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# numeric conversions

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What does FFFF FFF1 convert to in base 10?

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Hi, Otto
FFFF FFF1
7654 3210
FFFFFFF1 = 15*16^7+15*16^6+15*16^5+15*16^4+15*16^3+15*16^2+15*16^1+1*16^0
Jamal Hasanov
www.j-think.com

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I believe it converts to -15 in base 10.
Brian

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Originally posted by Brian Lugo:
I believe it converts to -15 in base 10.
Brian

Doesn't it depend if the number signed or unsigned?

Brian Lugo
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Thats very true Jessica, I assumed the number was a 32 bit signed integer (in Java) and not 32 bit float.
Brian

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Originally posted by Jessica Sant:

Doesn't it depend if the number signed or unsigned?

How a number is converted from Hex to Decimal is dependent upon if the number is signed or unsigned and also if the number is an integer value or a floating point value.
Obviously, whether the value is signed or unsigned lets us know whether the most significant bit is a data bit or a sign bit.
If you're dealing with a floating point value, part of that value is interpreted as an exponent. You can check out this thread for details about this.
However, for the exam, you'll probably be safe knowing how to convert signed ints between the various bases (dec, hex, oct, bin).
Corey

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