how compiler decide the range of real numbers in C...

Say 16 bit compiler (for ex Turbo C) uses 2's compliment to find the range of
signed integer.
Say for 16 bit n=16. Now applying 2's compliment equation : -2^(n-1)  to
2^(n-1) -1
so for n=16 : The range is -32768 to 32767

This is ok. The question arises when it tell about real constant's range.
For 16 bit compiler the range of real constant is : -3.4e38 to 3.4e38

How they arrived to this real constant range?

Can any one share the mathematical calculation behind it?

thnx,
RAM_LOCK


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