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In computing, a fixedpoint number representation is a real data type for a number that has a fixed number of digits after the decimal (or binary or hexadecimal) point. For example, a fixedpoint number with 4 digits after the decimal point could be used to store numbers such as 1.3467, 281243.3234 and 0.1000, but would round 1.0301789 to 1.0302 and 0.0000654 to 0.0001. These fixedpoint presentations are usually used, if either the executing processor does not have any floating point unit (FPU) or performance outrules exactness.
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