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#### Ln

Declaration:
  Function Ln (X : Real) : Real;
Description:

  Ln returns the natural logarithm of the Real parameter X. X must be positive.

Errors:
  An run-time error will occur when X is negative.
See also:
  Exp (493), Power (547)

Listing: refex/ex37.pp

Program Example37;
{ Program to demonstrate the Ln function. }
begin
Writeln (Ln(1)); { Prints 0 }
Writeln (Ln(Exp(1))); { Prints 1 }
end.

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