“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。 t9T3e
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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》。 7xz~%xC.
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以下是用不同语言写成的Hello World程序的几个例子:
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Ada 7oaa)
with Ada.Text_Io; use Ada.Text_Io; !_0kn6S5
procedure Hello is LoZ8;VU
begin mw0#Dhyy1=
Put_Line ("Hello, world!"); jusP
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end Hello; h<;kj#qbb
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汇编语言 uMOm<kn
%SORs(4
x86 CPU,DOS,TASM 7
+A-S9P)
MODEL SMALL )P4#P2
IDEAL Vfew )]I
STACK 100H @gzm4
3l5rUjRwj
DATASEG kB_u U !G
HW DB 'Hello, world!$' ]=ar&1}J
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CODESEG 3&i8C,u]/O
MOV AX, @data kcT?<r
MOV DS, AX \%\b*OO
MOV DX, OFFSET HW 4
4%jz-m
MOV AH, 09H k#"Pv"
INT 21H Ij;=
MOV AX, 4C00H V"":_`1VW
INT 21H V#
Mw
END [P#^nyOh(
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x86 CPU,GNU/Linux,NASM :()(P9?
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). pcw!e_"+
;Enter this into "hello.asm" then type: 86d*
;"nasm -f elf hello.asm" |rJ_
;"ld hello.o -o hello" %4QCUc*lr
;"./hello" dLOUL9hf
N{Og; roGD
section .data ;data section declaration - bL
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msg db 'Hello World!',0AH +o&E)S}wP
len equ $-msg ;string length VU,\OOp
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section .text ;code section declaration <}'hkEh{d=
global _start ;entry point (start of execution) : sIZ+3
_start: mov edx,len ;string length o?A/
mov ecx,msg ;string start VuTH"br6
mov ebx,1 ;file handle: stdout K@xp!
mov eax,4 ;sys_write m(JFlO
int 80h ;kernel system call xo{f"8}^
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mov ebx,0 ;return value 'Rk~bAX
mov eax,1 ;sys_exit i[FcY2
int 80h ;kernel system call w7\:S>;(O"
G3QB Rh{
pJ7wd~wF*
x86 CPU,Windows,MASM32 B.fLgQK0
.386 L^PZ\OC
.model flat,stdcall q|m8G
option casemap:none 9R.IYnq
;Include 文件定义 (?-5p;
include windows.inc wqo2iRql
include user32.inc ?QO)b9
includelib user32.lib Re?sopg0r
include kernel32.inc 20 gPx;
includelib kernel32.lib YN4P
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;数据段 2 cfzLW(
.data QI>yi&t
szCaption db 'A MessageBox!',0 L;.6j*E*
szText db 'Hello,world!',0 X70 vDoW
;代码段 ~h -G
.code &*g5kh{
start:
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK u&l2s&i
invoke ExitProcess,NULL fX G+88:2
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> S|T:rc(~
end start ?!(/;RU1
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AWK )>at]mH
BEGIN { print "Hello, world!" } G}i\UXFE
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BASIC #V-qS/ q"
传统版BASIC(例如GWBASIC): 9,5v %HZ
ri~d Wx
10 PRINT "Hello, world!" xMg&>}5
20 END MnFem $ @
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或在提示符输入: OB3AZH$
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?"Hello, world!":END z2t;!]"'l
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现代版BASIC(例如Quick BASIC): h./cs'&
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Print "Hello, world!" (]j*)~=V
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以下的语句在Quick BASIC中同样有效: d T/*O8
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? "Hello,world!" G/(oQA
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BCPL &dvJg
GET "LIBHDR" 7=om /
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LET START () BE [.<