how to make negative numbers into positive
I am having the negative floating point number as: ``` a = -0.340515; ``` to convert this into positive number I used the abs() method as: ``` a = abs(a); ``` the result is `a = 0.000000;` But ...
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- 29 Aug at 07:12
The apk must be signed with the same certificates as the previous version
I had uploaded my app to Google Play (back when it was called Android Market) some time ago. Today I updated the app, but I had deleted the previous keystore and created a new one. When uploading, it...
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- 10 Oct at 11:56
How to list the certificates stored in a PKCS12 keystore with keytool?
I wanted to list the certificates stored in a PKCS12 keystore. The keystore has the extension `.pfx`
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- 30 Oct at 16:52
What is the difference between match_parent and fill_parent?
I'm a little confused about two XML properties: `match_parent` and `fill_parent`. It seems that both are the same. Is there any difference between them?
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- 12 Mar at 13:35
$(window).width() not the same as media query
I am using Twitter Bootstrap on a project. As well as the default bootstrap styles I have also added some of my own ``` //My styles @media (max-width: 767px) { //CSS here } ``` I am also using...
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- 24 Mar at 11:30
Keyboard shortcut to comment lines in Sublime Text 3
In Sublime Text 2 it was possible to comment out a line or a block of lines with + and ++. According to the menu `Edit > Comment` these shortcuts should be valid, but in Sublime Text 3 (build 3047) t...
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- 23 Aug at 11:10
Go to URL after OK button if alert is pressed
I need to make sure that when the user clicks OK in a JavaScript alert window, the browser moves to a different URL. Is this possible?
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- 30 Apr at 08:21
Can constructors be async?
I have a project where I'm trying to populate some data in a constructor: ``` public class ViewModel { public ObservableCollection<TData> Data { get; set; } async public ViewModel() { ...
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- 14 Mar at 19:29
Set the default value in dropdownlist using jQuery
I have many options in my dropdownlist like: ``` <option value="1">it's me</option> ``` I need to select the option who have value inside the tag, not by attribute like `1`. How can I do this usi...
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- 10 Jun at 22:31
ReactJS - .JS vs .JSX
There is something I find very confusing when working in `React.js`. There are plenty of examples available on internet which use `.js` files with `React` but many others use `.jsx` files. I have read...
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- 12 Oct at 05:11
XAMPP Port 80 in use by "Unable to open process" with PID 4
XAMPP won't work it says ``` Port 80 in use by "Unable to open process" with PID 4! 6:32:24 PM [Apache] Apache WILL NOT start without the configured ports free! 6:32:24 PM [Apache] You need ...
Naming Classes - How to avoid calling everything a "<WhatEver>Manager"?
A long time ago I have read an article (I believe a blog entry) which put me on the "right" track on naming objects: Be very very scrupulous about naming things in your program. For example if my app...
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- 23 May at 12:26
Why is "except: pass" a bad programming practice?
I often see comments on other Stack Overflow questions about how the use of `except: pass` is discouraged. Why is this bad? Sometimes I just don't care what the errors are and I want to just continue ...
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- 5 Jul at 10:0
Regular Expression to match valid dates
I'm trying to write a regular expression that validates a date. The regex needs to match the following - - - - - So far I have ``` ^(([1-9]|1[012])[-/.]([1-9]|[12][0-9]|3[01])[-/.](19|20)\d\d)|(...
How can I create a Java 8 LocalDate from a long Epoch time in Milliseconds?
I have an external API that returns me dates as `long`s, represented as milliseconds since the beginning of the Epoch. With the old style Java API, I would simply construct a `Date` from it with ```...
How to sort an array in descending order in Ruby
I have an array of hashes: ``` [ { :foo => 'foo', :bar => 2 }, { :foo => 'foo', :bar => 3 }, { :foo => 'foo', :bar => 5 }, ] ``` I am trying to sort this array in descending order according t...
What is the best way to conditionally apply attributes in AngularJS?
I need to be able to add for example "contenteditable" to elements, based on a boolean variable on scope. Example use: ``` <h1 attrs="{'contenteditable=\"true\"': editMode}">{{content.title}}</h1> `...
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- 31 Jul at 15:34
pass post data with window.location.href
When using window.location.href, I'd like to pass POST data to the new page I'm opening. is this possible using JavaScript and jQuery?
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- 3 Mar at 00:25
MySQL INNER JOIN select only one row from second table
I have a `users` table and a `payments` table, for each user, those of which have payments, may have multiple associated payments in the `payments` table. I would like to select all users who have pay...
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- 27 Feb at 14:49
What does the question mark character ('?') mean in C++?
``` int qempty() { return (f == r ? 1 : 0); } ``` In the above snippet, what does "?" mean? What can we replace it with?
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- 12 Sep at 16:52
What is the difference between linear regression and logistic regression?
When we have to predict the value of a [categorical](https://en.wikipedia.org/wiki/Categorical_variable) (or discrete) outcome we use [logistic regression](https://en.wikipedia.org/wiki/Logistic_regre...
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- 25 Feb at 21:14
HttpClient - A task was cancelled?
It works fine when have one or two tasks however throws an error "A task was cancelled" when we have more than one task listed.  `...
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- 16 Mar at 22:22
Android Emulator Error Message: "PANIC: Missing emulator engine program for 'x86' CPUS."
I am trying to run a Android Emulator by using AVD Manager. this is my avd: [http://image-upload.de/image/fnx79V/52b0d050ee.png](http://image-upload.de/image/fnx79V/52b0d050ee.png) and this is what h...
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- 13 Apr at 10:6
Remote debugging Tomcat with Eclipse
I can't seem to debug the tomcat application through Eclipse. I've set `CATALINA_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n` and then I run `bin/catalina.sh`, where...
Odd behavior when Java converts int to byte?
``` int i =132; byte b =(byte)i; System.out.println(b); ``` Mindboggling. Why is the output `-124`?
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- 28 May at 23:40