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What is a Context Free Grammar?
Can someone explain to me what a context free grammar is? After looking at the Wikipedia entry and then the Wikipedia entry on formal grammar, I am left utterly and totally befuddled. Would someone be so kind as to explain what these things are?
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Difference between Fact table and Dimension table?
When reading a book for business objects, I came across the term- fact table and dimension table.
9 Answers
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Why should I prefer to use member initialization lists?
I'm partial to using member initialization lists with my constructors... but I've long since forgotten the reasons behind this...
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typedef struct vs struct definitions [duplicate]
I'm a beginner in C programming, but I was wondering what's the difference between using typedef when defining a structure versus not using typedef . It seems to me like there's really no difference, they accomplish the same goal.
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Why do python lists have pop() but not push()
Does anyone know why Python's list.append function is not called list.push given that there's already a list.pop that removes and returns the last element (that indexed at -1) and list.append semantic is consistent with that use?
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Is putting a div inside an anchor ever correct?
I've heard that putting a block element inside a inline element is a HTML sin:
14 Answers
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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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Why does Python code use len() function instead of a length method?
I know that python has a len() function that is used to determine the size of a string, but I was wondering why it's not a method of the string object.
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What is the difference between a pseudo-class and a pseudo-element in CSS?
Things like a:link or div::after ...
8 Answers
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When should null values of Boolean be used?
Java boolean allows values of true and false while Boolean allows true , false , and null . I have started to convert my boolean s to Boolean s. This can cause crashes in tests such as
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