“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。 *z q .C
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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》。 P/ci/y_1
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以下是用不同语言写成的Hello World程序的几个例子: EY kj@
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Ada 9 ~~qAoD
with Ada.Text_Io; use Ada.Text_Io; eOt%x Tx
procedure Hello is YZ+>\ x
begin VJDoH
Put_Line ("Hello, world!"); |8H_-n
end Hello; Z?17Pu'Dp
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汇编语言 i'HPRY
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x86 CPU,DOS,TASM 9JPEj-3`g
MODEL SMALL jv =EheD
IDEAL daslaa_A
STACK 100H o@9+mM"B)
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DATASEG %x2uP9
HW DB 'Hello, world!$' l&L,7BX
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CODESEG llq*T"7
MOV AX, @data 8Atq,GcG
MOV DS, AX *YtB )6j
MOV DX, OFFSET HW jY/ARBC}H
MOV AH, 09H ^gOww6$ <
INT 21H =A@>I0(7
MOV AX, 4C00H ~U$":~H[
INT 21H mu[Op*)
END fW(/Loh
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x86 CPU,GNU/Linux,NASM LL(|$}yW
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). R>2I RvY(
;Enter this into "hello.asm" then type: u7s"0f`
;"nasm -f elf hello.asm" "3fBY\>a
;"ld hello.o -o hello" =gjDCx$|
;"./hello" sN~ \+_
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section .data ;data section declaration PD6_)PXn
msg db 'Hello World!',0AH 7Xg?U'X
len equ $-msg ;string length D!F 2l_
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section .text ;code section declaration <*(^{a.O
global _start ;entry point (start of execution) G:IP? z]
_start: mov edx,len ;string length `Ye8
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mov ecx,msg ;string start lpgd#vr
mov ebx,1 ;file handle: stdout M`7y>Ud
mov eax,4 ;sys_write PFrfd_s{>\
int 80h ;kernel system call c_.-b=zm
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mov ebx,0 ;return value !eI2r
mov eax,1 ;sys_exit T2FE+ A]n9
int 80h ;kernel system call J?&l*_m;t
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x86 CPU,Windows,MASM32 ZU{4lhe
.386 <a(}kk}
.model flat,stdcall 3jZ6kfj
option casemap:none A+getdr
;Include 文件定义 IiJZ5'{
include windows.inc a5jL7a?6]
include user32.inc #_i`#d)
includelib user32.lib i-"
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include kernel32.inc ][&9]omB
includelib kernel32.lib ~P.I<
;数据段 @-&MA)SN
.data ! RW
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szCaption db 'A MessageBox!',0 3g~'5Ao
szText db 'Hello,world!',0 c{3wk7
;代码段 )e|=mtp
.code 9X$ma/P[
start: P{Lf5V9# <
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 47K1$3P
invoke ExitProcess,NULL n>>Qn&ym
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> c!K]J
end start j|4C\~i
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BEGIN { print "Hello, world!" } QX4ai3v
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BASIC <r#eL39I
传统版BASIC(例如GWBASIC): o1cErI&q"
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10 PRINT "Hello, world!" f y:,_#
20 END )G^
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或在提示符输入: y){
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?"Hello, world!":END }X*Riu7gk
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现代版BASIC(例如Quick BASIC): .sC?7O=
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Print "Hello, world!" p$Ox'A4
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以下的语句在Quick BASIC中同样有效: (bsXo
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? "Hello,world!" MjlP+; !
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BCPL g35DV6
GET "LIBHDR" 5?hw !
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LET START () BE *%{gYpn
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WRITES ("Hello, world!*N") Llr>9(|
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Befunge
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