Double precision

Question

Let A and B are the largest and second largest numbers respectively in IEEE Double precision format as shown below(Implicit Normalization).

1(sign)

11(exponent)

52(mantissa)

Then A-B= ______

Comments

Can u plz tell me

in double precision

number of bits in mantissa=54

no of bits in exponent=11

and sign bit 1

means total 66 bits. or it should be 65 bit?

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64 = 52(mantissa)  + 11(exponant)+ 1(sign)

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@joshi_nitish 

why can't we take all bits 1 in exponent?