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Fraction is an experimental fraction library for the Arduino. The code is working with a number of limitations among others: - denominator is max 4 digits to keep code for multiply and divide simple - therefore not all fractions are exact - the range of numbers supported is limited. That said, the library is useful e.g. to display float numbers as a fraction. From programming point of view the fractionize function, converting a double into a fraction is a nice programming problem, fast with a minimal error. In short, use fractions with care otherwise your sketch might get broken ;)