Delphi Basics : Exp command

DelphiBasics

Exp
Function

Gives the exponent of a number

System unit

function Exp(Number Extended):Extended;

Description

The Exp function takes an integer or floating point Number and raises e (2.72) to that power.

This is only used for mathematical processing.

Exp has the opposite effect to Ln - the natural logarithm.

Related commands

Ln		Gives the natural logarithm of a number
Log10		Gives the log to base 10 of a number

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Example code : Calculate the exponent of 2

var
  float : Double;
begin
  // Get the natural logarithm of 2
  float := Ln(2);

  // Show this value
  ShowMessage('Ln(2) = '+FloatToStr(float));

  // Get the exponent of this value - reverses the Ln operation
  float := Exp(float);

  // Show this value
  ShowMessage('Exp(Ln(2)) = '+FloatToStr(float));
end;

Show full unit code

Ln(2) = 0.693147180559945
Exp(Ln(2)) = 2