“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。 'W p~8}i@
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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》。 d!4:nvKx
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以下是用不同语言写成的Hello World程序的几个例子: }FkF1?C
Ada IG8I<+< o
with Ada.Text_Io; use Ada.Text_Io; '=ydU+X
procedure Hello is }I~)o!N%7
begin {jEEAH)
Put_Line ("Hello, world!"); 6dqI{T-i?
end Hello; 3?wL)6Uj8J
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汇编语言 %/%TR@/
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x86 CPU,DOS,TASM 7$JE+gL/7
MODEL SMALL *#o2b-[V
IDEAL zIc_'Z,b
STACK 100H ,+'VQa"]
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DATASEG +)*oPSQ5
HW DB 'Hello, world!$' qo:t"x^
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CODESEG A7GWU{i
MOV AX, @data RnUud\T/
MOV DS, AX V`"Cd?R0Z
MOV DX, OFFSET HW Qs8Rb ]%|
MOV AH, 09H 3^Z@fC
INT 21H Z67'/z$0
MOV AX, 4C00H ;^so;>F
INT 21H 6JE_rAab
END wl%I(Cw{]
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x86 CPU,GNU/Linux,NASM g"X!&$&
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). 0
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;Enter this into "hello.asm" then type: md/NMC
\
;"nasm -f elf hello.asm" I\$?'q>
;"ld hello.o -o hello" Ihx[S!:
;"./hello" E5t
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section .data ;data section declaration ePiZHqIsv/
msg db 'Hello World!',0AH 7y=1\KW(
len equ $-msg ;string length ryt`yO
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section .text ;code section declaration p)* x7~3e
global _start ;entry point (start of execution) |
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_start: mov edx,len ;string length FtybF
mov ecx,msg ;string start kC/An@J^#
mov ebx,1 ;file handle: stdout >ToI$~84
mov eax,4 ;sys_write opon"{
int 80h ;kernel system call D]+@pKb
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mov ebx,0 ;return value c=4z+_ K
mov eax,1 ;sys_exit g ~>nT>6
int 80h ;kernel system call v9vY#W
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x86 CPU,Windows,MASM32 8:t1%O$
.386 J|[`8 *8
.model flat,stdcall Q4&<RWbT^
option casemap:none ' $X}' u
;Include 文件定义 K6z-brvw"
include windows.inc b:(*C
include user32.inc Se&%Dr3Nv
includelib user32.lib 8??%H7~
include kernel32.inc d#wK
includelib kernel32.lib ?3Dsz
;数据段 fIcra
.data j8#B
szCaption db 'A MessageBox!',0 z3p#`
szText db 'Hello,world!',0 &fWYQ'\>
;代码段 Oz_|pu
.code |p{FSS
start: "M5&&\uT
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK ,c'a+NQ_t
invoke ExitProcess,NULL 5T;,wQ<
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> R^F\2yth-
end start >QM$
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BEGIN { print "Hello, world!" } YKs^aQm#
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BASIC 1ssEJ;#s
传统版BASIC(例如GWBASIC): Nm]\0m0p-
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10 PRINT "Hello, world!" y*Wl(w3
20 END v
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或在提示符输入: B?tO&$s
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?"Hello, world!":END 'F@#.Op`
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现代版BASIC(例如Quick BASIC): lfp'D+#p{
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Print "Hello, world!" v/yt C/WH"
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以下的语句在Quick BASIC中同样有效: h .Iscr^~
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? "Hello,world!" xPi/nWl`|
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GET "LIBHDR" q0hg0DC[;
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LET START () BE ?#LbhO*
$( -a[]#v9
WRITES ("Hello, world!*N") kt; |
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Bld $<uU
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Befunge C +%&!Q
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C S3=M k~_&
#include <stdio.h> l*|^mx^Q
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int main(void) aNpeePF)z
{ w`vJE!4B
printf("Hello, world!\n"); ;u'mSJI'
return 0; ,HEx9*E/s
} |yi3y `f
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C++ U/2g N
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#include <iostream> &rX..l
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int main() `CI9~h@k
{ @xJ qG"
std::cout << "Hello, world!" << std::endl; %($qg-x
return 0; mAFqA
} _M+'30
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C++/CLI ^j?\_r'j
int main() jGzs; bE
{ ujZki.x
System::Console::WriteLine("Hello, world!"); [IVT0
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} O~g_rcG
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