“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。 5q?ZuAAA
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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》。 ,9p
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以下是用不同语言写成的Hello World程序的几个例子: DFt1{qS8@u
Ada K(HP PM\
with Ada.Text_Io; use Ada.Text_Io; ,tL<?6_
procedure Hello is r#pC0Yj!3
begin 5A6d]
Put_Line ("Hello, world!"); #SRGVa`x
end Hello; K_B-KK(^
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汇编语言 /wL}+
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x86 CPU,DOS,TASM v7/qJ9l
MODEL SMALL e? fFh,a
IDEAL ~V"D|U;i +
STACK 100H .~6p/fHX
DO$jX
4
DATASEG |L4K#
HW DB 'Hello, world!$' :-
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CODESEG ]J C}il_b
MOV AX, @data T0Q)}%L
MOV DS, AX yA!#>u%g
MOV DX, OFFSET HW A@EeX4N
MOV AH, 09H Kuy,qZv!"
INT 21H P/?`
MOV AX, 4C00H "el}@
INT 21H TCFx+*fBd
END Xb=9~7&,$
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x86 CPU,GNU/Linux,NASM ;X !sTs
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ]-&
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;Enter this into "hello.asm" then type: .3&zP
;"nasm -f elf hello.asm" IXugnvyV
;"ld hello.o -o hello" Sf)VQ5U!Y
;"./hello" 2mbZ6'p {
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section .data ;data section declaration M
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msg db 'Hello World!',0AH 5dS5,
len equ $-msg ;string length ^e>`ob
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section .text ;code section declaration :0j9
global _start ;entry point (start of execution) !t6:uC7H
_start: mov edx,len ;string length }Z-]m
mov ecx,msg ;string start !~cTe!T
mov ebx,1 ;file handle: stdout $z]gy]F
mov eax,4 ;sys_write k#%BxT
int 80h ;kernel system call !h{qO&ZH=
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mov ebx,0 ;return value =9e()j
mov eax,1 ;sys_exit DQd~!21\|
int 80h ;kernel system call HKCMKHR
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x86 CPU,Windows,MASM32 j9sf~}D>
.386 [:
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.model flat,stdcall *BT-@V.4
option casemap:none o jzO?z
;Include 文件定义 2![.Kbqa%
include windows.inc AW4N#gt8',
include user32.inc 'c\zWmAZ
includelib user32.lib JB a:))lw
include kernel32.inc h&||Ql1
includelib kernel32.lib impzqQlZ,
;数据段 c.Pyt
.data
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szCaption db 'A MessageBox!',0 %zyO}
szText db 'Hello,world!',0 |<P]yn
;代码段 vAi
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.code
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start: LZV
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK w%)=`'s_
invoke ExitProcess,NULL I3D8xl>P\
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end start
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AWK z@^l1)m
BEGIN { print "Hello, world!" } 0ejx;Mum
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BASIC #Na3eHT
传统版BASIC(例如GWBASIC): wX" 6 S:
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10 PRINT "Hello, world!" `UL#g![J
20 END Xz&Hfs"/J
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或在提示符输入: $%"i|KTsv:
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?"Hello, world!":END R3<>]/1p|P
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现代版BASIC(例如Quick BASIC): =O1N*'e
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Print "Hello, world!" h}i
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以下的语句在Quick BASIC中同样有效: Q5b?-
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? "Hello,world!" (p'yya{(
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:XEP:8
BCPL r4k=i4
GET "LIBHDR" nellN}jYsM
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LET START () BE t/LQ|/xo
$( 2i*-ET
WRITES ("Hello, world!*N") :t-a;Q;
$) ;BUJ5
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pw"
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Befunge \:-#,( .V
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+++++++++++++++.>.+++.------.--------.>+.>. Gf(hN|X.
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C ?pn<lW8d
#include <stdio.h> L|.q19b*
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int main(void) v=e`e68U~
{ VTQ V]>|
printf("Hello, world!\n"); e\%+~GUTC=
return 0; }kzGuNj
} :so2 {.t-
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C++ yH5^EY7rQ
#include <iostream> f#mBMdj
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int main() I[,tf!
{ wZB:7E%
std::cout << "Hello, world!" << std::endl; i3#To}g5V
return 0; Xmr|k:z
} @v{lH&K:;
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C++/CLI &AM<H}>
int main() ]Hr:|2|.
{ 8w1TX [b
System::Console::WriteLine("Hello, world!"); zY_xJ"/9
} 8axz`2 `
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C# (C Sharp) >Y,3EI\
class HelloWorldApp vC$Q4>m
{ XfY~q~f8
public static void Main() %B9iby8)1
{ GjTj..G/
System.Console.WriteLine("Hello, world!"); $7M/rF;N5X
} Gt;@.jY&
} $p_FrN{
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COBOL >JdA,i}1
IDENTIFICATION DIVISION. ~9#x/EG/
PROGRAM-ID. HELLO-WORLD. Twqkd8[
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ENVIRONMENT DIVISION. W5'07N^
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DATA DIVISION. p1}Y|m!
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PROCEDURE DIVISION. F\pw0^K;N
DISPLAY "Hello, world!". ~vf&JH'!
STOP RUN. e<_yr>9g"
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Common Lisp PqOy"HO
(format t "Hello world!~%") }qf9ra
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DOS批处理 1\v$8pP+
@echo off JGmW>mH
echo "Hello, world!" B_f0-nKP
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Eiffel re.%$D@
class HELLO_WORLD G5^gwG+
fVR:m`'Iq_
creation 7e,<$PH
make ~cE; k@
feature [\9WqHs
make is C=LXL1x2e
local A<6V$e$:2
io:BASIC_IO o?G^=0T
do E)(`Z0
!!io Dl862$_Q
io.put_string("%N Hello, world!") WY@x2bBi
end -- make gto@o\&=
end -- class HELLO_WORLD d6lhA 7
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Erlang ?e|'I"
-module(hello). m8rz
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-export([hello_world/0]). _ Ko0
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hello_world() -> io:fwrite("Hello, World!\n"). ]{9oB-;,
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Forth UQ|zSalv,
." Hello, world!" CR @LY 5]og
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Fortran @S~'m;
WRITE(*,10) d9/E^)TT
10 FORMAT('Hello, World!') syh0E=If_
STOP *8p\.za1
END IidZ-Il
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