“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。 HRw,D=
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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》。 d#z67Nl6
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以下是用不同语言写成的Hello World程序的几个例子: 3S5QqAm
Ada TOuFFR
with Ada.Text_Io; use Ada.Text_Io; =C:0='a
procedure Hello is R\+$^G}#6
begin >$"bwr}'4B
Put_Line ("Hello, world!"); /cjf 1Dc
end Hello; H+0 *
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汇编语言 j/Kw-h ,5"
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x86 CPU,DOS,TASM uuC/F_='B
MODEL SMALL iCEX|Tj;
IDEAL n+i}>3'A
STACK 100H H5aUZ=
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DATASEG A=3U4L
HW DB 'Hello, world!$' @LmUCP~
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CODESEG
:D/R
MOV AX, @data n_+Iw,a'm
MOV DS, AX <St`"H
MOV DX, OFFSET HW (HJ60Hj
MOV AH, 09H eX$Biv1N
INT 21H Sn+Yi
MOV AX, 4C00H 2Vi[qS^
INT 21H Z3/ zUtgs
END O,;SA
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x86 CPU,GNU/Linux,NASM AUq?<Vg\
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). /;>EyWW
;Enter this into "hello.asm" then type: {oZ]1Qf_
;"nasm -f elf hello.asm" PQs9@]w[
;"ld hello.o -o hello" 2KX *x_-
;"./hello" NSkI2>+P
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section .data ;data section declaration w7W-=\Hvh
msg db 'Hello World!',0AH b13>>'BMB
len equ $-msg ;string length #*`|}_6L
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section .text ;code section declaration :H87x?e[
global _start ;entry point (start of execution) := 8vy
_start: mov edx,len ;string length @GV^B'}*
mov ecx,msg ;string start 1hN!
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mov ebx,1 ;file handle: stdout Yk5kC0B
mov eax,4 ;sys_write lV1|\~?4
int 80h ;kernel system call MWuVV=rd8a
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mov ebx,0 ;return value $pKS['J0
mov eax,1 ;sys_exit BZBsE
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int 80h ;kernel system call JSL 3.J
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x86 CPU,Windows,MASM32 )Qc$UI8L
.386 *Zvw&y*
.model flat,stdcall WZr~Pb9
option casemap:none KXGs'D
;Include 文件定义 c2U>89LlZ
include windows.inc yqU++;6
include user32.inc I@B7uFj
includelib user32.lib bM'AD[
include kernel32.inc p)ONw"sb
includelib kernel32.lib ~DD/\V
;数据段 nZ*P:K t:
.data nGt8u4gcP
szCaption db 'A MessageBox!',0 w*}9;l
szText db 'Hello,world!',0 g,;MV7yE
;代码段 JB|I/\(A
.code tX_eN
start: (!b:
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 6IX!9I\sT
invoke ExitProcess,NULL 8+u8piG
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> gM*s/,;O"
end start Vh<`MS0X
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BEGIN { print "Hello, world!" } :U9R
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BASIC >&VL2xLy
传统版BASIC(例如GWBASIC): %L/=heBBd
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:@#H
10 PRINT "Hello, world!" V~=)#3]`[
20 END y AWDk0bx
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或在提示符输入: >4\xcL
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?"Hello, world!":END _=8+_OEk
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现代版BASIC(例如Quick BASIC): #^9;<@M
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Print "Hello, world!" )>fi={!=c
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以下的语句在Quick BASIC中同样有效: !r|X6`g
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? "Hello,world!" >=V+X"\Z
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GET "LIBHDR" zgqw*)C~
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LET START () BE TI>yi ^}
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WRITES ("Hello, world!*N") 1 XG-O
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Befunge L,6Y=?
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#include <stdio.h> "b
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int main(void) rg,63r
{ vNC0M:p,
printf("Hello, world!\n"); 9HX+sB
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return 0; {n]sRz
} +&OqJAu
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C++ ??Zmj:8E'
#include <iostream> X}(0y
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int main() 6mdnEmFM]
{ &r%*_pX
std::cout << "Hello, world!" << std::endl; ^{:jY, ?]
return 0; iIE(zw)H
} CeTr%j
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C++/CLI %z~U@Mka
int main() ^d80\PXz
{ #ja`+w}
System::Console::WriteLine("Hello, world!"); P0xLx
} !dY:S';~
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C# (C Sharp) 6>:~?gs
class HelloWorldApp |L;psK
{ xV#a(>-4
public static void Main() K;[%S
{ AxlFU~E4
System.Console.WriteLine("Hello, world!"); GYC&P]
} wkD:i 2E7
} (0W}e(D8
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COBOL -vHr1I<
IDENTIFICATION DIVISION. SFk#bh
PROGRAM-ID. HELLO-WORLD. Jv<