“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。 \WcB9
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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》。 I|Z/`9T
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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 6nc0=~='$
with Ada.Text_Io; use Ada.Text_Io; FW_G\W.
procedure Hello is Vz'HM$
begin UkZ\cc}aC/
Put_Line ("Hello, world!"); z/weit
end Hello; _$8{;1$T?
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汇编语言 m*`cuSU|o
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x86 CPU,DOS,TASM i =-8@
MODEL SMALL eI0F!Yon
IDEAL MO-!TZ+6
STACK 100H _AprkI_
mGO>""<:
DATASEG `YU=~xQ
HW DB 'Hello, world!$' 2yvVeo&3
#\LZ;&T'N
CODESEG Nl
{7
MOV AX, @data U~wjR"='
MOV DS, AX JIMWMk;ot
MOV DX, OFFSET HW b_|u<
MOV AH, 09H {M[~E|@D
INT 21H ^Z#@3=
MOV AX, 4C00H :&9TW]*g
INT 21H Ge^Qar
END @ ICbKg:
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x86 CPU,GNU/Linux,NASM Y87XLvig}
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). {c@G$
;Enter this into "hello.asm" then type: @UO}W_0ZD
;"nasm -f elf hello.asm" }"n7~|
;"ld hello.o -o hello" 9KyZEH;pY
;"./hello" BRa{\R^I
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section .data ;data section declaration +bUW!$G
msg db 'Hello World!',0AH -TTs.O8P|<
len equ $-msg ;string length x#mtS-sw2Q
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section .text ;code section declaration vr 4O8#
global _start ;entry point (start of execution) ;%WdvnW
_start: mov edx,len ;string length .TJ">?
mov ecx,msg ;string start ddoFaQ8
mov ebx,1 ;file handle: stdout 5,R`@&K3D
mov eax,4 ;sys_write NF mc>0-
int 80h ;kernel system call p,;mYm s
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mov ebx,0 ;return value L,$3Yj
mov eax,1 ;sys_exit O |WbFf
int 80h ;kernel system call pv&^D,H,
_f|/*.
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x86 CPU,Windows,MASM32 `eC+% O
.386 +ubnx{VC
.model flat,stdcall jgq{pZ#E
option casemap:none ?mU\
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;Include 文件定义 3;l "=#5
include windows.inc Yb6q))Y
include user32.inc /zT`Y=1
includelib user32.lib ,Kw5Ro`I:
include kernel32.inc Sy
includelib kernel32.lib . :a<2sp6
;数据段 TBnvV 5_
.data ;&
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szCaption db 'A MessageBox!',0 'M N1A;IJ
szText db 'Hello,world!',0 +/y]h0aa
;代码段 A=X-;N#
.code )xt4Wk/
start: -zKxf@"
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK Q'K$L9q
invoke ExitProcess,NULL Ly>OLI0x_
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> j5^-.sEEw
end start b#a@rh
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BEGIN { print "Hello, world!" } .6m_>Y6
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BASIC rwgsXS8W6
传统版BASIC(例如GWBASIC): ,Sg33N?
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10 PRINT "Hello, world!" bX2"89{
20 END 74f9|~%
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或在提示符输入: *_"u)<J
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?"Hello, world!":END {G*OR,HN
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现代版BASIC(例如Quick BASIC): QDE$E.a
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Print "Hello, world!" @G*.1;jO
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以下的语句在Quick BASIC中同样有效: cAEok P
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? "Hello,world!" qyyq&
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BCPL cp%ii'
GET "LIBHDR" ;GOz>pg
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LET START () BE fu]N""~
$( ipjkZG@
WRITES ("Hello, world!*N") 3Aj*\e0t
$) |"7Y52d
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Befunge }ZzLs/v%X
"!dlrow olleH">v u|fXP)>.
, ]db@RbaH
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C \#6Fm_b]u
#include <stdio.h> A-uB\ L
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int main(void) i9m*g*"2
{ b$-e\XB!
printf("Hello, world!\n"); 926Tl
return 0; }V`mp
} lZWX7FO'
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C++ TH?9< C-C
#include <iostream> +sZUJ
= yXs?y"
int main() ;t(f1rPyE
{ }roG(
std::cout << "Hello, world!" << std::endl; AK-}V4C/A
return 0; H{(]9{
} I1"MPx{
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!;3PG9n3|h
C++/CLI lA;a
int main() uaw <
{ @i%YNI5*
System::Console::WriteLine("Hello, world!"); $nPAm6mH
} .p&Yr%~
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C# (C Sharp) io%')0p5q
class HelloWorldApp IL!=mZ>2O
{ kXc25y'blP
public static void Main() <@uOCRbV
{ ..<3%fL3
System.Console.WriteLine("Hello, world!"); XL5Es:"+?S
} 0 f/.>1M=
} %2l7Hmp4H
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COBOL .$rC0<G[K
IDENTIFICATION DIVISION. ra6o>lI(,
PROGRAM-ID. HELLO-WORLD. Vpp&