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Colt1911 [192]
3 years ago
10

Write down the bit pattern in the fraction of value 1/3 assuming a floating point format that uses Binary Coded Decimal (base 10

) numbers in the fraction instead of base 2. Assume there are 24 bits, and you do not need to normalize. Is this representation exact?
Computers and Technology
1 answer:
vekshin13 years ago
8 0

Answer:

The resulting floating bit representation is:

0 00101010101010101 000001                 (24 bits)

Explanation:

Converting 1/3 in decimal: 0.3333...

For converting decimal number into binary we know that the digits on the left of decimal are multiplied with positive powers of 2 (starting from zero) while digit on right side are multiplied with negative powers of  2 (starting from -1).

For example: The number 123.45 (decimal) is equal to:  

=1 * 10^2 + 2 * 10^1 + 3 * 10^0 + 4 * 10^-1 + 5 * 10^-2

=1 * 100 + 2 * 10 + 3 * 1 + 4 * 0.1 + 5 * 0.01

Now for the decimal number 0.3333... the pattern becomes:

0*0 . 3*2^-1+3^-2+3^-3+3^-4.....

The first negative power (2^-1 = 0.5) is too large to fit. The next one is 2^-2 = 0.25 and it fits, so let's subtract that: 0.3333… - 0.25 = 0.08333… The next power that fits is 2^-4 = 0.0625. Subtracting that from the remaining result we get 0.08333…- 0.0625 = 0.0208333…

Continuing on this line we get:

0.3333333…. (decimal) = 0.0101010101010101….. (binary)

Now for creating a 24 bit floating point format that uses Binary Coded Decimal we have to assign bits as follows:

  • 6 bits for the exponent
  • 17 bits for the mantissa.
  • In this case the sign bit is 0 (1 bit) because the number is non-negative.

As we need not to normalize obtained number, then the exponent will be simply 1, and the mantissa remains: 00101010101010101...

Now

The mantissa is 0.0101010101010101 (17 bits)

The exponent is 000001 (6 bits).

The resulting floating bit representation is 0 00101010101010101 000001

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