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Wikipedia definition
1. Real data typeA real data type is a data type used in a computer program to represent an approximation of a real number. Because the real numbers are not countable, computers cannot represent them exactly using a finite amount of information. Most often, a computer will use a rational approximation to a real number.
Read “Real data type” on English Wikipedia
Read “実数型” on Japanese Wikipedia
Read “Real data type” on DBpedia

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