“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。
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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》。 0oNNEC
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以下是用不同语言写成的Hello World程序的几个例子: gGaA;YW1
Ada Yvi.l6JL
with Ada.Text_Io; use Ada.Text_Io; ?-Qq\D^+
procedure Hello is ;[qA?<GJ
begin 1bz%O2U-(
Put_Line ("Hello, world!"); xK*G'3Ge
end Hello; Sg &0a$
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汇编语言 q1a*6*YB
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x86 CPU,DOS,TASM <`Xt?K
MODEL SMALL `{oFdvL~)
IDEAL +#RgHo?f
STACK 100H ;i'mma_!
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DATASEG 'bQjJRq!
HW DB 'Hello, world!$' 1zc aI^e#
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CODESEG wbpz,
MOV AX, @data W>_K+:t
MOV DS, AX Hhzi(<e^
MOV DX, OFFSET HW ixvF`S9
MOV AH, 09H W"
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INT 21H ?wi^R:2|j
MOV AX, 4C00H 0Yk$f1g
INT 21H yC:C
END qNuBK6E#4
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x86 CPU,GNU/Linux,NASM 6M#}&Gv
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). j5:/Gl8
;Enter this into "hello.asm" then type: O>@ChQF
;"nasm -f elf hello.asm" gq7l>vT.
;"ld hello.o -o hello" #rI4\K
;"./hello" jtv<{7a
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section .data ;data section declaration BhzcimC)
msg db 'Hello World!',0AH z.T>=C
len equ $-msg ;string length Vr7L9%/wg
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section .text ;code section declaration 5F78)qu6N
global _start ;entry point (start of execution) D & Bdl5g
_start: mov edx,len ;string length zHX7%x,Cq
mov ecx,msg ;string start h]vuBHJ}
mov ebx,1 ;file handle: stdout @@z5v bs'{
mov eax,4 ;sys_write >c@jl
int 80h ;kernel system call Tr.u'b(
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mov ebx,0 ;return value WB.w3w[f
mov eax,1 ;sys_exit ce<88dL
int 80h ;kernel system call s$Vz1B
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x86 CPU,Windows,MASM32 gl~9|$ivj>
.386 SUb:0GUa
.model flat,stdcall ,Ma%"cWVC
option casemap:none NtG^t}V
;Include 文件定义 -PCFOm"
include windows.inc #G]g
include user32.inc O%1uBc
includelib user32.lib 2dCD.9s9~
include kernel32.inc EX/{W$
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includelib kernel32.lib sZ>0*S
;数据段 3z0%uY[e
.data nC}Y+_wo0
szCaption db 'A MessageBox!',0 $}JWJ\-]
szText db 'Hello,world!',0 >x*ef]aS
;代码段 f+%s.[;A
.code Ys>Z=Eky
start: w\1K.j=>|N
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK lNo]]a+_
invoke ExitProcess,NULL x"P@[T
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end start ^4C
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BEGIN { print "Hello, world!" } wW,
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BASIC gLwrYG7@
传统版BASIC(例如GWBASIC): .1:B\R((
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10 PRINT "Hello, world!" ;TL>{"z`x
20 END CsJ&,(s(
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或在提示符输入: y`Zn{mQ@[
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?"Hello, world!":END 6lm<>#_
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现代版BASIC(例如Quick BASIC): I`nC\%g
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Print "Hello, world!" skF}_
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以下的语句在Quick BASIC中同样有效: a(AYY<g
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? "Hello,world!" m>f8RBp]'
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BCPL ~{ucr#]C
GET "LIBHDR" FK@Gd)(
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LET START () BE ;NF:98
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WRITES ("Hello, world!*N") tu^C<MV
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#include <stdio.h> x b!&'cw
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int main(void) Ap> H-/C
{ @+sYwlA~
printf("Hello, world!\n"); BD [<>Wm
return 0; s8;*Wt
} -YS9u[
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C++ Nk<H=kw+
#include <iostream> -PaR&0Tt
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int main() h7PIF*7m
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{ >$7{H]
std::cout << "Hello, world!" << std::endl; w&
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return 0; 4veXg/l
} L0*f(H
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int main() \=H+m%
{ R]l2,0:
System::Console::WriteLine("Hello, world!"); QtLd(&
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} -HRa6
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C# (C Sharp) $U'*}S
class HelloWorldApp VuuF _y;
{ `We?j7O
public static void Main() 6 )lWuY]e
{ ZQyX zERp
System.Console.WriteLine("Hello, world!"); zor
} (d['f]S+&
} Wu)An
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