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However, this is a lame, almost pointless example because it can easily be replaced by more efficient iteration.
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The most simple example is tail recursion where the very last line of the function is a call to itself: int FloorByTen(int num) As with anything there are good uses and bad uses for recursion. Whenever a function calls itself, creating a loop, then that's recursion.
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** By the way Mario, the typical name for your ArrangeString function is "join", and I'd be surprised if your language of choice doesn't already have an implementation of it. I just don't think that recursion is generally a good idea in languages that aren't tuned for it. My favorite static language doesn't use loops at all, recursion is the only way to do something repeatedly. Regrettably, few imperative language-implementations have tail-call optimization built in. Put succinctly: if a function's return expression is simply the result of a function call, then you don't need to add a new level onto the stack, you can reuse the current one for the function being called. There is a technique that language implementers can use called tail call optimization which can eliminate some classes of stack overflow.
#RECURSIVE BOOKMARK SORTER DOES NOT OPEN HOW TO#
In general, code written recursively is shorter and a bit more elegant, once you know how to read it. There are still some arguments for using it though. So in these languages recursion is slower and it makes you vulnerable to crashing. When many programs start, they allocate a single chunk of memory for their stack, and when they run out of that memory (often, but not always due to recursion), the program crashes due to a stack overflow. control jumps back to where the function was calledÄoing all of these steps takes time, usually a little bit more than it takes to iterate through a loop.the stack is rewound to its previous position.the function's result is copied into a return value.the function's arguments are copied into this new space.space is carved out on the stack for the function's arguments and local variables.To see why, walk through the steps that the above languages use to call a function: every major implementation of C, C++, Basic, Python, Ruby,Java, and C#) iteration is vastly preferable to recursion. There are a number of good explanations of recursion in this thread, this answer is about why you shouldn't use it in most languages.* In the majority of major imperative language implementations (i.e.