“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。 zbP#y~[
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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》。 sme!!+Rd
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以下是用不同语言写成的Hello World程序的几个例子: |I=\+P}s
Ada )-d&XN7
with Ada.Text_Io; use Ada.Text_Io; QfsTUAfR
procedure Hello is e[J0+
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begin 8}Su7v1
Put_Line ("Hello, world!"); ZTP&*+d
end Hello; 8(0q,7)y
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汇编语言 ;Z}V}B
qEB]Tj e[
x86 CPU,DOS,TASM .\b# 0w
MODEL SMALL \S"YLRn"
IDEAL 9h
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STACK 100H (
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0:3<33]x
DATASEG 0x8aKq\'
HW DB 'Hello, world!$' P6o-H$
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CODESEG 6WX+p3Kv
MOV AX, @data @d=4C{g%o
MOV DS, AX @@Vf"o+S
MOV DX, OFFSET HW U)grC8 C
MOV AH, 09H *dm?,~f%<
INT 21H C6(WnO{6
MOV AX, 4C00H m'suAj0
INT 21H 6GtXM3qtS
END qlfYX8edZ
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x86 CPU,GNU/Linux,NASM p*Hbc|?{Q&
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). X?Mc"M
;Enter this into "hello.asm" then type: bol#[_~
;"nasm -f elf hello.asm" C/x<_VJzN/
;"ld hello.o -o hello" x?MSHOia`P
;"./hello" I!sB$=n
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section .data ;data section declaration U m9]X@z
msg db 'Hello World!',0AH O8%Y .SK
len equ $-msg ;string length >E`p@
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section .text ;code section declaration fd Rw:K8
global _start ;entry point (start of execution) = A;B-_c
_start: mov edx,len ;string length _o-D},f*e
mov ecx,msg ;string start _oJq32
mov ebx,1 ;file handle: stdout C) "|sG
mov eax,4 ;sys_write *R^u lp[W
int 80h ;kernel system call h_Cac@F0
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mov ebx,0 ;return value *k#M;e
mov eax,1 ;sys_exit
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int 80h ;kernel system call *PjW,
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x86 CPU,Windows,MASM32 (C
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.386 4_w+NI,;
.model flat,stdcall &18CCp\3)c
option casemap:none __,1;=
;Include 文件定义 1k}U+
include windows.inc HrZ\=1RB
include user32.inc @fWmz,Ngl
includelib user32.lib UR&Uwa&.
include kernel32.inc c~+;P(>
includelib kernel32.lib U,4:yc,)s
;数据段 v8xNtUxN
.data 6T5nr
szCaption db 'A MessageBox!',0 Cq,ox'kGl
szText db 'Hello,world!',0 YdK]%%
;代码段 PDnwaK
.code zi*2>5g
start: `2@t) :
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK o(I[_oUy\
invoke ExitProcess,NULL 007SA6xq
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> HV??B :
end start `% x6;Ha
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BEGIN { print "Hello, world!" } ddMSiwbY)
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传统版BASIC(例如GWBASIC): TB
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10 PRINT "Hello, world!" EQkv&k5X
20 END \Om<
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或在提示符输入: ncluA~ 8
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?"Hello, world!":END tndtwM*B'
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现代版BASIC(例如Quick BASIC): i[~oMwc&
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Print "Hello, world!" P{eL;^I
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以下的语句在Quick BASIC中同样有效: tIgKnKr^)
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? "Hello,world!" f.`noZN
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GET "LIBHDR" p
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LET START () BE
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WRITES ("Hello, world!*N") )jK"\'cK
$) 38dXfl
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Befunge
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C ? Ovl(4VG
#include <stdio.h> cbl2D5s+i]
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int main(void) FrO)3 1z
{ \+E{8&TH'
printf("Hello, world!\n"); bIP{DxKS
return 0; VpJ/M(UD-
} ln7{c #lE
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C++ yVm~5Y&Z
#include <iostream> ?9_<LE
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int main() I_J;/!l=
{ ]l>)Di#*o
std::cout << "Hello, world!" << std::endl; 8/f,B:by
return 0; ^o]ZDc
} KAm v7
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C++/CLI N.C<Mo
int main() zR/d:P?
{ z!5^UD8"W
System::Console::WriteLine("Hello, world!"); K*Zf^g
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} #CoJ S[t
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C# (C Sharp) a3
<D1"
class HelloWorldApp ,V!s w5_5m
{ cA1"Nek
public static void Main() yc2c{<Ya5
{ <8p53*a
System.Console.WriteLine("Hello, world!"); zCT Wi
} imAsE;:
} Z VuHO7'
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