@
.data u%S&EuX
szCaption db 'A MessageBox!',0 yla&/K;|*
szText db 'Hello,world!',0 F%x8y
;代码段 j']m*aM1>
.code *O|Z[>
start: Llk4 =p
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK T'l >$6
invoke ExitProcess,NULL {ls$#a+d
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> gfs?H #
end start 'kK}9VKl
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BEGIN { print "Hello, world!" } b$+.}&M
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BASIC w Maib3Q
传统版BASIC(例如GWBASIC): fNc3&=]]
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10 PRINT "Hello, world!" RUmJ=i'4/
20 END Uax- z
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或在提示符输入: qde.;Yv9
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?"Hello, world!":END &<-Sxjj
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现代版BASIC(例如Quick BASIC): |?SK.1pW
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Print "Hello, world!" m0W5O gk
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以下的语句在Quick BASIC中同样有效: SqTO~zGC
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? "Hello,world!" Y6/'gg'&5
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BCPL e;56}w
GET "LIBHDR" h84}lxT^]
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LET START () BE C$xU!9K[+
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WRITES ("Hello, world!*N") e7ixi^Q
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Befunge ;-47d ^
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