“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。 d u.HSXK
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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》。 mV6#!_"
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以下是用不同语言写成的Hello World程序的几个例子: R'*<A3^
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with Ada.Text_Io; use Ada.Text_Io; ??%)|nj.
procedure Hello is X4d Xm>*?=
begin pY^pTWs(
Put_Line ("Hello, world!"); ((Vj]I%
;
end Hello; _oQtk^fp
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汇编语言 [NQmL=l
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x86 CPU,DOS,TASM L_tjcfVo
MODEL SMALL z[WC7hvU
IDEAL 5."5IjZu
STACK 100H P#AAOSlLV
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DATASEG Vh 2Bz
HW DB 'Hello, world!$' [yO=S0 e
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CODESEG x^zdTMNhw
MOV AX, @data N YCj; ,V
MOV DS, AX Xy:Gj,@
MOV DX, OFFSET HW ~RcNZ\2y
MOV AH, 09H 9OPK4-
INT 21H 4uFIpS|rq
MOV AX, 4C00H K|`+C1!
INT 21H :9(3h"
END #]?tY}~
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x86 CPU,GNU/Linux,NASM LEWa6'0rq
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). )V=0IZi
;Enter this into "hello.asm" then type: - oU@D
;"nasm -f elf hello.asm" I|H,)!Z
;"ld hello.o -o hello" ,Qat
;"./hello" [.{^" <Z<
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section .data ;data section declaration lco~X DI
msg db 'Hello World!',0AH Q6u{@$(/N
len equ $-msg ;string length U9x4j_.q
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section .text ;code section declaration &j3`
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global _start ;entry point (start of execution) a|U}Ammr
_start: mov edx,len ;string length M|ms$1x
mov ecx,msg ;string start VF\{ra;
mov ebx,1 ;file handle: stdout YbzM6u2
mov eax,4 ;sys_write 7LG+$LEz
int 80h ;kernel system call tL1P<1j_
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mov ebx,0 ;return value WPtMds4
mov eax,1 ;sys_exit )Ea8{m!
int 80h ;kernel system call 2@sr:,\1
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x86 CPU,Windows,MASM32 Tj&'KF8?L
.386 >jv\Qh
.model flat,stdcall ,6DD=w 0r
option casemap:none N ,+(>?yE
;Include 文件定义 8qN"3 Et
include windows.inc $Y6 3!*
include user32.inc lw s(/a*c
includelib user32.lib eI0F!Yon
include kernel32.inc w(Gz({l+
includelib kernel32.lib '[Xl>Z[
;数据段 %Z7%jma
.data kffZElV
szCaption db 'A MessageBox!',0 <~N%W#z/
szText db 'Hello,world!',0 c8<xFvYG
;代码段 G)8ChnJa!m
.code pr$~8e=c
start: sXiv,
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK @ ICbKg:
invoke ExitProcess,NULL Z^*NnL.'
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> %kq ^]S2O
end start
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BEGIN { print "Hello, world!" } SRItE\"Xe
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BASIC =T4u":#N;
传统版BASIC(例如GWBASIC): @(>XOj?+
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10 PRINT "Hello, world!" p,;mYm s
20 END bK4&=#Zh
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或在提示符输入: U(*yL-
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?"Hello, world!":END ybE[B}pOeZ
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现代版BASIC(例如Quick BASIC): Bc<n2 C0
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Print "Hello, world!" ('4wXD]C
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以下的语句在Quick BASIC中同样有效: AF$\WWrB
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? "Hello,world!" kiX%3(
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BCPL mxp Y&Y
GET "LIBHDR" =cn~BnowY
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LET START () BE wf9z"B
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WRITES ("Hello, world!*N") Qn|+eLY
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Befunge af'@h:
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Brainfuck ;`UecLb#
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C $$1qF"GF
#include <stdio.h> XUmR{A
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int main(void) cdTsRS;E
{ 926Tl
printf("Hello, world!\n"); ~uj;qq
return 0; ir[jCea,
} Xy7Z38G
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C++ L
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#include <iostream> (OmH~lSO.
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int main() L?RF;jf
{ JTW)*q9a
std::cout << "Hello, world!" << std::endl; J4aBPq`
return 0; ;>"nn
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} W?Xiz TW
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C++/CLI #T3h}=
int main() IL!=mZ>2O
{ Q+$Tt7/
System::Console::WriteLine("Hello, world!"); lE5v-z? &|
} Ph,-sR
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C# (C Sharp) K@:m/Z}|4
class HelloWorldApp z#Nl@NO&
{ N "Wqy
public static void Main() >e&