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Does function created in C take some of memory?

Posted on 1998-09-06
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Last Modified: 2010-04-10
Hello experts,

As I am novice to C, so I would like to ask if a recursive function created in MSVC++ occupy some of the memory spaces. If yes, how woul I clear out this function after I have use it.
By the way, does recursive function able to cause the exhaustive memory in computer..?

Thank You for the help...
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Question by:dekoay
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LucHoltkamp earned 90 total points
ID: 1172113
In fact it does..
When the function is executed it's returnadress is saved on stack, also room for it's parameters is reserved on stack.
Because the stack is normally not as large as main memory (1 MB in win95) a stack overflow is possible, if your recursive function calls itself many times (10 of thousends in win95, but it depends on the size of your parameters).
Notice that under DOS (16 bits) the stack size is normally not larger then 64 k. So a stackoverflow is much more likely.
luc.
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by:newexpert
ID: 1172114
Any code will take up memory spaces.  Code memory is managed by the operating system therefore you don't need to worry about it.

Any function will use stack and/or heap for working.  Stack is automatically cleaned up by the function after exiting, dynamic heap needs to be freed by you (just use delete operator on anything that was created by new operator).

If you have a run-away recursive function the memory (probably on the stack) will quickly run out.  In some circumstances you get a segment violation. You can also get a stack-heap collision, and corrupt heap data, if stack and heap shares the same memory segment.
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by:dekoay
ID: 1172115
Is there a way I can delete certain functions from the stack so there I can reuse the free space.
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