Determine the decimal value of the following Floating point number:11001000101010000000000000000000
Question
Determine the decimal value of the following Floating point number:
11001000101010000000000000000000
Solution
The given binary string represents a floating point number in IEEE 754 single-precision format. This format is made up of three parts: the sign bit, the exponent, and the mantissa (or fraction).
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Sign bit: The first bit is the sign bit. If the sign bit is 0, the number is positive. If it's 1, the number is negative. In this case, the sign bit is 1, so the number is negative.
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Exponent: The next 8 bits are the exponent, expressed as a binary number. In this case, the exponent is 10010001, which is 145 in decimal. However, the IEEE 754 format uses a bias of 127 for the exponent, so we have to subtract 127 from the exponent to get the actual value. So, the actual exponent is 145 - 127 = 18.
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Mantissa: The remaining 23 bits are the mantissa. In this case, the mantissa is 01010000000000000000000. To get the value of the mantissa, we place a decimal point after the first bit and read the remaining bits as a binary fraction. So, the mantissa is 0.01010000000000000000000, which is 0.3125 in decimal.
Now, we can put all these parts together to get the value of the floating point number. The formula is (-1)^sign * 1.mantissa * 2^exponent. Plugging in the values we got:
(-1)^1 * 1.3125 * 2^18 = -340,000
So, the decimal value of the floating point number 11001000101010000000000000000000 is -340,000.
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