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Underflow and Overflow

Introduction
Overflow and underflow are general terms. They describe the situation when something becomes too big or too small to be processed correctly or stored in the space allocated to it correctly.

Overflow and underflow examples
If you have a fixed-size data structure such as a stack that has been set up to hold twenty data items, and you try to add a twenty first data item, this will cause a 'stack overflow' error. This is because the data structure is not big enough to hold the extra piece of data you are trying to add to it. 

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