“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。 17WNJ
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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》。 <P|`7wfxE
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以下是用不同语言写成的Hello World程序的几个例子: Oyi;bb<#
Ada [B}1z
with Ada.Text_Io; use Ada.Text_Io; 7k'=F m6za
procedure Hello is _7r qXkp%
begin b ^uP^](J
Put_Line ("Hello, world!"); >r;ABz/
end Hello; R#"U/8b>z
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汇编语言 fn1 ?Qp|
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x86 CPU,DOS,TASM tn"Y9
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MODEL SMALL wrz+2EP`
IDEAL \Ku9"x
STACK 100H 'dmp4VT3
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DATASEG jHs<s`#h
HW DB 'Hello, world!$' 3C>2x(]M
HF*j`}
CODESEG B`g<Ge~
MOV AX, @data Q
mb[ e>
MOV DS, AX Rf)'HT
MOV DX, OFFSET HW S1D9AcK
MOV AH, 09H % MfGVx}nG
INT 21H 1bV 2
MOV AX, 4C00H T
[T 6
INT 21H fl} rz
END E9yFREvQc
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x86 CPU,GNU/Linux,NASM $w|o@ Ml)
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). :SpG&\+
;Enter this into "hello.asm" then type: Y&?|k'7
;"nasm -f elf hello.asm" UI|v/(_^F
;"ld hello.o -o hello" 03X<x|
;"./hello" "\VW.S
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section .data ;data section declaration 9F2w.(m
msg db 'Hello World!',0AH c*y$bf<
len equ $-msg ;string length LVPt*S= /
K!IF?iell
section .text ;code section declaration OSSd;ueur$
global _start ;entry point (start of execution) q`/amI0
_start: mov edx,len ;string length 1_Dn?G^H
mov ecx,msg ;string start 7sQ]w
mov ebx,1 ;file handle: stdout /Nj:!!
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mov eax,4 ;sys_write S[W9G)KWp
int 80h ;kernel system call LP5eFl`|T
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mov ebx,0 ;return value 8gVxiFjo
mov eax,1 ;sys_exit 5?V?
int 80h ;kernel system call lH#@^i|G
jw:4fb
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x86 CPU,Windows,MASM32 r*X}3t*
.386 D%c7JK
.model flat,stdcall w?V[[$
option casemap:none tz\+'6NpOb
;Include 文件定义 MZUF! B
include windows.inc dD/29b(
include user32.inc s,UN'~e1
includelib user32.lib l|@/?GaH
include kernel32.inc ;4-pupK~%
includelib kernel32.lib m[g< K
;数据段 |QAeQWP+1
.data ,z?<7F1q=
szCaption db 'A MessageBox!',0 6e$sA (a=i
szText db 'Hello,world!',0 9B!im\]O
;代码段 4i+PiD:H
.code 4b3 F9
start: W2r6jm!
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK <|KKv5[
invoke ExitProcess,NULL ]MqH13`)A
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> w8m8r`h
end start <?q&PCAn^
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BEGIN { print "Hello, world!" } 9A/Kn]s(jj
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BASIC rZ8Y=) e
传统版BASIC(例如GWBASIC): (n":]8}
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10 PRINT "Hello, world!" P`Hd*xh".j
20 END _V_8p)%
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或在提示符输入: 5 `{|[J_[
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?"Hello, world!":END AhbT/
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现代版BASIC(例如Quick BASIC): o@<6TlZM
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Print "Hello, world!" Ac5o K
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以下的语句在Quick BASIC中同样有效: m'Ek p
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? "Hello,world!" .q_uJ_qu-
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BCPL eZR8<Z%
GET "LIBHDR" ;G%wc!
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LET START () BE G)tq/`zNw
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WRITES ("Hello, world!*N") g9([3pV,
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fncwe ';?
Befunge FfD
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, 2vh!pez_
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Brainfuck l$p_])x
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+++++++++++++++.>.+++.------.--------.>+.>. VeN&rjc
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C L6rs9su=7
#include <stdio.h> {x&jh|f`g
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int main(void) &-8-xw#.
{ RXx?/\~yd;
printf("Hello, world!\n"); qa0JQ_?o]
return 0; r_g\_y7ua
} ^7~SS2t!
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C++ k@t,[
#include <iostream> G3_mWppH
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int main() t'=~"?T/o
{ '.h/Y/oz
std::cout << "Hello, world!" << std::endl; ir@N>_
return 0; 5&