This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)


is the head used for real (floating-point) numbers.
  • _Real can be used to stand for a real number in a pattern.
  • You can enter a floating-point number of any length.
  • You can enter a number in scientific notation by using the form mantissa*^exponent.
  • You can enter a floating-point number in base b using b^^digits. The base must be less than 36. The letters a-z or A-Z are used in sequence to stand for digits 10 through 35.
  • Real is also used to indicate an approximate real number in Read.
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