“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。 Y&k'4Y%
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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》。 f&^K>Jt1@#
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以下是用不同语言写成的Hello World程序的几个例子: pz?.(AmU\
Ada g<KBsz!{
with Ada.Text_Io; use Ada.Text_Io; bQ0m=BzF
procedure Hello is (a`z:dz}
begin "xS",6Sy
Put_Line ("Hello, world!"); .he%a3e
end Hello; 34]f[jJ|
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汇编语言 Pp3tEZfE
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x86 CPU,DOS,TASM ngEjbCV+
MODEL SMALL ~|Gtm[9Ru
IDEAL RIl%p~
STACK 100H 8!me$k&
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DATASEG &^qD<eZ!Eq
HW DB 'Hello, world!$' .'+Tnu(5q
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CODESEG <J {VTk ~
MOV AX, @data =wU08}
MOV DS, AX FL0(q>$*8
MOV DX, OFFSET HW v2JC{XqrI
MOV AH, 09H SMqJMirR
INT 21H C#>c(-p>RC
MOV AX, 4C00H W?F+QmD
INT 21H D19uI&U4
END
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x86 CPU,GNU/Linux,NASM h3>/..l
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). _hA p@?
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;Enter this into "hello.asm" then type: Bz9!a k~4
;"nasm -f elf hello.asm" hUB_[#8#
;"ld hello.o -o hello" 8WZM}3x$f{
;"./hello" bb+-R_3Kd
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section .data ;data section declaration )@\= pE.H
msg db 'Hello World!',0AH a0CmCv2#
len equ $-msg ;string length hqD]^P>l1
:=T+sT~
section .text ;code section declaration : )cPc7$8
global _start ;entry point (start of execution) F^3Q0KsT
_start: mov edx,len ;string length ~H7m7
mov ecx,msg ;string start x<~ pqq8]
mov ebx,1 ;file handle: stdout *s S7^OZ*
mov eax,4 ;sys_write "S_t%m&R
int 80h ;kernel system call o.keM4OQ
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mov ebx,0 ;return value 2u *o/L+
mov eax,1 ;sys_exit 2jOh~-LU
int 80h ;kernel system call }R;.~F
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L#M9 !
x86 CPU,Windows,MASM32 1ePZs$
.386 >|/NDF=\s
.model flat,stdcall pD eqBO
option casemap:none co|jUDu>W
;Include 文件定义 _K_!(]t
include windows.inc #78p#E
include user32.inc C~yfuPr\B
includelib user32.lib '0p 5|[ZD
include kernel32.inc bT|a]b:
includelib kernel32.lib 0;#%KC,
;数据段 9H_2Y%_
.data cWA9 n}Z
szCaption db 'A MessageBox!',0 B-@6m
szText db 'Hello,world!',0 A{bt
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;代码段 |ITp$_S
.code \|F4@
start: <IC=x(T
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK kn^RS1m
invoke ExitProcess,NULL {Uz@`QO3
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> j#f+0
end start +?w 7Nm`
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BEGIN { print "Hello, world!" } nL%;^`*8
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BASIC #g#vDR!
传统版BASIC(例如GWBASIC): W2D^%;mw
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10 PRINT "Hello, world!" Kfa7}f_
20 END @zL)R b%P$
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或在提示符输入: MUhC6s\F
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?"Hello, world!":END <H<5E'm
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现代版BASIC(例如Quick BASIC): }zY)H9J~
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Print "Hello, world!" WPygmti}Be
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以下的语句在Quick BASIC中同样有效: RrSSAoz1
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? "Hello,world!" :y==O4
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BCPL k_/hgO
GET "LIBHDR" $/90('D
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LET START () BE :@jhe8'w
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WRITES ("Hello, world!*N") bN$`&fC0
$) 7Bm 18
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Befunge Rq gH,AN
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C b}S}OW2
#include <stdio.h> #u~s,F$De
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int main(void) MzT#1~
{ >8Wvz.Nq/
printf("Hello, world!\n"); xnmIo?
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return 0; ?P@fV'Jo
} 0JQy-hpF
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C++ G3n* bv
#include <iostream> hO(8v&ns3
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int main() F+,X%$A#?
{ QLH&WF
std::cout << "Hello, world!" << std::endl; bhe~ekb
return 0; 4[a?..X
} 9 +"D8J7
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C++/CLI Ou</{l/
int main() <$wh@$PK
{ 8T92;.~(
System::Console::WriteLine("Hello, world!"); $r|R`n =
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C# (C Sharp) Uo v%12
class HelloWorldApp E*ybf'
{ g]85[xz
public static void Main() +qq,;npi
{ &B^#?vmO
System.Console.WriteLine("Hello, world!"); E@TX>M-&
} 3Yf%M66t
} @3KVYv,q
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COBOL EJ{Z0R{{
IDENTIFICATION DIVISION. K y~
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PROGRAM-ID. HELLO-WORLD. QEL^0c8 ~
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ENVIRONMENT DIVISION. 9|WBJ6
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DATA DIVISION. ;KJJK#j
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PROCEDURE DIVISION. %y.9S=,v,
DISPLAY "Hello, world!". ^_6%dKLK
STOP RUN. R9&T0Q