Ruby 7-day entry (2 functions, arrays and classes), ruby 7-dayDAY 2
Continue the next day. Today we will focus on the basic elements of functions, collections, classes, and other programming.2.1 simple definition of function 2.1.1
def tell_me puts true end
Defining a simple function (No parameter and no return value) is simple. Use def end to wrap the function body.
2.1.2 Parameters
def tell_me(a)puts ae
OS + CentOS 7/centos 7/VirtualBox/VirtualBox-5.1-5.1.28_117968_el7-1.x86_64.rpm, centosvirtualbox
S
VirtualBox: resolves the problem of libSDL-1.2.so.0 () Errors During VirtualBox installation.
Http://www.sklinux.com/983
When you install VirtualBox for Centos6.2, you encounter the following error:Error: Failed dependencies:LibSDL-1.2.so.0 () (64bit) is needed by VirtualBox-4.2-4.2.4_81684_el6-1.x86_64The or
Install jdk in CentOS 7 and jdk in centos 7
View System Version
[root@zabbix ~]# cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core) [root@zabbix ~]# uname -aLinux zabbix.com 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Download the jdk package. Here I chose the oracle java tar.gz package.
Http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downlo
Install JAVA in CentOS 7 and in centos 7
Step 1: Check whether the built-in JDK of Linux is installed
The installed CentOS comes with OpenJdk and uses the java-version command. The following information is displayed:
Java version "1.6.0"OpenJDK Runtime Environment (build 1.6.0-b09)OpenJDK 64-Bit Server VM (build 1.6.0-b09, mixed mode)
It is best to uninstall openjdk first and install the jdk of sun.
Check r
Mysql-7 data retrieval (5), mysql-7 Data RetrievalJoin)
One of the most powerful functions of SQL is to join tables in the execution of data retrieval and query. Join is the most important operation that can be performed using SQL SELECT.
Example: This example contains two tables. One table is vendors. The vendors table contains information about all suppliers. Each supplier occupies one row and each suppli
Python study notes 7-advanced iterator, python study notes 7-
Evaluate any string as a python expression:
Eval () method:
Eval (source [, globals [, locals])-> valueEvaluate the source in the context of globals and locals.The source may be a string representing a Python expressionOr a code object as returned by compile ().The globals must be a dictionary and locals can be any mapping,Defaulting to the curre
How to Develop a java open-source framework ----- automatically generate online documents based on the implementation of the Jvn framework (Lecture 7) ----- Lecture 7 of jvn
I,
The blogger is teaching you how to develop a javaEE framework. I name the framework Jvn, And the blog has a complete development video. Every blog post is a knowledge point;
About the framework of the introduction and learning, you c
Jdk1.7 tomcat-7 installation, jdk1.7tomcat-7
Due to frequent software changes, you cannot directly download wget or click to download it online.
Download jdk
http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
Select Accept License Agreement and select a 64-bit jdk-7u65-linux-x64.tar.gz, as shown in
Download tomcat. The tomcat version will be updated. The downloaded version
How to install chrome on centos 7 and centos 7 chrome
Install
Download the file at http://www.google.cn/chrome/browser/desktop/index.html and select 64 bit. rpm (applicable to Fedora/openSUSE). Of course, if you are a 32-bit system, you can select 32 bit. rpm (applicable to Fedora/openSUSE). Select "accept and install" to go To the download page. After the download is complete, click "Install.
Solve th
When running some software in Windows 7, such as Dreamweaver cs5 and fireworks cs5, there is often no response. I thought it was a software problem. It was actually a bug in direct2d and direct3d on Windows 7, fix the problem after the patch kb2488113 is installed.
This bug has a significant impact on creamwaver cs5, which often does not respond and is almost difficult to use.
This patch is optional a
There are 7 shutdown methods in the win7 shutdown options, respectively
Switch user, log off, lock, restart, sleep, hibernate, and shut down ).
The following describes their differences:
1. Switch user, log off, lock
Windows 7 supports multi-user logon. In other words, users can log on as administrators or other users at the same time. For example, in my system, two users are currently logged on, one is ac
I. oppo find 7 starts the recovery operation:Method for manually entering recovery:1. oppo find 7 is an Android system. We only need to shut down and press the "power key and volume increase key and volume decrease key" button on the phone to go to recovery.2. As shown in the following figure, it indicates that the recovery has been successfully written.Third-party recovery ing method1: We need ro
1. This problem occurs we can try the Thunder 7 uninstall first, login to: http://dl.xunlei.com/official Download Thunderbolt 7 and then reinstall.
2. In addition to reinstallation, it is best to save the crash information by creating a dump file for the task list (pictured below):
This problem resolution:
Open Task Manager-the process, the "Thunder.exe" process right, the "Create transfer
At the time of CentOS 5, we were accustomed to eth0 such a network device naming, in CentOS 6, found that the network device became EM1 name. At that time, when we were installing, we added biosdevname=0 to the startup parameters and we could continue to use the name eth0.
By the time the CentOS 7, the original parameter biosdevname=0 did not work, the network device became ENO1 such name. If you want to continue using a traditional name such as eth0
Step 1Right-click the wireless network icon in the computer taskbar on the desktop, select your own wireless signal from the open signal list, and selectAutomatic connectionAnd then clickThe connection details are as follows::Step 2Enter the wireless password and clickOK. As shown in the following figure:Step 3WhenSet network locationIn this example, we select the first option on the home machine:Step 4, As shown in the figure below, click the red box to displayConnected,InternetAccess. As shown
1. First has escaped iOS7 and installed pp Assistant IPA patch ios7.x user, into the cydia-management-package, find the IPA patch ios7.x file and uninstall it.
2. Connect the hands of the equipment to the computer, through the PC version of Apple Software Management client (in the case of PP assistant), find the file-file system (Jailbreak)-/var/mobile/library/caches/path folder, Remove the com.apple.mobile.installation.plist and Com.apple.launchservices-054.csstore two files in the fold
refactoring. The following is a list of modified content:
1. Check whether the value of nextProjectile is nil at the beginning of the function. This means that our current touch event is happening in the shooting process. That is to say, the turret has shot a bullet.
2. Previously, we used a projectile local variable and added it to the current scenario. In this version, we added a member variable of nextProjectile, but it was not immediately added to the current scenario. Because it will be us
1. I will send you some brochuresif you are interested.
If you are interested, I can send you some brochures about the product.
2. Can you suggest an alternative ﹖
Can you tell me other convenient time?
3. As an alternativei wish to propose May 3rd.
Another convenient time is January 1, May 3.
4. If you are interestedwe may consider selecting you as our partner.
If your company is interested, we can consider choosing you as our partner.
5. I see. But aren't these prices for your domestic
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