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Why do we need virtual functions in C++?

I'm learning C++ and I'm just getting into virtual functions. 26 Answers 26 ...
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Facebook Graph API v2.0+ - /me/friends returns empty, or only friends who also use my application

I am trying to get my friend name and ids with Graph API v2.0, but data returns empty: 7 Answers ...
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File input 'accept' attribute - is it useful?

Implementing a file upload under html is fairly simple, but I just noticed that there is an 'accept' attribute that can be added to the <input type="file" ...> tag. ...
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How to implement Rate It feature in Android App

I am developing an Android App. In which everything is working right. My app is ready to launch. But there I need to implement one more feature. I need to display a popup which contains ...
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Where to host an Open Source Project: CodePlex, Google Code, SourceForge? [closed]

I have been reading through the backlog of answered questions on SO regarding "How to promote an open source project". Not surprisingly, many of the answers pointed people to SoureForge/FreshMeat and other sites etc as well as blogging and whatnot. This started me thinking where is the best place to...
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performSelector may cause a leak because its selector is unknown

I'm getting the following warning by the ARC compiler: 19 Answers 19 ...
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Learn C first before learning Objective-C [closed]

Being an aspiring Apple developer, I want to get the opinions of the community if it is better to learn C first before moving into Objective-C and ultimately the Cocoa Framework? ...
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CSS: fixed position on x-axis but not y?

Is there a way to fix a position on the x-axis only? So when a user scrolls up, the div tag will scroll up with it, but not side to side? ...
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How can the Euclidean distance be calculated with NumPy?

I have two points in 3D: 22 Answers 22 ...
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Is mathematics necessary for programming? [closed]

I happened to debate with a friend during college days whether advanced mathematics is necessary for any veteran programmer. He used to argue fiercely against that. He said that programmers need only basic mathematical knowledge from high school or fresh year college math, no more no less, and that ...