“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。 4~J1pcBno%
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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》。 FWx*&y~$
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以下是用不同语言写成的Hello World程序的几个例子: .J!
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Ada jjlCi<9CQ^
with Ada.Text_Io; use Ada.Text_Io; 4)S?Y"Bs
procedure Hello is "VOWV3Z
begin V,%5
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Put_Line ("Hello, world!"); pHbguoH,
end Hello; o\Vt $
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汇编语言 i /U{dzZ
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x86 CPU,DOS,TASM ^oZs&+z
MODEL SMALL IpVwn Nj!}
IDEAL q|_ 5@Ly
STACK 100H a-A4xL.gm
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DATASEG lfG&V +S1
HW DB 'Hello, world!$' 0a-:x4
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CODESEG @G-k]IWi
MOV AX, @data K%#C+`Ij
MOV DS, AX 3cQmxp2*
MOV DX, OFFSET HW L&k$4,Z9
MOV AH, 09H m!>'}z
INT 21H #6Ph"\G/
MOV AX, 4C00H KTREOOu .t
INT 21H tm#y`1-
END G+yz8@
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x86 CPU,GNU/Linux,NASM q\=[v
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). +f~3FXM
;Enter this into "hello.asm" then type: 3W
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;"nasm -f elf hello.asm" @WE$%dr
;"ld hello.o -o hello" /JYi^rZ
;"./hello" /{}
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section .data ;data section declaration _!Q\Xn
msg db 'Hello World!',0AH gVWLY;c 3}
len equ $-msg ;string length U9OF0=g
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section .text ;code section declaration ! (tJZ5
global _start ;entry point (start of execution) N%i<DsK.u6
_start: mov edx,len ;string length No+zw% l0E
mov ecx,msg ;string start =l_"M
mov ebx,1 ;file handle: stdout O&%T_Zk@@
mov eax,4 ;sys_write jC7XdYp
int 80h ;kernel system call wAPdu y[
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mov ebx,0 ;return value 8h2?Q
mov eax,1 ;sys_exit 3E9j%sYk
int 80h ;kernel system call l"#,O$x"#@
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x86 CPU,Windows,MASM32 BW[K/l~"$:
.386 YO61 pZY
.model flat,stdcall RT9@&5>il
option casemap:none mer{Jys
;Include 文件定义 ,|/$|$'
include windows.inc 0:p#%Nvg
include user32.inc -OxHQ
includelib user32.lib 6Rj
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include kernel32.inc &n
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includelib kernel32.lib mYvm_t9
;数据段 pj6Cvq4bD
.data 03T.Owd
szCaption db 'A MessageBox!',0 RB!E>]
szText db 'Hello,world!',0 e^TF.D?RS
;代码段 .S;/v--F
.code 4YC`dpO'
start: NM ]/OKs'H
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK g(^l>niF:
invoke ExitProcess,NULL &2J|v#$F
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end start D?R z|
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BEGIN { print "Hello, world!" } FqfeH_-U
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BASIC 2NM}u\%c/
传统版BASIC(例如GWBASIC): 5l#)tX.by
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10 PRINT "Hello, world!" Wu(GC]lTG
20 END %k_JLddlW
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或在提示符输入: -|5&3HVz
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?"Hello, world!":END "d'@IN
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现代版BASIC(例如Quick BASIC): jsj" W&J
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Print "Hello, world!" 4Bz~_
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以下的语句在Quick BASIC中同样有效: "F&uk~ b$
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? "Hello,world!" {sLh=iK
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GET "LIBHDR" c72/e7gV
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LET START () BE (+@H !>r$$
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WRITES ("Hello, world!*N") iiu\_ a=0b
$) ty ~U~
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Befunge I?=Q
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C qhogcAvE
#include <stdio.h> (g 8K?Q
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int main(void) 'vXrA
{ `Tab'7
printf("Hello, world!\n"); (t <Um
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return 0; >q`G?9d2
} bz@4obRqf
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C++ M$w^g8F27H
#include <iostream> +!X^E9ra
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int main() ex-`+cF
{ )ZT&V