“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。 :,g]Om^
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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》。 67
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以下是用不同语言写成的Hello World程序的几个例子: L
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Ada !IA\c(c^
with Ada.Text_Io; use Ada.Text_Io; `xx3JQv[
procedure Hello is [J(b"c6
begin rs( e
Put_Line ("Hello, world!"); M"bG(a(6:
end Hello;
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汇编语言 ]>Gi_20*.
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x86 CPU,DOS,TASM B2'TRXIm1U
MODEL SMALL p\9}}t7n
IDEAL =8%*Rrj^
STACK 100H t`R{N1
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DATASEG 4>a(!ht
HW DB 'Hello, world!$' .N@+Ms3
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CODESEG 2eA.04F
MOV AX, @data {?2|rv)
MOV DS, AX 6,MQT,F
MOV DX, OFFSET HW #f HnM+
MOV AH, 09H 9q
2 vT^
INT 21H RA;/ ?l
MOV AX, 4C00H 6x=w-32+ y
INT 21H EWgJ"WTF
END 4*Gv0#dga
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x86 CPU,GNU/Linux,NASM E_DQ.!U!o
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). /fQ}Ls\
;Enter this into "hello.asm" then type: `wQs$!a
;"nasm -f elf hello.asm" BzkfB:wr
;"ld hello.o -o hello" G6}&k[d5%
;"./hello" iyd$_CJ z
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section .data ;data section declaration \E<Qi3W>*
msg db 'Hello World!',0AH 6vR6=@(`>
len equ $-msg ;string length ,UNk]vd
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section .text ;code section declaration Y:L[Iz95o
global _start ;entry point (start of execution) peT91b
_start: mov edx,len ;string length 8q9ATB-^>
mov ecx,msg ;string start JbS[(+o
mov ebx,1 ;file handle: stdout )S 4RR2Q>
mov eax,4 ;sys_write M\
int 80h ;kernel system call ,(zV~-:9
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mov ebx,0 ;return value *w O~RnP
mov eax,1 ;sys_exit $u'"C|>8
int 80h ;kernel system call `O%nDry
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x86 CPU,Windows,MASM32 kGo2R]Dd[
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.model flat,stdcall ]+3M\ ib
option casemap:none k ,+,,W
;Include 文件定义 6 U[VoUU
include windows.inc ]1W xa?
include user32.inc r|DIf28MIq
includelib user32.lib 9d-'%Q>+
include kernel32.inc <tZZ]Y]
includelib kernel32.lib 8.N`^Nj 1
;数据段 u)I\R\N
.data -3v\ c~
szCaption db 'A MessageBox!',0 P5oS 1iu*
szText db 'Hello,world!',0 6Aq]I$
;代码段 v;9(FLtL
.code 'TH[Db'`I
start: ;nQ=!
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK e98QT9
invoke ExitProcess,NULL 8IQ}%|lN
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end start `iM%R3&
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BEGIN { print "Hello, world!" } 8>#ZU]cG
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BASIC WPNw")t!
传统版BASIC(例如GWBASIC): WQ[nK5#
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10 PRINT "Hello, world!" R2a99# J
20 END K-#d1+P+
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或在提示符输入: e1h7~ j
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?"Hello, world!":END 9t)Hi qj
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现代版BASIC(例如Quick BASIC): w)zJ $l
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Print "Hello, world!" b3R(O|
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以下的语句在Quick BASIC中同样有效: [>54?4{|.
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? "Hello,world!" XWS]4MB+vm
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GET "LIBHDR" Bt}90#
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LET START () BE P4_B.5rrJ
$( #UL75
WRITES ("Hello, world!*N") W0 sLMHq
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Befunge nng|m
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C :E6*m\X!3
#include <stdio.h> J+IItO4%
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int main(void) )SJM:E
{ hDB(y4/
printf("Hello, world!\n"); 96~y\X@x
return 0; .uauSx/#4
} J~WT;s
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C++ (["kbPma
#include <iostream> /mz.HCs
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int main() TIiYic!_~
{ 8e>B>'nH
std::cout << "Hello, world!" << std::endl; Ds"%=
return 0; DmuQE~DV
} 5|~g2Zz{;
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C++/CLI PjBAf'
int main() Izu____
{ 1O0. CC,p
System::Console::WriteLine("Hello, world!"); O-V]I0
} ZKEoU!
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C# (C Sharp) P-2DBNB7
class HelloWorldApp tDL.+6/
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public static void Main() *s 4Ym
{ _J,rql@nG<
System.Console.WriteLine("Hello, world!"); tKUW
} h?/E />
} L:Rg3eo
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COBOL )C?H m^#
IDENTIFICATION DIVISION. 4_VgJ9@
PROGRAM-ID. HELLO-WORLD. |g}r
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ENVIRONMENT DIVISION. vS~tr sI
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