“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。 W%>T{}4
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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》。 }8tF.QjR|
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以下是用不同语言写成的Hello World程序的几个例子: 7ihcjyXB
Ada ^@* `vz^_
with Ada.Text_Io; use Ada.Text_Io; S:j{R^$k
procedure Hello is "JSIn"/
begin ,M{G
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Put_Line ("Hello, world!"); g@!U^mr*3
end Hello; <`pNdy4
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汇编语言 Xrb7.Y0d
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x86 CPU,DOS,TASM ^PNDxtd|v
MODEL SMALL k5aB|xo
IDEAL @z ",1^I
STACK 100H J";N^OR{A%
hQj@D\}
DATASEG Gl'G;F$Y-
HW DB 'Hello, world!$' W/BPf{U
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CODESEG /.7RWy`
MOV AX, @data Pp!4Ak4TT9
MOV DS, AX ZtO$kK%q;
MOV DX, OFFSET HW 8k-]u3
MOV AH, 09H e7"T37
INT 21H X$6NJ(2G
MOV AX, 4C00H !Ea >tQ|
INT 21H ^4$4x
END Wx]Xa]-
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x86 CPU,GNU/Linux,NASM ./XX
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). SZe55mK `
;Enter this into "hello.asm" then type: ;@qS#7SRB
;"nasm -f elf hello.asm" _"Bj`5S
;"ld hello.o -o hello" M#o.O?.`
;"./hello" J78.-J5 j0
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section .data ;data section declaration Wj,s/Yr:
msg db 'Hello World!',0AH R&Nl!QTJj
len equ $-msg ;string length d]s^?=gM
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section .text ;code section declaration ~;CNWJtcf(
global _start ;entry point (start of execution) lj}3TbM
_start: mov edx,len ;string length b/a\{
mov ecx,msg ;string start }#D=Rf?2\P
mov ebx,1 ;file handle: stdout ;dUKFdKH}
mov eax,4 ;sys_write nk tGO
int 80h ;kernel system call b)'CP Cu*
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mov ebx,0 ;return value Ga02Zk
mov eax,1 ;sys_exit #<[&Lw
int 80h ;kernel system call !0?o3,of-
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x86 CPU,Windows,MASM32 @ U=y}vi8
.386 ZcjLv
.model flat,stdcall &,G2<2_ b
option casemap:none ZH\t0YhrVe
;Include 文件定义 \;N+PE
include windows.inc o+{,>t
include user32.inc AA[1[
includelib user32.lib Jfr'OD2$ %
include kernel32.inc WT,I~'r=S
includelib kernel32.lib 5n2!Y\
;数据段 C lf;+G0
.data w*XM*yJHU
szCaption db 'A MessageBox!',0 &6OY^6<
szText db 'Hello,world!',0 Q/?`);
;代码段 &v .S_Ym
.code C5 ILVQ
start: ~{lb`M^]h
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK BH {z]a
invoke ExitProcess,NULL ;iX~3[]
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 2fr%_GNu
end start \u`P(fI!K%
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BEGIN { print "Hello, world!" } -&7?!<f
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BASIC w>f.@luO4
传统版BASIC(例如GWBASIC): 0=HB!{@
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10 PRINT "Hello, world!" 'e]>lRZ
20 END 8[J%TWq%9
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或在提示符输入: `Z,WKus
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?"Hello, world!":END of*T,MUI
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现代版BASIC(例如Quick BASIC): g^A^@~M
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Print "Hello, world!" K
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以下的语句在Quick BASIC中同样有效: 6w &<j&V
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? "Hello,world!" +3.9)w
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BCPL 7WmLC
GET "LIBHDR" H][TH2H1
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LET START () BE `uPO+2
$( xL_QTj
WRITES ("Hello, world!*N") wry`2_c
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Befunge Ag0w8F
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Brainfuck X~VI} dJ
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+++++++++++++++.>.+++.------.--------.>+.>. =t_+ajY%
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C :a&M]+!
#include <stdio.h> ?qs LR
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int main(void) y g(Na
{ g0biw?
printf("Hello, world!\n"); fsOlg9
return 0; l,Q`;v5|
} 31^/9lb
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C++
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#include <iostream> YkF LNCg4}
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int main() _hV34:1F
{ _)vX_gCi
std::cout << "Hello, world!" << std::endl; ]vcT2lr]
return 0; NaoOgZ?
} _`=qc/-0
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C++/CLI $9\8?gS
int main() HHw&BN