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Q. Binary floating-point number range?
Smallest Negative number
Maximum mantissa and maximum exponent
= - (1 -2-24) × 2127
Largest negative number
Minimum mantissa and Minimum exponent
= -0.5 × 2-128
Smallest positive number
= 0.5 × 2-128
Largest positive number
= (1 -2-24) × 2127
Figure: Binary floating-point number range for given 32 bit format
In floating point numbers basic transaction is between range of numbers and accuracy also known as precision of numbers. If we raise exponent bits in 32-bit format then range can be increased but accuracy of numbers would go down as size of mantissa would become smaller. Let's have an illustration that will elucidate term precision. Suppose we have one bit binary mantissa then we would be able to represent only 0.10 and 0.11 in normalised form as provided in above illustration (having an implicit 1). Values like 0.101, 0.1011 and so on can't be represented like complete numbers. Either they have to be estimated or truncated and would be represented as either 0.10 or 0.11. So it will produce a truncation or round off error. The higher the number of bits in mantissa better would be precision.
In case of floating point numbers for raising both precision and range more bits are required. This can be obtained by employing double precision numbers. A double precision format is generally of 64 bits.
Institute of Electrical and Electronics Engineers (IEEE) is a group that has created many standards in aspect of various aspects of computer has created IEEE standard 754 for floating-point representation and arithmetic. Fundamental aim of developing this standard was to facilitate portability of programs from one to another computer. This standard has resulted in growth of standard numerical capabilities in different microprocessors. This representation is displayed in figure below.
Figure: IEEE Standard 754 format
compare 2g , 3g , and 4g also with advantage of 3g and 4g.
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