“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。 M)S(:Il6Xx
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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》。 G8=2=/ !
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以下是用不同语言写成的Hello World程序的几个例子: ~C[p}MED
Ada m>yb}+
with Ada.Text_Io; use Ada.Text_Io; HVO
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procedure Hello is n%'M?o]DF
begin TNe,'S,%
Put_Line ("Hello, world!"); ZrY#B8
end Hello; p}q27<O*/
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汇编语言 |dIP &9
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x86 CPU,DOS,TASM e_'/4
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MODEL SMALL a&:1W83
IDEAL ;pe1tp
STACK 100H PdiP5S }/
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DATASEG =k.:XblEe[
HW DB 'Hello, world!$' EdGA#i3
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CODESEG +&hhj~I.
MOV AX, @data cUW>`F(S
MOV DS, AX _)|_KQQu
MOV DX, OFFSET HW BGM5pc (ei
MOV AH, 09H 1Q_ C
INT 21H ?88k`T'EI
MOV AX, 4C00H X3[gi`
INT 21H W\]bh'(
END ;R[ xo!
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x86 CPU,GNU/Linux,NASM 8A q [@i
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). 5)h#NkA\J
;Enter this into "hello.asm" then type: &L7u//
;"nasm -f elf hello.asm" #yNSQd
;"ld hello.o -o hello" Br/qOO:n$}
;"./hello" 6oTWW@
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section .data ;data section declaration *R9s0;&:
msg db 'Hello World!',0AH be&5vl
len equ $-msg ;string length L8OW@)|
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section .text ;code section declaration K:!){a[
global _start ;entry point (start of execution) Xge]3Ub
_start: mov edx,len ;string length =BD} +(3
mov ecx,msg ;string start %=p:\+`VI
mov ebx,1 ;file handle: stdout s
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mov eax,4 ;sys_write BR&T,x/d
int 80h ;kernel system call ]5(T{
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mov ebx,0 ;return value SCwAAE9s]
mov eax,1 ;sys_exit pe^hOzVv
int 80h ;kernel system call (EW<Ggi
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x86 CPU,Windows,MASM32 H CBZ*Z-
.386 FHztF$Z
.model flat,stdcall $db]b
option casemap:none 1D2Uomd(
;Include 文件定义 $;O-1# ]
include windows.inc #h,7dz.d
include user32.inc eAqSY s!1
includelib user32.lib E}Ir<\
include kernel32.inc X;2I'
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includelib kernel32.lib Za,MzKd=
;数据段 99QMMup
.data !LGnh
szCaption db 'A MessageBox!',0 ku2gFO
szText db 'Hello,world!',0 yf|,/{S
;代码段 !Cqm=q{K
.code Wp2W:JX:
start: \.0cA4)[$
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK m/{HZKh
invoke ExitProcess,NULL K6uZ4 m;
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 0[A4k:
end start {;:QY1QT
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BEGIN { print "Hello, world!" } MHF31/g\
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BASIC 3k%fY
传统版BASIC(例如GWBASIC): 0 QzUcr)3+
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10 PRINT "Hello, world!" B #o/3
20 END tKr.{#)
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或在提示符输入: 'eM90I%(
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?"Hello, world!":END =1!,A
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现代版BASIC(例如Quick BASIC): =D&xw2
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Print "Hello, world!" tx$i(
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以下的语句在Quick BASIC中同样有效: R,Gr{"H
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? "Hello,world!" /6?A#%hc
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GET "LIBHDR" 33R1<dRk
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LET START () BE UJ\[^/t
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WRITES ("Hello, world!*N") }JP0q
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Befunge Z`FEB0$
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#include <stdio.h> Ffvv8x
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int main(void) X2RM*y|
{ /0S2Omh
printf("Hello, world!\n");
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return 0; nZ4JI+Q)~
} $ 8"we
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C++ z;c~(o@4
#include <iostream> 7o+JQ&fF;
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int main() sIM^e
{ S!LLC{
std::cout << "Hello, world!" << std::endl; U<pGP
return 0; pCB^\M%*
} ]+U:8*
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C++/CLI tQrF A2F
int main() .C6wsmQ
{ k$ya.b<X/
System::Console::WriteLine("Hello, world!"); }3b3^f
} b I%Sq+"}
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C# (C Sharp) ^~p^N <
class HelloWorldApp {6y@;Fd
{ @;6I94Bp
public static void Main() 3Y;<Q>roT
{ 9_$i.@L1
System.Console.WriteLine("Hello, world!"); T%[&[8{8
} YK=o[nPmK
} bOB<m4
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COBOL m
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IDENTIFICATION DIVISION. lmsO
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PROGRAM-ID. HELLO-WORLD. ""Ub^:ucD
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ENVIRONMENT DIVISION. &N