# Floating Point (AQA A2 COMPUTING)

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16 years ago
#1
Hi i was wondering if someone could possibly help me on floating point. how do you translate from floating point to decimal and how can you tell how many places to move the binary point using the exponent. thanks the help would be much appreciated
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16 years ago
#2
Originally posted by Unregistered
Hi i was wondering if someone could possibly help me on floating point. how do you translate from floating point to decimal and how can you tell how many places to move the binary point using the exponent. thanks the help would be much appreciated
If you have the computing book Heathcote then all this information is on chapter 42.

heres an example of floating point numbers:

128 64 32 16 8 4 2 1 . ½ 1/4 1/8 1/16
--------------------------------------------------------------
1 0 0 0 1 0 0 0 . 1 1 0 0

so 128 + 1/2 + 1/4 = 136.75

1,200,000,000,000 can be written as 0.12 x 10^13

(10^13 = 10x10x10x10x10x10x10x10x10x10x10 x10x10)

0.12 is the mantissa
13 is the exponent

So the point is moved 13 places to the right.

Hope that helps.
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16 years ago
#3
<QUOTE> 13 is the exponent </QUOTE>
Wouldn't the exponent be 12?
1100
8421
8+4 = 12
0
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