“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。 =XucOli6
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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》。 l6YtEHNG
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以下是用不同语言写成的Hello World程序的几个例子: y#Fv+`YDl
Ada Rn`x7(WA
with Ada.Text_Io; use Ada.Text_Io; b$ve sJ
procedure Hello is kbTm^y"
begin 1|kvPo#
Put_Line ("Hello, world!"); ;1`fC@rI
end Hello; sYe?M,
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汇编语言 4]G?G]lS>
@wpN6 /
x86 CPU,DOS,TASM YQ+tDZY8`
MODEL SMALL #E?(vA1
IDEAL
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STACK 100H ,k{#S?:b
"U!AlZ`g
DATASEG WG N=Y~E
HW DB 'Hello, world!$' lD^]\;?
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CODESEG 0fb`08,^
MOV AX, @data u.d).da
MOV DS, AX pP*zq"o
MOV DX, OFFSET HW C\/xl#e<@
MOV AH, 09H co~Pyj
INT 21H A?CcHw
rT
MOV AX, 4C00H <j&DK2u=i
INT 21H p2n0Z\2
END P_?gq>E8
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x86 CPU,GNU/Linux,NASM C ~<'rO}|
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). c(:f\Wc3Z
;Enter this into "hello.asm" then type: @ zs'Y8
;"nasm -f elf hello.asm" ^T ?RK"p
;"ld hello.o -o hello" c_-drS
;"./hello" 8TGOx%}i
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section .data ;data section declaration YVYu:}e3)
msg db 'Hello World!',0AH 3HLNCt09
len equ $-msg ;string length (g[h
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c
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section .text ;code section declaration MHh~vy'HB5
global _start ;entry point (start of execution) Wc,~ {
_start: mov edx,len ;string length w.H%R-Be
mov ecx,msg ;string start X9p.gXF
mov ebx,1 ;file handle: stdout 9z}uc@#D=m
mov eax,4 ;sys_write M)eO6oX|
int 80h ;kernel system call B:gjAb}9T
*of3:w
mov ebx,0 ;return value JRSSn] pw
mov eax,1 ;sys_exit 19O,a#{KHf
int 80h ;kernel system call $^OvhnL/
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plb!.g
x86 CPU,Windows,MASM32 rM .|1(u
.386 )Y2{_ bx4"
.model flat,stdcall Gnfd;.
(.
option casemap:none 4US"hexE<
;Include 文件定义 #0ETY\}ZD
include windows.inc S{;sUGcu
include user32.inc c0%"&a1]]V
includelib user32.lib f0X_fm_q
include kernel32.inc bn^{c
includelib kernel32.lib NWM8[dI
;数据段 V n*
.data xnmmXtk
szCaption db 'A MessageBox!',0 O-LO/*5MI
szText db 'Hello,world!',0 ` D= S{
;代码段 S/D^
.code <F}_ /q1
start: 5Yl<h)1
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK }dp=?AFg
invoke ExitProcess,NULL 2.% .Z_k)
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ^C_#<m_k
end start |/09<F:L[
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BEGIN { print "Hello, world!" } *^f<W6xc
B[V+ND'(
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BASIC p1&b!*o- &
传统版BASIC(例如GWBASIC): 7g%E`3)"
+6';1Nb@
10 PRINT "Hello, world!" &K.?p2$X
20 END (vb
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或在提示符输入: qOSM}ei>s
QV{}K
?"Hello, world!":END w*oeK
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现代版BASIC(例如Quick BASIC): xL{a
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Print "Hello, world!" %]>KvoA
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以下的语句在Quick BASIC中同样有效: +tVaBhd!
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? "Hello,world!" 4WJ.^ (
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^ cyX
BCPL v#.r.{t
GET "LIBHDR" 7T1=q{#M
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LET START () BE 8Le||)y,\
$( (>r[-Bft
WRITES ("Hello, world!*N") Cq%IE^g<
$) )rekY;
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Befunge 3wC' r
"!dlrow olleH">v :.$3vaZ@
, }[4r4 1[
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M+w=O!dq
Brainfuck ptU\[Tq
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< *T5!{
+++++++++++++++.>.+++.------.--------.>+.>. w]]8dz
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C BDR.AZ
#include <stdio.h>
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int main(void) ;*:Pw?'
{ R'C2o]
printf("Hello, world!\n"); eD*A)
return 0; P;Ga4Q.
} MM(xk
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q U]gj@R
C++ kzt(i Y_6
#include <iostream> <})2#sZO!
w-Da~[J
int main() vTJ}8
{ %k'!Iq+
std::cout << "Hello, world!" << std::endl; @Ub"5Fl4
return 0; J/[=p<I)
} 0cJWJOj&
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R}q>O5O
C++/CLI r\/9X}y4z
int main() UFp,a0|
{ oxz OA
System::Console::WriteLine("Hello, world!"); x
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} P] UJ0b
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C/TF-g-_Y
C# (C Sharp) ug+io mZ
class HelloWorldApp MLRK74D
{ xwJH(_-
public static void Main() :}@g6
{ E0MGRI"me
System.Console.WriteLine("Hello, world!"); _nbBIaHN{
} `C$:Yf]%nG
} bO'Sgc[]
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=8; {\
COBOL aC%m- m
IDENTIFICATION DIVISION. uF1~FKB
PROGRAM-ID. HELLO-WORLD. @U3Vc|
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