Ln

Calculate logarithm

Declaration

Source position: mathh.inc line 110

  function Ln(d: ValReal) : ValReal;

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

Example

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