“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。 n! 5(Z5=
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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》。 eowwN>-2C
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以下是用不同语言写成的Hello World程序的几个例子: `G!HGzVx;j
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with Ada.Text_Io; use Ada.Text_Io; ++b[>};
procedure Hello is ]
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begin 5;KJ0N*-
Put_Line ("Hello, world!"); _s@PL59,
end Hello; $#f_p-N
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汇编语言 tm5{h{AM
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x86 CPU,DOS,TASM H'#06zP>5
MODEL SMALL Szt2 "AR
IDEAL t!3s@
STACK 100H lv/im/]v
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DATASEG G 3U[)("
HW DB 'Hello, world!$' $i+@vbU6
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CODESEG `,SL\\%u
MOV AX, @data
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MOV DS, AX B /uaRi%
MOV DX, OFFSET HW \k=dqWBr7
MOV AH, 09H C[%Qg=<
INT 21H |HT7m5tu4
MOV AX, 4C00H ,u>LAo0
INT 21H 9soEHG=P
END eZa7brC|
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x86 CPU,GNU/Linux,NASM 3m75mny
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). rM.Pc?Z
;Enter this into "hello.asm" then type: uz+WVmb
;"nasm -f elf hello.asm" A^FkU
;"ld hello.o -o hello" Tk[]l7R~
;"./hello" nuWQ3w
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section .data ;data section declaration Pl/Xh03E
msg db 'Hello World!',0AH 'V^M+ng
len equ $-msg ;string length v#{Nh8n
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section .text ;code section declaration }*rS g .
global _start ;entry point (start of execution) rfVQX<95=/
_start: mov edx,len ;string length 7+f6?
mov ecx,msg ;string start Kd 1=mC
mov ebx,1 ;file handle: stdout Q/3*65
mov eax,4 ;sys_write 6M&ajl`o
int 80h ;kernel system call 4vi?9MPz
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mov ebx,0 ;return value &&l
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mov eax,1 ;sys_exit dakHH@Q
int 80h ;kernel system call {+#{Cha
Dks n
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x86 CPU,Windows,MASM32 ?bM%#x{e
.386 =(hBgNH
.model flat,stdcall ]Xa]a}[uE
option casemap:none p5E
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;Include 文件定义 |MKR&%Na
include windows.inc FVl,
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include user32.inc e eN`T&cI
includelib user32.lib ]tu
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include kernel32.inc kM4z
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includelib kernel32.lib (*r2bm2FPO
;数据段 BMO,eQcB
.data `^{G`es
szCaption db 'A MessageBox!',0 ,=C ipL9]
szText db 'Hello,world!',0 |)To 0Z
;代码段 6R^F^<<
.code [sG`D-\P[
start: {J1rjrPo
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK KB~1]cYMp
invoke ExitProcess,NULL :_i1gY)
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I`XOvSO
end start 3(J>aQZuI
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BEGIN { print "Hello, world!" } H#GR*4x
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BASIC 0y<9JvN$9
传统版BASIC(例如GWBASIC): gmu.8
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10 PRINT "Hello, world!" )x[=}0C
20 END 1G`5FU
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或在提示符输入: |:(B I5&S
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?"Hello, world!":END 24InwR|^
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现代版BASIC(例如Quick BASIC): /:A239=+ ?
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Print "Hello, world!" uq:'`o-1
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以下的语句在Quick BASIC中同样有效: )r A\+XT7
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? "Hello,world!" Vx0Hq`_14
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BCPL H!y@.W{_
GET "LIBHDR" )`5-rm~*
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LET START () BE k]& I(VQ"
$( *X|%H-Q:H`
WRITES ("Hello, world!*N") q{,yas7}
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Befunge /KvpJ4
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+++++++++++++++.>.+++.------.--------.>+.>. i3Nt?FSN
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#include <stdio.h> U`'w{~"D%
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int main(void) WHF:>0B
{ 7
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printf("Hello, world!\n"); .^1=*j(;
return 0; :Ws3+OI'm3
} &jPsdv h
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C++ EA>$t\z
#include <iostream> <~8W>Y\m
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int main() \J\1i=a-=
{ %BHq2~J
std::cout << "Hello, world!" << std::endl; RMrt4:-DI
return 0; @fYA{-ZC
} en~(XE1
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C++/CLI Pr/&p0@aV
int main() {5z?5i ?D
{ !kKKJ~,;
System::Console::WriteLine("Hello, world!"); FRF}V@~
} p9sxA|O=y
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C# (C Sharp) O@Kr}8^,
class HelloWorldApp |)_<