let us say 43252
it can be expressed as
4.3252 × 10^4
4.3252 is called the significand
in 10^4, 4 is called the exponent
a typical representation is
sign | exponent | significand
sign is one bit 0 or 1
in 32 bits,
1 bit for sign
8 bits for exponent
rest for significand

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