“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。 k=&UV!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》。 !,Uzt1K:
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以下是用不同语言写成的Hello World程序的几个例子: O[<YYL0
Ada O'.sK pXe
with Ada.Text_Io; use Ada.Text_Io; xf|vz|J?y
procedure Hello is jCK 0+,;
begin 8M6wc394
Put_Line ("Hello, world!"); &P:2`\'
end Hello; :jHDeF.A
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汇编语言 a<CJ#B2K
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x86 CPU,DOS,TASM /6@$^paB
MODEL SMALL H"b}lf
IDEAL crlCN
STACK 100H 9D`p2cO
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DATASEG ,t|qhJF
HW DB 'Hello, world!$' Lk`,mjhk
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CODESEG bNh~=[E
MOV AX, @data hi0-Sw
MOV DS, AX wQw&.)T
MOV DX, OFFSET HW T`W37fz0
MOV AH, 09H qA>C<NL
INT 21H ?'/#Gt`
MOV AX, 4C00H M{)|9F
INT 21H Dd'4W
END 60XTdJkDkA
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x86 CPU,GNU/Linux,NASM 79d<,q;uR
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). Sau?Y
;Enter this into "hello.asm" then type: WT '?L{
;"nasm -f elf hello.asm" j`l'Mg
;"ld hello.o -o hello" <tI_u ~P
;"./hello" 2q}lSa7r
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section .data ;data section declaration )u>/:
msg db 'Hello World!',0AH Lg2z `uv
len equ $-msg ;string length $*qQ/hi
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section .text ;code section declaration j}aU*p~N
global _start ;entry point (start of execution) &:[hUn8jU
_start: mov edx,len ;string length As+^6
mov ecx,msg ;string start @p[ml m
mov ebx,1 ;file handle: stdout X*<
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mov eax,4 ;sys_write i-M<_62c
int 80h ;kernel system call .`~=1
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mov ebx,0 ;return value uGY(`
mov eax,1 ;sys_exit *T-v^ndJh
int 80h ;kernel system call f5P@PG]{
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x86 CPU,Windows,MASM32 w\%AR1,rs
.386
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.model flat,stdcall fD~f_Wr
option casemap:none Xu%8Q?]
;Include 文件定义 kn= fW1
include windows.inc XGSgx
include user32.inc WKB
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includelib user32.lib "7}e~*bM?`
include kernel32.inc get$r5
includelib kernel32.lib H]PEE!C;xC
;数据段 4O'%$6KR(
.data ,jJbQIu#
szCaption db 'A MessageBox!',0 WVdF/H
szText db 'Hello,world!',0 @XN*H- |
;代码段 ;t\C!A6
.code # 5b
start: 6g 5Lf) yG
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK V!zU4!@qP
invoke ExitProcess,NULL m/p:W/0L
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 'M=V{.8U
end start r%FfJM@!
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gT#hF]c:
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BEGIN { print "Hello, world!" } xi}3)5
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BASIC wj-z;YCV
传统版BASIC(例如GWBASIC): d6zfP1lQ
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10 PRINT "Hello, world!" _KAg1Ww
20 END ftccga
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或在提示符输入: u69fYoB'
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?"Hello, world!":END jPmp=qg"q
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现代版BASIC(例如Quick BASIC): <4RP:2#
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Print "Hello, world!" A ^X 1
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以下的语句在Quick BASIC中同样有效: Q)93+1]
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? "Hello,world!" Qt"i
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BCPL nrJW.F]S8[
GET "LIBHDR"
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LET START () BE yBnUz"
$( ^wMZG'/
WRITES ("Hello, world!*N") x2Dg92
$) 0jMS!"k
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Befunge f_;6uCCO
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C Ag_I'
#include <stdio.h> %Z{ 7*jtE
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int main(void) I@l }%L
{ \ 3FOI
printf("Hello, world!\n"); M1 _1(LSU
return 0; u8b^DB#+W
} Bw4 _hlm
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C++ CNrK]+>
#include <iostream> C#:L.qK
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int main() cnR18NK
{ :i/uRR
std::cout << "Hello, world!" << std::endl; x|U[|i,;
return 0; /}R*'y
} ;Ff5ooL{
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C++/CLI ?f4jqF~Fh
int main() G\/7V L
{ MRa
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System::Console::WriteLine("Hello, world!"); S*S@a4lV7
} YHfk; FI
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C# (C Sharp) =6< Am
class HelloWorldApp t[HA86X
{ %C~LKs5oH
public static void Main() k/.a
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{ R d>PE=u
System.Console.WriteLine("Hello, world!"); V^qkHm e
} .;jp2^
} OuV
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COBOL ;*q
IDENTIFICATION DIVISION. qN(,8P\90
PROGRAM-ID. HELLO-WORLD. ]n^TN
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ENVIRONMENT DIVISION. taqmtXU=(
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DATA DIVISION. /6nj
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PROCEDURE DIVISION. 3B3l)eX
DISPLAY "Hello, world!". Y(Q!OeC
STOP RUN.
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Common Lisp lt{yo\
(format t "Hello world!~%") e2vLUlL8
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DOS批处理 2qe]1B;
@echo off N9X`81)t
echo "Hello, world!" |!\5nix3A>
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Eiffel )&wJ