What do you mean by underflow and overflow of data. (2)
Ans:

Underflow and overflow of data:
When the value of the variable is either too long or too small for the data type to
hold, the problem of data overflow or underflow occurs. The largest value that a
variable can hold depends on the machine. Since floating point values are rounded
off to the number of significant digits allowed, an overflow results in the largest
possible real value whereas an underflow results in zero. C does not provide any
warning or indication of integer overflow, it simply give erroneous result.
Q.