IEEE Standard 754 floating point is the most common representation today for real numbers on computers, including Intel-based PC’s, Macintoshes, and most Unix platforms. This article rules for positive and negative numbers pdf a brief overview of IEEE floating point and its representation. Discussion of arithmetic implementation may be found in the book mentioned at the bottom of this article.

There are several ways to represent real numbers on computers. Fixed point places a radix point somewhere in the middle of the digits, and is equivalent to using integers that represent portions of some unit. Another approach is to use rationals, and represent every number as the ratio of two integers. 456 could be represented as 1. 110 could be represented as 1.

Floating-point solves a number of representation problems. Fixed-point has a fixed window of representation, which limits it from representing both very large and very small numbers. Also, fixed-point is prone to a loss of precision when two large numbers are divided. Floating-point, on the other hand, employs a sort of “sliding window” of precision appropriate to the scale of the number.

This allows it to represent numbers from 1,000,000,000,000 to 0. 0 denotes a positive number, and 1 denotes a negative number. Flipping the value of this bit flips the sign of the number. To do this, a bias is added to the actual exponent in order to get the stored exponent. For IEEE single-precision floats, this value is 127.

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Thus, an exponent of zero means that 127 is stored in the exponent field. For double precision, the exponent field is 11 bits, and has a bias of 1023. To find out the value of the implicit leading bit, consider that any number can be expressed in scientific notation in many different ways. This basically puts the radix point after the first non-zero digit. In normalized form, five is represented as 5.

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