Doubt in number system

#1

when we change 00100000 which is stored in memory as binary so while changing it to decimal no why we start from 2 is to power 7 why not 8 and what is the role of most significant bit in storing binary number

#2

does every memory always have 8 bits only???

#3

Hi @harsh.hj,
The first bit of the MSB (Most significant bit) tells us about the sign of number … as a signed number can be positive as well as negative the first bit tells us whether it is + or - … IF the MSB is 1 then the sign is -ve else if it is 0 the sign is +ve … However if the number is unsigned then the MSB is taken to be default as +ve and the MSB is considered and we start from 2 to the power of 8 …
To answer your second question - no , memory does not always have 8 bits … 8 bit is used as an example…

#4

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