Real
 Usage
• Real is the head used for real (floating-point) numbers.
Notes
• _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. • New in Version 1; modified in 3.
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