“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。 6T_K9
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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》。 q*bt4,D&Es
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以下是用不同语言写成的Hello World程序的几个例子: RU|X*3";T
Ada i'=2Y9S}
with Ada.Text_Io; use Ada.Text_Io; ,5{$+
procedure Hello is 'C^;OjAg
begin hO
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Put_Line ("Hello, world!"); /OG zt
end Hello; u h)o
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汇编语言 Xh}&uZ`A
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x86 CPU,DOS,TASM y^R4I_* z
MODEL SMALL ezUQ>
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IDEAL RYy,wVh}
STACK 100H D:9
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DATASEG UV@0gdy[
HW DB 'Hello, world!$' G?xJv`"9iC
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CODESEG O,'#C\
MOV AX, @data E7`qmn
MOV DS, AX {[W(a<%bXm
MOV DX, OFFSET HW ]Lm'RlV
MOV AH, 09H C6]OAUXy:F
INT 21H $gvr
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MOV AX, 4C00H ?:uNN
INT 21H ),`8eQC
END v+6e;xl8
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x86 CPU,GNU/Linux,NASM y'
[LNp V
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). cU8x Upq
;Enter this into "hello.asm" then type: ||Y<f *
;"nasm -f elf hello.asm" ~=cmM
;"ld hello.o -o hello" S&wzB)#'
;"./hello" u-:Ic.ZV
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section .data ;data section declaration 2 hq\n<
msg db 'Hello World!',0AH cP rwW6
len equ $-msg ;string length vFhz!P~
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section .text ;code section declaration 7u|B ](FS
global _start ;entry point (start of execution) wk @,wOt
_start: mov edx,len ;string length Y3rt5\!
mov ecx,msg ;string start 9 <\`nm
mov ebx,1 ;file handle: stdout PVYyE3`UB
mov eax,4 ;sys_write WD.U"YI8y
int 80h ;kernel system call !%[S49s
].m qxf
mov ebx,0 ;return value o35fifM`
mov eax,1 ;sys_exit =J/ FJb
int 80h ;kernel system call [Y/:@t"2y
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x86 CPU,Windows,MASM32 BC7 7<R!E)
.386 !Zjq9{t\"
.model flat,stdcall GBQn_(b9I
option casemap:none /tj$luls5
;Include 文件定义 ;;#`#v
include windows.inc _A'{la~k
include user32.inc {/ 2E*|W~I
includelib user32.lib ?9xu{B>6
include kernel32.inc L0"~[zB]N
includelib kernel32.lib (CE7j<j
;数据段 MKg,!TELe
.data t'(1I|7
szCaption db 'A MessageBox!',0 7x k|+!
szText db 'Hello,world!',0 /+[63=fl
;代码段 1@qgF
.code [Qj;/
start: ;rR/5d1!
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK %!|O.xxRR
invoke ExitProcess,NULL E^CiOTN
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> z]@6fM[
end start c$h9/H=~
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BEGIN { print "Hello, world!" } \?lz&<
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BASIC |FNCXlgZ
传统版BASIC(例如GWBASIC): `JURQ:l)3^
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10 PRINT "Hello, world!" r{K;|'d%h
20 END (f#b7O-Wn
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或在提示符输入: L%h/OD
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?"Hello, world!":END eV};9VJ$F
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现代版BASIC(例如Quick BASIC): >)**khuP7
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Print "Hello, world!" w0J|u'H
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以下的语句在Quick BASIC中同样有效: Zv!{{XO2;
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? "Hello,world!" K=\O5#F?3
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BCPL [V}, tO|
GET "LIBHDR" iK;opA"
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LET START () BE Lx[
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WRITES ("Hello, world!*N") |ys0`Vb=$
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Befunge @N.jB#nEb
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Brainfuck nk=$B(h
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#include <stdio.h> qUJ
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int main(void) aX6}6zubr
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printf("Hello, world!\n"); vqdX^m^PY
return 0; I PCGt{B~
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C++ 4'>1HW
#include <iostream> _lxco=qd=%
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int main() F5T3E?_
{ oF&l-DHp
std::cout << "Hello, world!" << std::endl; ,. EBOUW^
return 0; gFN9jM
} au@a8MP
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C++/CLI n# 7Pr/*0
int main() 5Rv+zQ#GR
{ gE7L L=x
System::Console::WriteLine("Hello, world!"); b1?xeG#
} =d`5f@'rl
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C# (C Sharp) Xl-e !
class HelloWorldApp :l\V'=%9'@
{ J$ut_N):N
public static void Main() *ZCn8m:-+
{ _2ef LjXQ
System.Console.WriteLine("Hello, world!"); $.E6S<(h
} @mQ:7-,~
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COBOL QO;4}rq
IDENTIFICATION DIVISION. 'Prxocxq
PROGRAM-ID. HELLO-WORLD. Ri*3ySyb
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ENVIRONMENT DIVISION. N:5[,O<m_
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DATA DIVISION. r?$?;%|C
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PROCEDURE DIVISION. d l]#
DISPLAY "Hello, world!". W7No ls{
STOP RUN. ki]ti={12
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Common Lisp $%k1fa C
(format t "Hello world!~%") $4=f+ "z
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DOS批处理 uKr1Z2
@echo off SI:ifR&T
echo "Hello, world!" 2 ][DZl
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