Objective-C basics: Basic knowledge of Object-Oriented Programming (OOP) (1) -- indirect, objective-coop
Since Cocoa is based on the concept of OOP and Objective-C is also an object-oriented programming language, it is necessary to frequently discuss the concept of OOP when learning Objective-C.
0x01 what is indirect?
Indirection is a key concept of OOP. It can be understood as "indirectly obtaining a value through a pointer in code, rather than dire
overstocks cost is too high, and the majority of customers are in the project after the acceptance of the payment, which requires a large amount of pre-payment, for an entrepreneurial company, it is really difficult.This time I began to calm down, pre-business market analysis, competitor analysis, market planning and other pre-preparation is too important, really wrong direction, efforts in vain. In the blink of an eye, by the end of the year, only 7 or 80,000 dollars were earned, and our spend
Today, in the virtual machine, we found that the remaining disk space is less than 10%, a total of 30 GB of disk space, less than 2 GB. If we create an RMAN full backup for ORACLE, there will be little left, so I want
Today, in the virtual machine, we found that the remaining disk space is less than 10%, a total of 30 GB of disk space, less than 2 GB. If we create an RMAN full backup for ORACLE, there will be little left, so I want
Today, in the virtual machine, we found that the remaining
# 工作簿, 工作表,单元格#workbook ,sheet ,cell# 灵活擦欧总各种对象,进行修改‘# 编辑样式%cd D:\python全站\officeD:\python全站\office# pip install openpyxlimport openpyxlwb = openpyxl.load_workbook(‘coop.xlsx‘) # 加载创建的表格coop.xlsxwb.get_active_sheet()c:\users\coop\miniconda3\envs\coop\lib\site-packages\ipykernel_launcher.py:1: DeprecationWarning: Call to deprecated function get_active_sheet (Use the .active property). """Entry point for la
4333:jsoi2012 the test of the wise time
limit:10 Sec Memory limit:256 MBsubmit:68 solved:18[Submit] [Status] [Discuss]
Description A.D. 1371, the emperor of the Dajian temple in the Arctic pavilion, just a few years, the chicken coop has built a king temple, Kuan Kung temple, True Zhen Wu Miao, Hero Temple, Wang, all the temple, Bian Shenqiu Pot temple, Martyrs ' Temple, Liu Yueyue temple, Cao Wuhi Temple, a total of 10 temples, collectively
http://blog.csdn.net/hsuxu/article/details/9876983Before emphasizing so much about the Linux kernel poll and epoll, just want to let everyone first have a knowledge:The selectors in Java NiO rely on these system calls from the operating system kernel, and we'll only talk about the NIO implementations associated with the Linux kernel, and, of course, windows or other operating system implementations are broadly similar, and I believe you can comprehend by analogy.Then, this article from here will
development of the game system of Ding Mao Jin Chicken farm ( Yang elder sister:136*027*9-9492 micro-electric ) Ding Mao Golden Chicken Farm game development, Ding Mao Jinfeng Chicken financial system APP project development, Ding Mao Golden Chicken Farm Management System source code development operation, Ding Mao Jinfeng chicken New Farm model software development, Ding Mao Jin Chicken financial system development How much moneyDing Mau Jin chicken is to invest in 268 yuan, registered an accou
is 5-12 digits! ", 'The address length cannot exceed 50 characters! ',' Is a Chinese character within 10 characters! ',' The mobile phone number is 11 digits! ',' The zip code is a six-digit number! ',' The username must be 3-15 characters long! ',' Domain name format error! ',' This user name has been registered! ',' This email address has been registered! ']
Var ErrorClass = ['msg _ OK ', 'msg _ warning', 'msg _ warning', 'msg _ error', 'msg _ warning', 'msg _ error ', 'msg _ warning', 'msg
is 5-12 digits! ", 'The address length cannot exceed 50 characters! ',' Is a Chinese character within 10 characters! ',' The mobile phone number is 11 digits! ',' The zip code is a six-digit number! ',' The username must be 3-15 characters long! ',' Domain name format error! ',' This user name has been registered! ',' This email address has been registered! ']
Var ErrorClass = ['msg _ OK ', 'msg _ warning', 'msg _ warning', 'msg _ error', 'msg _ warning', 'msg _ error ', 'msg _ warning', 'msg
Ec (2); nbsp; the Code below copies the code functionmatchdomain ($ q) {preg_match ([a-z0-9] (w | }? [A-z0-9] | [a-z0-9]).) {1 ,} (aero | arpa | asia | biz | cat | com | coop | co | edu | gov | info | int | jobs | mil | mobi | mu script ec (2 ); script
The Code is as follows:
Function matchdomain ($ q ){Preg_match ('/([a-z0-9] (w | }? [A-z0-9] | [a-z0-9]).) {1 ,} (aero | arpa | asia | biz | cat | com |
ability of Chinese scholars comes from the relatively few feasible ideas. As a result, many scholars in the discussion together, no one is willing to throw their own ideas, for fear of being stolen. As a result, academics are either talking about gossip or discussing the details of others ' results. Don't we say the idea, we really have a good harvest? I believe that the human brain needs a certain degree of intensity of use, and constantly output ideas, in order to make room for later ideas. L
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