How many bits is a “word”?

I’m not familiar with either of these books, but the second is closer to current reality. The first may be discussing a specific processor. Processors have been made with quite a variety of word sizes, not always a multiple of 8. The 8086 and 8087 processors used 16 bit words, and it’s likely this is … Read more

Reading from file in c++ ifstream

What the inFile >> S does is take in the file stream, which is the data in you file, and uses a space delimiter (breaks it up by whitespace) and puts the contents in the variable S. For example: If we had a file that had the follow contents and we used inFile >> S with our file: we … Read more

How do I vertically center text with CSS?

You can try this basic approach:  Run code snippetExpand snippet It only works for a single line of text though, because we set the line’s height to the same height as the containing box element. A more versatile approach This is another way to align text vertically. This solution will work for a single line … Read more

Virtual/pure virtual explained

From Wikipedia’s Virtual function … In object-oriented programming, in languages such as C++, and Object Pascal, a virtual function or virtual method is an inheritable and overridable function or method for which dynamic dispatch is facilitated. This concept is an important part of the (runtime) polymorphism portion of object-oriented programming (OOP). In short, a virtual function defines … Read more

What is the best Scheme interpreter or compiler?

For a beginner, I would highly recommend DrRacket (formerly Dr. Scheme), since it gives you a really nice environment to work in, supports many dialects of Scheme, and gives very good failure and debugging information. I believe most implementations of Scheme are interpreters, although it is possible that there is a compiler out there. If you are … Read more

All possible array initialization syntaxes

These are the current declaration and initialization methods for a simple array. Note that other techniques of obtaining arrays exist, such as the Linq ToArray() extensions on IEnumerable<T>. Also note that in the declarations above, the first two could replace the string[] on the left with var (C# 3+), as the information on the right is enough to infer the proper type. … Read more

How to parse XML and count instances of a particular node attribute?

I suggest ElementTree. There are other compatible implementations of the same API, such as lxml, and cElementTree in the Python standard library itself; but, in this context, what they chiefly add is even more speed — the ease of programming part depends on the API, which ElementTree defines. First build an Element instance root from the XML, e.g. with the XML function, or by parsing … Read more

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