“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。 %JA^b5''
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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》。 EW]8k@&g
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以下是用不同语言写成的Hello World程序的几个例子: w/(2fU (
Ada ({C|(v9C7
with Ada.Text_Io; use Ada.Text_Io; Gh%dVP9B@P
procedure Hello is $O\]cQD`u
begin brF) %x`
Put_Line ("Hello, world!"); 2Aa
end Hello; [>QzT"=
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汇编语言 3%N!omAe
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x86 CPU,DOS,TASM @_;vE(!5
MODEL SMALL +]C|y ,r
IDEAL +6<g N[
STACK 100H 2>Kn'p
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DATASEG 09Z\F^*$F
HW DB 'Hello, world!$' yfAh=
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CODESEG XJ7mvLM;
MOV AX, @data )OQih+#?W
MOV DS, AX <a
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MOV DX, OFFSET HW a
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MOV AH, 09H PV/ hnVUl
INT 21H Iw</X}#\
MOV AX, 4C00H l9NET
INT 21H k3e?:t 9
END iN+&7#x;/
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x86 CPU,GNU/Linux,NASM qI1JM =
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). X]Ma:1+
;Enter this into "hello.asm" then type: 1jj.oa]
;"nasm -f elf hello.asm" QPz3IK%
;"ld hello.o -o hello" hKQg:30<
;"./hello" (#r>v
h (
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section .data ;data section declaration f9b[0L
msg db 'Hello World!',0AH Lq5Eu$;r
len equ $-msg ;string length 6vZ.CUK9
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section .text ;code section declaration !
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global _start ;entry point (start of execution) P%kJq^&
_start: mov edx,len ;string length l Gy`{E|
mov ecx,msg ;string start @ u2P&|:{
mov ebx,1 ;file handle: stdout >l0D,-O]m
mov eax,4 ;sys_write N51RBA
int 80h ;kernel system call L ]Dl}z
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mov ebx,0 ;return value P}$DCD<$U
mov eax,1 ;sys_exit Hd0?}w\
int 80h ;kernel system call ZHOh(
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x86 CPU,Windows,MASM32 H7R6Ljd?&S
.386 W .bJ.hO*
.model flat,stdcall JnZlz?}^
option casemap:none SRpPLY{:F
;Include 文件定义 ~;B@ {kFY)
include windows.inc Qo \;)
include user32.inc %oN5 jt
includelib user32.lib !TdbD56
include kernel32.inc 9~C$C
includelib kernel32.lib IAa}F!6Q1
;数据段 N\WEp?%~
.data /?g:`NT
szCaption db 'A MessageBox!',0 j692M.A
szText db 'Hello,world!',0 b#z{["%Zp
;代码段 S2EeC&-AR
.code d#]XyN>
start: h oL"K
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 8 ,<F102(
invoke ExitProcess,NULL dAj;g9N/h
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> j_2yTz"G-
end start 6P6Pl&
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BEGIN { print "Hello, world!" } h
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BASIC [#Y7iN&
传统版BASIC(例如GWBASIC): y&$v@]t1
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10 PRINT "Hello, world!" (lBwkQNQGd
20 END mUW4d3tE
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或在提示符输入: y.'5*08S0
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?"Hello, world!":END =u#xPI0:
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现代版BASIC(例如Quick BASIC): ^dF?MQA<@
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Print "Hello, world!" -*I Dzm
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以下的语句在Quick BASIC中同样有效: xJ18M@"j
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? "Hello,world!" Y={_o!9
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GET "LIBHDR" o2C{V1nB
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LET START () BE A=S_5y
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WRITES ("Hello, world!*N") hkhk,bhI
$) sD[G?X
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+++++++++++++++.>.+++.------.--------.>+.>. 5#|f:M]Bo|
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C dP0%<Q|
#include <stdio.h> i^2yq&uT(
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int main(void) sfv{z!mo
{ 8 )W{C>
printf("Hello, world!\n"); $T)EJe
return 0; gW[(gf.oo
} {b<;?Du s^
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C++ ># {,(8\
#include <iostream> |V 3AA
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int main() _.ny<r:g
{ -/k;VT|
std::cout << "Hello, world!" << std::endl; YhVV~bvz*
return 0; _Py/,Ks.q
} 0gs0[@
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int main() I(cy<ey+e
{ RW#&