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# Floating point numbers Watch

1. I'm kind of stuck on this question from the AQA Comp 3 exam style question booklet.

"The number 0111 0010 1011 1101 is stored in two's compliment notation in 16 bits with the most significant 6 bits representing the exponent.

Estimate the magnitude of this number. >232, between 216 and 232, between 22 and 2-2 or <2-2."

The answer is <2-2 but I don't know how you're supposed to know that without working it out? Any help would be appreciated.
2. You picked the last 6 bits as the exponent?

I'm doing the booklet too, but I thought the MSBs were always the first bits? I picked the first 6 as the exponent and guessed at 'between 2^16 and 2^32' lol....maybe Im wrong
3. Oh ffs...wait I just looked at it now, I forgot the mantissa is two's complement too -.- yeah you're right because the number is negative :P
4. (Original post by Sienne)
Oh ffs...wait I just looked at it now, I forgot the mantissa is two's complement too -.- yeah you're right because the number is negative :P
This might be of some help with practice: http://en.wikibooks.org/wiki/A-level..._point_numbers

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Updated: April 15, 2013
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