In C (or C++ for that matter), pointers are special if they have the value zero: I am adviced to set pointers to zero after freeing their memory, because it means freeing the pointer again isn't dangerous; when I call malloc it returns a pointer with the value zero if it can't get me memory; I use ...

Most operations in pandas can be accomplished with operator chaining ( groupby , aggregate , apply , etc), but the only way I've found to filter rows is via normal bracket indexing ...

I am fairly new to C programming, and I encountered bit masking. Can someone explain to me the general concept and function of bit masking? Examples are much appreciated. ...

... 4 Answers 4 Active ...

I can easily grant access to one IP using this code: 7 Answers 7 ...

I don't understand the rationale behind the decision of this part of Lua. Why does indexing start at 1? I have read (as many others did) this great paper . It seems to me a strange corner of a language that is very pleasant to learn and program. Don't get me wrong, Lua is just great but there has t...

You are given a large range [a,b] where 'a' and 'b' can be typically between 1 and 4,000,000,000 inclusive. You have to find out the XOR of all the numbers in the given range. ...

I'm using ASP.NET, some of my buttons just do redirects. I'd rather they were ordinary links, but I don't want my users to notice much difference in the appearance. I considered images wrapped by anchors, i.e. tags, but I don't want to have to fire up an image editor every time I change the text ...

Which image processing techniques could be used to implement an application that detects the Christmas trees displayed in the following images? ...

For a different question I composed this answer , including this sample code . 10 Answers ...