“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。 vD4*&|8T#
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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》。 [ hsds\
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以下是用不同语言写成的Hello World程序的几个例子: f
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Ada !9x}
with Ada.Text_Io; use Ada.Text_Io; JtZ7ti
procedure Hello is JI5Dy>u:
begin V8(-
Put_Line ("Hello, world!"); =H~j,K
end Hello; >3bCTE
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汇编语言 $!DpjN
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x86 CPU,DOS,TASM v0y(58Rz.
MODEL SMALL &{i{XcqH'
IDEAL _*zt=zn>
STACK 100H KSL`W2}
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DATASEG 4\i[m:e=@
HW DB 'Hello, world!$' snJ129}A
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CODESEG m kexc~l
MOV AX, @data W8<%[-r
MOV DS, AX _G0x3
MOV DX, OFFSET HW s @C}P
MOV AH, 09H `{Ul!
INT 21H \Cj B1]I
MOV AX, 4C00H 8_F1AU? u
INT 21H p#Bi>/C6
END A=4OWV?
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x86 CPU,GNU/Linux,NASM BuwY3F\-O
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). Ls%MGs9PI
;Enter this into "hello.asm" then type: 6nQq
;"nasm -f elf hello.asm" n| ;Im&,
;"ld hello.o -o hello" f5r0\7y0
;"./hello" 1"g<0
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section .data ;data section declaration r3Ykz%6
msg db 'Hello World!',0AH yjAL\U7`T
len equ $-msg ;string length c|%6e(g"L
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section .text ;code section declaration 3u;oQ5<(v
global _start ;entry point (start of execution) ys~x$
_start: mov edx,len ;string length ]oxZ77ciL
mov ecx,msg ;string start ..qCPlK;
mov ebx,1 ;file handle: stdout c:0L+OF}xY
mov eax,4 ;sys_write weQ_*<5%
int 80h ;kernel system call (?c-iKGc
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mov ebx,0 ;return value N0lC0
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mov eax,1 ;sys_exit :0ep(<|;
int 80h ;kernel system call . ^u,.
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x86 CPU,Windows,MASM32 ?0SEMmp`H
.386 H. c7Nle
.model flat,stdcall g*Phv|kI
option casemap:none ^"g~-
;Include 文件定义 _+,TT['57s
include windows.inc +%&yJ4-
include user32.inc <UI
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includelib user32.lib Kgv T"s.
include kernel32.inc JLYi]nZ
includelib kernel32.lib g\U-VZ6;p
;数据段 +#By*;BJ
.data /bEAK-
szCaption db 'A MessageBox!',0 r/sNrB1U"y
szText db 'Hello,world!',0 :LTN!jj
;代码段 $N\Ja*g
.code <Qq*p
start: fV:83|eQ
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK
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invoke ExitProcess,NULL 4=.so~9odX
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> *dF>_F
end start OH"XrCX7n
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BEGIN { print "Hello, world!" } 6Iw\c
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BASIC |M_UQQAB|
传统版BASIC(例如GWBASIC): 8D].MI^
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10 PRINT "Hello, world!" iOdpM{~*
20 END fQ98(+6
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或在提示符输入: V+~Nalm O
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?"Hello, world!":END ap~^Ty<>
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现代版BASIC(例如Quick BASIC): GF
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Print "Hello, world!" y?0nI<}}HK
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以下的语句在Quick BASIC中同样有效: f-2c0Bi
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? "Hello,world!" 80;(Gt@<"
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BCPL <t,x RBk
GET "LIBHDR" ZB&6<uw
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LET START () BE L+QLLcS~EM
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WRITES ("Hello, world!*N") Ev P{p
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Befunge X7wKy(g
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++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< +MLVbK
+++++++++++++++.>.+++.------.--------.>+.>. gNhQD*+>{
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#include <stdio.h> >*n0n!vF
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int main(void) gO^gxJ'0t
{ =ruao'A
printf("Hello, world!\n"); 9C\Fq-
return 0; iIogx8[
} _y3Xb`0a
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C++
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#include <iostream> e$pV%5=
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int main() Gbw2E&a