Unit 'System' Package
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Ln

Calculate logarithm.

Declaration

Source position: mathh.inc line 127

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

Exp

  

Exponentiate.

Example

Program Example37;

{ Program to demonstrate the Ln function. }

begin
  Writeln (Ln(1));      { Prints 0 }
  Writeln (Ln(Exp(1))); { Prints 1 }
end.

Documentation generated on: Oct 02 2024