“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。 bjzx!OCpV
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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》。 Q7(eq0na
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以下是用不同语言写成的Hello World程序的几个例子:
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Ada l#xw.2bo
with Ada.Text_Io; use Ada.Text_Io; 0H+c4IW
procedure Hello is 50Ad,mn<
begin e8q4O|I_
Put_Line ("Hello, world!"); d.cCbr:
end Hello; L[]BzsIv
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汇编语言 WK4@:k
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x86 CPU,DOS,TASM N9`97;.X
MODEL SMALL PpFsp( )x
IDEAL WjOH/$(
STACK 100H c[:Wf<%|
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DATASEG HfZtL
HW DB 'Hello, world!$' @woC8X
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CODESEG GoD ?K C
MOV AX, @data jsZY{s=
MOV DS, AX rS,j;8D-
MOV DX, OFFSET HW 2d~LNy
MOV AH, 09H lsFfb'>
INT 21H qiU5{}
MOV AX, 4C00H q^]tyU!w
INT 21H =ybGb7?
END f3t.T=S
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x86 CPU,GNU/Linux,NASM l5HWZs^
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). )E~_rDTl
;Enter this into "hello.asm" then type: G_+Ph^
;"nasm -f elf hello.asm" 6(.H3bu
;"ld hello.o -o hello" :t5uDKZ_j)
;"./hello" n;qz^HXEJ
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section .data ;data section declaration $}4K`Iu
msg db 'Hello World!',0AH -#%X3F7/w
len equ $-msg ;string length |*E"G5WZM
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section .text ;code section declaration `M)E* G
global _start ;entry point (start of execution) \k4pK &b
_start: mov edx,len ;string length kO+s+ 55
mov ecx,msg ;string start XNlhu^jh
mov ebx,1 ;file handle: stdout ^W}MM8
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mov eax,4 ;sys_write 17i$8
int 80h ;kernel system call ~<eVl
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mov ebx,0 ;return value agW9Go_F[
mov eax,1 ;sys_exit Yw[{beo
int 80h ;kernel system call }!=U^A)
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x86 CPU,Windows,MASM32 gLx/w\l6
.386 |!xpYT:
.model flat,stdcall RM#fX^)=
option casemap:none Vrg3{@$
;Include 文件定义 f@x_#ov
include windows.inc Jh^8xI,`C
include user32.inc iN`6xkY
includelib user32.lib
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include kernel32.inc ~$ *`cO
includelib kernel32.lib 5v3RVaqZ
;数据段 niQcvnT4b
.data rg*^w!
szCaption db 'A MessageBox!',0 u>m'FECXj
szText db 'Hello,world!',0 ke^d8Z.
;代码段 j9>TTgy@
.code W6M jQ%f
start: ?CFoe$M
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK p>&S7M/9
invoke ExitProcess,NULL E#aZvE
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> MISE C[/
end start >"b[r
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BEGIN { print "Hello, world!" } r*]uR /Z$
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BASIC #?Wo <]i
传统版BASIC(例如GWBASIC): s|E%~j[9
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10 PRINT "Hello, world!" oAaf)?8
20 END HGb.656r
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或在提示符输入: W%WC(/hor
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?"Hello, world!":END `T`c@A
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现代版BASIC(例如Quick BASIC): d _uFY:
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Print "Hello, world!" 1MpX] j8C#
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以下的语句在Quick BASIC中同样有效: ,;c{9H
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? "Hello,world!" 8| Sba<d
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GET "LIBHDR" gn364U a
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LET START () BE uV!MW= )
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WRITES ("Hello, world!*N") 48;~bVr}
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Befunge roL}lM$
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#include <stdio.h> 'M47'{7T
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int main(void) wVlSjk
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printf("Hello, world!\n"); $,p.=j;P
return 0; C#ZmgR
} 3we.*\2$
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C++ .ruqRGe/
#include <iostream> F+lm [4n
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int main() ;bUJ+6f:
{ )6PJ*;p-
std::cout << "Hello, world!" << std::endl; ;a#}fX
return 0; XfD
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