Is there a performance difference between i++ and ++i in C++?

Is there a performance difference between i++ and ++i in C++?

We have the question is there a performance difference between i++ and ++i in C?What's the answer for C++? 1:[Executive Summary: Use ++i if you don't have a specific reason to use i++.]For C++, the answer is a bit more complicated.If i i

“cannot resolve symbol R” in Android Studio

“cannot resolve symbol R” in Android Studio

In every instance in all of my classes where I reference R.id.something, the R is in red and it says "cannot resolve symbol R". Also every time there is R.layout.something it is underlined in red and says "cannot resolve method setContentV

jQuery AJAX file upload PHP

jQuery AJAX file upload PHP

I want to implement a simple file upload in my intranet-page, with the smallest setup possible.This is my HTML part:and this is my JS jquery script:$("#

“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”

“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”

While executing an INSERT statement with many rows, I want to skip duplicate entries that would otherwise cause failure. After some research, my options appear to be the use of either: ON DUPLICATE KEY UPDATE which implies an unnecessary u

mysqli or PDO - what are the pros and cons? [closed]

mysqli or PDO - what are the pros and cons? [closed]

In our place we're split between using mysqli and PDO for stuff like prepared statements and transaction support. Some projects use one, some the other. There is little realistic likelihood of us ever moving to another RDBMS.I prefer PDO fo

How to resize a sprite in Libgdx?

How to resize a sprite in Libgdx?

I have a problem with the method sprite.setSize(float x, float y) in Libgdx. It does not affect the size or the dimensions of the sprite. They remains fixed whatever I pass to the setSize() method.here is my code:public class GameScreen imp

How can I construct a java.security.PublicKey object from a base64 encoded string?

How can I construct a java.security.PublicKey object from a base64 encoded string?

I have a bse64encoded string Public key from external source (Android Store) and I need to use it to verify signed content. How can I convert the string into an instance of the java.security.PublicKey interface. I am on Java 6 if that makes

What are the implications of running python with the optimize flag?

What are the implications of running python with the optimize flag?

I cannot seem to find a good simple explanation of what python does differently when running with the -O or optimize flag. 1:assert statements are completely eliminated, as are statement blocks of the form if __debug__: ... (so you can

Cannot convert '0000-00-00 00:00:00' to TIMESTAMP

Cannot convert '0000-00-00 00:00:00' to TIMESTAMP

the field definition /** Date. */ @Column(columnDefinition = "datetime") private Date date;setterpublic void setDate(final Date date) { DateFormat dfmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { this.date = dfmt.parse

How to encrypt/decrypt an integer in PHP

How to encrypt/decrypt an integer in PHP

is there any way to make 2 way encryption/decryption for an integer (or string)Please note that I am not looking for encodingi need something like this crypting (100) 24694 crypting (101) 9564jh4 or 45216 or gvhjdfT or whatever ...

Android: Can not send http post

Android: Can not send http post

I've been banging my head trying to figure out how to send a post method in Android. This is how my code look like:public class HomeActivity extends Activity implements OnClickListener { private TextView textView; @Override public

Cannot Type EditText in ExpandableListView Child

Cannot Type EditText in ExpandableListView Child

i am using expandableList and each child has its edittext to enter a number... when the child is pressed, the edittext shows. if it is not, the edittext stays invisible.. but when i tap on the edittext, the keyboard shows in number (because

Constructor Chaining in Java

Constructor Chaining in Java

I hava slight doubt regarding the Output of the Program of Constructor Chaining I showed Below:class Cube { int length; int breadth; int height; public int getVolume() { return (length * breadth * height); } Cube()

Apriori Algorithm

Apriori Algorithm

I've heard about the Apriori algorithm several times before but never got the time or the opportunity to dig into it, can anyone explain to me in a simple way the workings of this algorithm? Also, a basic example would make it a lot easier

How to highlight the grid view item on select?

How to highlight the grid view item on select?

I am creating a Grid view layout with image and text.I want multi-select of item which is working fine but i want to highlight the grid items which is selected.Here is my code:public class FragMent1 extends Fragment{ BaseAdapter MyAd

What are the Differences between C++ Templates and Java/C# Generics and what are the limits? [closed

What are the Differences between C++ Templates and Java/C# Generics and what are the limits? [closed

I read an interesting Article/Thread/Discussion from here and i got following questions:What are the limitations of Java/C# generics?What is possible with C++ Templates that is impossible with Java/C# generics?Edit 1 More recommended questi

Android service not launched by JUnit test

Android service not launched by JUnit test

I have this test class to test a remote service:public class CoreServiceBasicTest extends ServiceTestCase implements ServiceConnection { /** Tag for logging */ private final static String TAG = CoreServiceBasicTest.class.getName();

How to programmatically kill a storm topology?

How to programmatically kill a storm topology?

I am using a java class to submit a topology to the storm cluster and I also plan to use java class to kill the topology. But as per storm documentation, the following command is used to kill a topology and there is no Java method (and this

files produced by asset:precompile don't match urls generated by stylesheet_link_tag (missing d

files produced by asset:precompile don't match urls generated by stylesheet_link_tag (missing d

I'm using Ruby 2.0.0-p247 and Rails 4.0.0If I make a minimal Rails 4 site like this:rails new minimalcd minimalrails generate controller home indextee config/routes.rb Then precompile the assets withrake assets:precompileIt generates assets

Resource (.resx) file Key naming conventions?

Resource (.resx) file Key naming conventions?

I'm building a C# app that will likely contain a couple resource files to store strings for use in language translation. I'm trying to come up with a naming convention for the Keys in my resouce files. Has anyone tackled this before me?

Where did link_to_function disappear to in Rails 3?

Where did link_to_function disappear to in Rails 3?

I was just playing around with Rails 3 beta and noticed that link_to_function is now gone. I presume there's an alternate method of achieving the same result (onclick event?) but I was wondering if there's a more Rails-3'y way of doing it.

Why is using [DataMember(EmitDefaultValue = false)] not recommended?

Why is using [DataMember(EmitDefaultValue = false)] not recommended?

In WCF you can define a contract using the [DataContract] and [DataMember] attributes, like this:[DataContract]public class Sample { [DataMember(EmitDefaultValue = false, IsRequired = false)] public string Test { get; set; }}This arti

VS2010 Advantages of Add Service Reference over direct ClientBase

VS2010 Advantages of Add Service Reference over direct ClientBase

I have noticed that when "Add Service Reference" is used in VS2010 then a ton of files are created. One of the files is Reference.cs which creates a ClientBase for the service contract.Thus, I was wondering is there any advantage to the sle

USB Mobile Broadband Modem on Windows 10 IoT?

USB Mobile Broadband Modem on Windows 10 IoT?

Anyone had experience using a USB Mobile Broadband on Windows IoT with the Raspberry Pi2 already?I have a Huawei datacard in the Windows IoT and appears as HUAWEI Mobile on connected devices but I'm unable to see the device on the wifimanag

Plotting a raster with the color ramp diverging around zero

Plotting a raster with the color ramp diverging around zero

I am trying to plot a map with positive and negative values.All positive values should have red color while negative should have blue color and zero should have white just like in this sample plot with discrete colorsBelow is the code I'm u