: a flowing under : movement of water through subsurface material.

What is underflow and overflow?

Simply put, overflow and underflow happen when we assign a value that is out of range of the declared data type of the variable. If the (absolute) value is too big, we call it overflow, if the value is too small, we call it underflow.

What is underflow with example?

The term integer underflow is a condition in a computer program where the result of a calculation is a number of smaller absolute value than the computer can actually store in memory. For example, an 8-bit computer is capable of storing unsigned integers ranging from 0–255.