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A-level Computing/AQA/Paper 2/Fundamentals of data representation/Binary number system/Binary fractions
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Binary Fractions using Fixed Point
Fixed point is a method used to represent a fractional number in binary form. This means that it can be used to represent number such as 2 & 1/2 or 6 & 15/16. This section shows how fixed point can represent fractional numbers.
Assume we want to convert the binary code 110001102 into decimal using fixed point:
Step 1
Write out the decimal (or denary, if you prefer) equivalent as show:
. 1 1 0 0 0 1 1 0
Step 2
Add the numbers together so in this case: 8+4+1/4+1/8 = 12 & 3/8