Real
float, double and long double (keywords)

 Real number data types

  Type        Length              Range

  float               32 bits           3.4 * (10**-38) to 3.4 * (10**+38)
  double           64 bits           1.7 * (10**-308) to 1.7 * (10**+308)
  long double    80 bits           3.4 * (10**-4932) to 1.1 * (10**+4932)

Use of double or float requires linking in the floating-point math package.

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