“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。 o&Xp%}TI
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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》。 otR7E+*3
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以下是用不同语言写成的Hello World程序的几个例子: $Z#~wsw
Ada K6p\ >J
with Ada.Text_Io; use Ada.Text_Io; ZF[W<Q
procedure Hello is "I/05k K
begin l_Lz9k
Put_Line ("Hello, world!"); 9=MNuV9/s
end Hello; l!88|~
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汇编语言 jsE8=zZs
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x86 CPU,DOS,TASM 04Zdg:[3-!
MODEL SMALL NeY*l
IDEAL \#:
W
STACK 100H B+Qf?1f
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DATASEG l%"DeRp,/
HW DB 'Hello, world!$' uD=Kar
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CODESEG 6)uBUM;i
MOV AX, @data )Su>8f[?e
MOV DS, AX MSS[-}
MOV DX, OFFSET HW D r(0w{5
MOV AH, 09H Dnw^H.
INT 21H
%lnkD5
MOV AX, 4C00H YFm%W@
INT 21H :k1?I'q%
END h#r~2\q4ei
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x86 CPU,GNU/Linux,NASM j;`Q82V\
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). LP#wE~K"b
;Enter this into "hello.asm" then type: \[3~*eX6
;"nasm -f elf hello.asm" 2.%)OC!q&5
;"ld hello.o -o hello" y7F
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;"./hello" QNx]8r
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section .data ;data section declaration vlkwWm
msg db 'Hello World!',0AH ZcXAqep8'
len equ $-msg ;string length 5eff3qrH{
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section .text ;code section declaration d9S/_iCI
global _start ;entry point (start of execution) ny13+Q`^
_start: mov edx,len ;string length .S54:vs
mov ecx,msg ;string start ]?VVwft
mov ebx,1 ;file handle: stdout ~#)hqU'
mov eax,4 ;sys_write HfSx*@\s
int 80h ;kernel system call b=lJ`|
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mov ebx,0 ;return value &f.|MNz;
mov eax,1 ;sys_exit 3Y38lP:>h
int 80h ;kernel system call rq3f/_#L!O
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x86 CPU,Windows,MASM32 ;9z|rWsF
.386 *G.vY#h
.model flat,stdcall 7zw0g~+
option casemap:none /";tkad^
;Include 文件定义 p}!i_P
include windows.inc ASbIc"S6
include user32.inc DW7E ]o
includelib user32.lib doL-G?8B
include kernel32.inc 5wV J.B~s
includelib kernel32.lib sF!#*Y
;数据段 pL{oVk#,
.data iRrUIWx
szCaption db 'A MessageBox!',0 vGv<WEE
szText db 'Hello,world!',0 ]4H)GWHKg
;代码段 _|M8xI
.code \o[][R#D
start: c_vGr55
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK ,A` |jF
invoke ExitProcess,NULL EF
:g0$
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> !j'LZ7
end start 5T#v&
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AWK A^z{n/DiL
BEGIN { print "Hello, world!" } Py
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BASIC [Kc ?<3W
传统版BASIC(例如GWBASIC): j<kW+Iio
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10 PRINT "Hello, world!" B%\&Q@X
20 END _\\Al v.
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或在提示符输入: X,w X)9]J
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?"Hello, world!":END W Csf_1
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现代版BASIC(例如Quick BASIC): e7GYz7
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Print "Hello, world!" 4x)vy-y
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以下的语句在Quick BASIC中同样有效: MuD
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? "Hello,world!" sA?8i:]O:
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BCPL d?X,od6
GET "LIBHDR" fr(Ja;
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LET START () BE $(D>v!dp
$( 0~U%csPHt
WRITES ("Hello, world!*N") =?C <