“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。 pVa|o&,
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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》。 H$z+gbjJ
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以下是用不同语言写成的Hello World程序的几个例子: h8-tbHgpb
Ada )* nbEZm@
with Ada.Text_Io; use Ada.Text_Io; '*ICGKoT
procedure Hello is f-nC+
begin tWOze, N
Put_Line ("Hello, world!"); U?ic$J]N
end Hello; ?~Ed
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汇编语言 0S7Isk2W
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x86 CPU,DOS,TASM #Ii.tTk
MODEL SMALL \q1%d.\X
IDEAL zPkPC}f(O
STACK 100H fvM3.P
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DATASEG n rB27
HW DB 'Hello, world!$' RF2XJJ
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CODESEG hPpXB:(-0
MOV AX, @data 6ch[B`[h,
MOV DS, AX QIV~)`;
MOV DX, OFFSET HW ~JPzjE
MOV AH, 09H i@^`~vj
INT 21H <0
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MOV AX, 4C00H 1sLfjH hv
INT 21H nJ})6/gK
END cRr `r[t
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x86 CPU,GNU/Linux,NASM iC+H;s5<
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). o5x^ "#
;Enter this into "hello.asm" then type: /0B?3&H
;"nasm -f elf hello.asm" {lUl+_58
;"ld hello.o -o hello" ;1k0o.3
;"./hello" }t-|^mY>
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section .data ;data section declaration >qvD39w
msg db 'Hello World!',0AH jeFl+K'1
len equ $-msg ;string length ]b| @<E7Y
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section .text ;code section declaration 6i9I 4*'
global _start ;entry point (start of execution) 2^M+s\p
_start: mov edx,len ;string length ^ED>{UiNI
mov ecx,msg ;string start Df3v"iCq}
mov ebx,1 ;file handle: stdout F X2`p_
mov eax,4 ;sys_write ;l?(VqX_E
int 80h ;kernel system call 3 v$4LY
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mov ebx,0 ;return value 7 ~8Fs@
mov eax,1 ;sys_exit %9Fg1LH42r
int 80h ;kernel system call =e/4Gs0*
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x86 CPU,Windows,MASM32
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.386 \bSHBTK
.model flat,stdcall IEf^.Z
option casemap:none :{Z^ _;Tf
;Include 文件定义 p&l:937
include windows.inc k $&A
include user32.inc B9:0|i!!A`
includelib user32.lib |?=1tS{iT
include kernel32.inc BVp.A]
includelib kernel32.lib N|vJrye
;数据段 X}Z%@ tL
.data IfCqezd
szCaption db 'A MessageBox!',0 kxwm08/|f
szText db 'Hello,world!',0 97dI4t<
;代码段 YDD]n*&
.code ADz|Y~V!
start: +[[gU;U"v
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK hzo,.hS's
invoke ExitProcess,NULL :/l
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 1&"1pH
end start 0^Cx`xdX:
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BEGIN { print "Hello, world!" } 6D(m8
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BASIC Qf]!K6eR
传统版BASIC(例如GWBASIC): FQ)Ekss~C
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10 PRINT "Hello, world!" BIyG[y?qO
20 END b7j#a#
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或在提示符输入: .utL/1Ej
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?"Hello, world!":END )~(_[='
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现代版BASIC(例如Quick BASIC): Mv=;+?z!
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Print "Hello, world!" +JG"eh&J"H
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以下的语句在Quick BASIC中同样有效: ,u2<()`8D
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? "Hello,world!" mJ7kOQ-.$
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BCPL s.
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GET "LIBHDR" f}eVfAf
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LET START () BE Yl])Q|2I
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WRITES ("Hello, world!*N") cgOoQP/#
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Befunge N0C5FSH
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C <n{9pZ5.
#include <stdio.h> /([aD~.
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int main(void) +6*I9R
{ 9HP--Z=
printf("Hello, world!\n"); -(EqBr@_
return 0; }f}&|Vap
} Pt+_0OsR
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C++ *#_jTwQe
#include <iostream> 1Rh&04O>VL
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int main() r[~$
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std::cout << "Hello, world!" << std::endl; <PxEl4
return 0; RZZB?vx
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C++/CLI s5HbuyR^
int main() :lAR;[WFS
{ .+<K-'&=
System::Console::WriteLine("Hello, world!"); ?m6E@.{
} __M}50^
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C# (C Sharp) RjT[y: !
class HelloWorldApp ^RyrUb
{ >7|37a
public static void Main() 2+.m44>Ti
{ n!p&.Mt
System.Console.WriteLine("Hello, world!"); 19S,>
} [o~w>,a
} JF7T1T
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COBOL 7"NUof?i
IDENTIFICATION DIVISION. G4i&:0
PROGRAM-ID. HELLO-WORLD. C9h8d
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ENVIRONMENT DIVISION. Ii)TCSt9U?
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DATA DIVISION. &z