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Difference between ref and out parameters in .NET [duplicate]

What is the difference between ref and out parameters in .NET? What are the situations where one can be more useful than the other? What would be a code snippet where one can be used and another can't? ...
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When should I use malloc in C and when don't I?

I understand how malloc() works. My question is, I'll see things like this: 6 Answers ...
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versionCode vs versionName in Android Manifest

... Reference Link android:versionCode An internal version number. This number is used only to determine whether one version is more recent than another, with higher numbers indicating more recent versions. This is not the version number shown to users; that number is set by the versionName at...
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Select text on input focus

... The way to do this in Angular is to create a custom directive which does the autoselect for you. module.directive('selectOnClick', ['$window', function ($window) { return { restrict: 'A', link: function (scope, element, ...
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How do I concatenate const/literal strings in C?

...ing pointed to by dest: char *strcat(char *dest, const char *src); Here is an example from cplusplus.com: char str[80]; strcpy(str, "these "); strcat(str, "strings "); strcat(str, "are "); strcat(str, "concatenated."); For the first parameter, you need to provide the destination buffer itself....
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Remove rows with all or some NAs (missing values) in data.frame

I'd like to remove the lines in this data frame that: 16 Answers 16 ...
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javac option to compile all java files under a given directory recursively

...ing the javac compiler to compile java files in my project. The files are distributed over several packages like this: com.vistas.util , com.vistas.converter , com.vistas.LineHelper , com.current.mdcontect . ...
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Any implementation of Ordered Set in Java?

If anybody is familiar with Objective-C there is a collection called NSOrderedSet that acts as Set and its items can be accessed as an Array 's ones. ...
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What is the difference between Class.getResource() and ClassLoader.getResource()?

I wonder what the difference is between Class.getResource() and ClassLoader.getResource() ? 7 Answers ...
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In Django - Model Inheritance - Does it allow you to override a parent model's attribute?

I'm looking to do this: 10 Answers 10 ...