“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。 BOn2`|oLuF
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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》。 di`Ql._M
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以下是用不同语言写成的Hello World程序的几个例子: ofl3G
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Ada L~Epd.,Dt
with Ada.Text_Io; use Ada.Text_Io; K9}ppgL'$
procedure Hello is qHg\n)R"x!
begin T30!'F(*,
Put_Line ("Hello, world!"); g^"",!J/
end Hello; mgX0@#wFn
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汇编语言 mkTf}[O
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x86 CPU,DOS,TASM Fs<kMT
MODEL SMALL -DhF> 4f
IDEAL _;$VH4(BI
STACK 100H 'Wl))lB
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DATASEG Skl1%`
HW DB 'Hello, world!$' N%/Qc hu
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%x
CODESEG g=Q#2/UQ<
MOV AX, @data x$I~y D
MOV DS, AX /K<Xr[z~y
MOV DX, OFFSET HW ^10*s,(uS?
MOV AH, 09H }8GCOY
INT 21H j"HB[N
MOV AX, 4C00H =El.uBz{
INT 21H E}mnGe
END 15#v|/wI'
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x86 CPU,GNU/Linux,NASM lQ!ukl)
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). %Y:'5\^lC
;Enter this into "hello.asm" then type: d4/snvq
;"nasm -f elf hello.asm" yC4JYF]JN
;"ld hello.o -o hello" 3>yb$ZU"-
;"./hello" )-#%
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section .data ;data section declaration %JBp~"
msg db 'Hello World!',0AH {_|~G|Z
len equ $-msg ;string length }k7@
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section .text ;code section declaration yPn5l/pDDr
global _start ;entry point (start of execution) u2y?WcMv
_start: mov edx,len ;string length S%-L!V ,
mov ecx,msg ;string start -7TT6+H)
mov ebx,1 ;file handle: stdout lMB^/-Y
mov eax,4 ;sys_write {HNGohZt
int 80h ;kernel system call /cexd_l|f
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mov ebx,0 ;return value F N;X"it.
mov eax,1 ;sys_exit Qr1%"^4
int 80h ;kernel system call ny'~pT'00
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x86 CPU,Windows,MASM32 ueZ `+g~gg
.386 5[]7baO)h1
.model flat,stdcall k4'rDJfB
option casemap:none .Gh-T{\V'
;Include 文件定义 thOQcOf0$
include windows.inc %A`f>v.7 c
include user32.inc ;n00kel$
includelib user32.lib EN` --^
include kernel32.inc QL"fC;xUn,
includelib kernel32.lib 3X89mIDr
;数据段 &Ph@uZ\
.data
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szCaption db 'A MessageBox!',0 YMj
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szText db 'Hello,world!',0 $dFEC}1t
;代码段 ?%i|].<-'
.code Ui@Q&%b
start: }N:0%Gk[;
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK .T
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invoke ExitProcess,NULL &48wa^d
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> *I(>[m!
end start TjncW/\Z
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BEGIN { print "Hello, world!" } :R{Xd{?
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传统版BASIC(例如GWBASIC): c>:}~.~T
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10 PRINT "Hello, world!" L0qo/6|C
20 END Z9cch-u~
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或在提示符输入: qm4 Ejc<
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?"Hello, world!":END =S4_^UY;
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现代版BASIC(例如Quick BASIC): L10Vq}W"
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Print "Hello, world!" Pan^@B=Q
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以下的语句在Quick BASIC中同样有效: q!$ZBw-7>A
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? "Hello,world!" &Zs h-|N
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BCPL CA7tI >y_
GET "LIBHDR" MM3X!
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LET START () BE E[/<AY^@!z
$( m%m/#\J E
WRITES ("Hello, world!*N") _=3H!b =
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Befunge J~V`"uo
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#include <stdio.h> kn 5q1^
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int main(void) mLd=+&M
{ UtIwrR[
printf("Hello, world!\n"); QzT )PtX
return 0; ib /B!?/
} 'vgw>\X(
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C++ puG$\D-[
#include <iostream> ^6Q(he
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int main() sEt5!&