“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!i]1x<
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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》。 dtTQY
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以下是用不同语言写成的Hello World程序的几个例子: a9}7K/Y=d
Ada h/?$~OD
with Ada.Text_Io; use Ada.Text_Io; I($0&Y\De
procedure Hello is 0g o{gUI
begin YHSdaocp
Put_Line ("Hello, world!"); FhpS#,Y$
end Hello; suiO%H^t
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汇编语言 Z8IY!d
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x86 CPU,DOS,TASM THEpW{.E
MODEL SMALL ' d' Dlg
IDEAL 0@7%
STACK 100H }M7{~ov#s
v P;
DATASEG A6eIf
HW DB 'Hello, world!$' O*jTrZ(k
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CODESEG rr~O6Db
MOV AX, @data 5 6w6=Is
MOV DS, AX NhG?@N
MOV DX, OFFSET HW 8vRQ_
MOV AH, 09H -]n\|U<
INT 21H t}6QU
MOV AX, 4C00H ^__';! e
INT 21H N)CM^$(T|
END 2 8>
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lZ gX{
x86 CPU,GNU/Linux,NASM Z{XF!pS%H
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ~/C9VR&
;Enter this into "hello.asm" then type: 6Uh_&?\%
;"nasm -f elf hello.asm" DL<b)# h#
;"ld hello.o -o hello" ,!
b9
;"./hello" #w]UP#^io
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section .data ;data section declaration kZ5;Fe\*
msg db 'Hello World!',0AH S,0h
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len equ $-msg ;string length uE E;~`G
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section .text ;code section declaration }B1f_T
global _start ;entry point (start of execution) D`c&Q4$:
_start: mov edx,len ;string length o{]2W `0r
mov ecx,msg ;string start Y[sBVz'j5
mov ebx,1 ;file handle: stdout +-2W{lX
mov eax,4 ;sys_write '<=77yDg
int 80h ;kernel system call )>"|<h.2]
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mov ebx,0 ;return value "
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mov eax,1 ;sys_exit 7!sR%h5p
int 80h ;kernel system call QzLE9
|-l9 Z
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x86 CPU,Windows,MASM32 .o#A(3&n
.386
nQ +$
.model flat,stdcall v]h^0WU
option casemap:none +khVi}
;Include 文件定义 .D3k(zZ
include windows.inc '><I|c}
include user32.inc N++ ;}j
includelib user32.lib E%%iVFPX
include kernel32.inc utzf7?nIS
includelib kernel32.lib WBN3:Y7
;数据段 @6"+x
.data /$NR@56
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szCaption db 'A MessageBox!',0 HkPdqNC&
szText db 'Hello,world!',0 n:"0mWnL$y
;代码段 L_`D
.code .+)
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start: 7TW&=(
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK e+~@"^|
invoke ExitProcess,NULL q:cCk#ra
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> -JfqY?Ue_2
end start `c)[aP{vN
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AWK FJD;LpW
BEGIN { print "Hello, world!" } 'ws@I?!r
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BASIC JA09 o(
传统版BASIC(例如GWBASIC): :JXGgl<y
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10 PRINT "Hello, world!" f
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20 END hG2WxYk
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或在提示符输入: 5fq4[a
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?"Hello, world!":END P"{yV?CNg
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现代版BASIC(例如Quick BASIC): RF }R~m9]
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Print "Hello, world!" "_0sW3rG
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以下的语句在Quick BASIC中同样有效: Z&|Dp*Z
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? "Hello,world!" 3Yf~5csY
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BCPL Nd
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GET "LIBHDR" 5SEGV|%
LEg ?/!LIT
LET START () BE kq*IC&y
$( ~^/BAc
WRITES ("Hello, world!*N") KBDNK_7A
$) 2WS Wfh
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Befunge $}EI3a
"!dlrow olleH">v >~O/ZDu/@
, /%F5u}eW
^_@ 0
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+++++++++++++++.>.+++.------.--------.>+.>. O[8wF86R
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C =, 64Qbau
#include <stdio.h> pmiC|F83!8
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int main(void) A
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{ z(#CO<C.t
printf("Hello, world!\n"); _ xM}*_<VP
return 0; Lh-+i
} h
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C++ ll
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#include <iostream> a|ZJzuqo
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int main() L*6>S_l[
{ ;ykX]5jGh
std::cout << "Hello, world!" << std::endl; bSW~hyI w
return 0; 8w ]'U
} 2]5ux!Lqln
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C++/CLI :cA8[!
int main() Hv*+HUc(:
{ ;73{n*a$
System::Console::WriteLine("Hello, world!"); ft$
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} n{!=gR.v.
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C# (C Sharp) i'`>YX
class HelloWorldApp z>HM$n`YD
{ ^qtJcMK+hq
public static void Main() [M?&JA