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Check that an email address is valid on iOS [duplicate]

I am developing an iPhone application where I need the user to give his email address at login. 4 Answers ...
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Bootstrap carousel multiple frames at once

This is the effect I'm trying to achieve with Bootstrap 3 carousel 14 Answers 14 ...
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What is the smallest possible valid PDF?

Out of simple curiosity, having seen the smallest GIF , what is the smallest possible valid PDF file? 4 Answers ...
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Floating elements within a div, floats outside of div. Why?

Say you have a div , give it a definite width and put elements in it, in my case an img and another div . 10 Answers...
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Why does the indexing start with zero in 'C'?

Why does the indexing in an array start with zero in C and not with 1? 16 Answers 16 ...
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Why is printing to stdout so slow? Can it be sped up?

I've always been amazed/frustrated with how long it takes to simply output to the terminal with a print statement. After some recent painfully slow logging I decided to look into it and was quite surprised to find that almost all the time spent is waiting for the terminal to process the results. ...
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Best way to format integer as string with leading zeros? [duplicate]

I need to add leading zeros to integer to make a string with defined quantity of digits ($cnt). What the best way to translate this simple function from PHP to Python: ...
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Why use strong named assemblies?

What are the advantages of using strong named assemblies? 4 Answers 4 ...
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round() for float in C++

I need a simple floating point rounding function, thus: 22 Answers 22 ...
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What's quicker and better to determine if an array key exists in PHP?

Consider these 2 examples... 10 Answers 10 ...