Floating point literals

A floating point literal represents a double-precision (64-bit) floating point number. It has three parts: an integer, a fraction, and an exponent.

  float :=  [0-9]* "." [0-9]+ ( [eE] [+-]? [0-9]+ )?

  x = 1.0;
  x = 3.14;
  x = .123;
  x = 3.14;
  x = 2.89e11;
  x = .34e-21;

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