“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。 _`@Xy!Ye
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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》。 3]`qnSYBv
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以下是用不同语言写成的Hello World程序的几个例子: pmW6~%}*
Ada a&s"#j
with Ada.Text_Io; use Ada.Text_Io; QE#-A@c
procedure Hello is ( X
'FQ
begin B`Or#G3ph
Put_Line ("Hello, world!"); 1s}``1>
end Hello; =!S@tuY
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汇编语言 _WDBG
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x86 CPU,DOS,TASM <[3lV)~t
MODEL SMALL UQ$\
an'
IDEAL ;%rs{XO9
STACK 100H oX2DFgz
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DATASEG GrLM${G
HW DB 'Hello, world!$' c(Uj'uLc
U)`3[fo
CODESEG cB|Cy{%
MOV AX, @data 7:VEM;[d
MOV DS, AX
il IV}8
MOV DX, OFFSET HW !QQ<Ai!E
MOV AH, 09H k\Z;Cmh>
INT 21H neB.Wu~WH
MOV AX, 4C00H ^C:{z)"h
INT 21H 5gc:Y`7t
END ]O[+c*|w
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x86 CPU,GNU/Linux,NASM c;b[u:>~-
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). hHfe6P
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;Enter this into "hello.asm" then type: } `>J6y9
;"nasm -f elf hello.asm" ,WO%L~db
;"ld hello.o -o hello" S&
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;"./hello" =p,4=wo{
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section .data ;data section declaration 1&8j3"
msg db 'Hello World!',0AH l${Hgn+
len equ $-msg ;string length h=v[i!U-eY
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section .text ;code section declaration
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global _start ;entry point (start of execution) s]F?=yEp
_start: mov edx,len ;string length iJCY /*C}
mov ecx,msg ;string start vGPf`2/j.
mov ebx,1 ;file handle: stdout K'iS#i7
mov eax,4 ;sys_write bG5^h
int 80h ;kernel system call T.R>xd`9
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mov ebx,0 ;return value 8"?Vcw&
mov eax,1 ;sys_exit SgCqxFii
int 80h ;kernel system call q(ZB.
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x86 CPU,Windows,MASM32 k Z+ q
.386 zH=/.31Q
.model flat,stdcall -+
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option casemap:none =A0"0D{\
;Include 文件定义 @sB}q 6>
include windows.inc Qb6QXjN
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include user32.inc (6ohrM>Q
includelib user32.lib vk4C_8m
include kernel32.inc DJ1XNpm
includelib kernel32.lib b[{m>Fa+o#
;数据段 4hsPbUx9
.data Ad}-I%Ie
szCaption db 'A MessageBox!',0 .^[fG59
szText db 'Hello,world!',0 -(/2_&"
;代码段 3D?IG\3
.code :Bx+WW&P.i
start: dDv{9D,
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK B&%L`v2[
invoke ExitProcess,NULL f"ZqA'KB#
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> @MN}^umx`
end start ;uM34^
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BEGIN { print "Hello, world!" } S\!
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BASIC /gqqKUx
传统版BASIC(例如GWBASIC): ]Wy^VcqX
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10 PRINT "Hello, world!" =R8f)UQYx
20 END }
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或在提示符输入: _%A/ )
'\ph`Run
?"Hello, world!":END l1-4n*fU
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现代版BASIC(例如Quick BASIC): $:%*gY4~76
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Print "Hello, world!" ~&wXXVK3
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以下的语句在Quick BASIC中同样有效: `7u\
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? "Hello,world!" FX7Cjo#=R
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BCPL +l2e[P+qA
GET "LIBHDR" /p"U
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LET START () BE RE ![O
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WRITES ("Hello, world!*N") T$gkq>!j<E
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