DelphiBasics
Log10
Function
Gives the log to base 10 of a number Math unit
 function Log10 ( const Number : Extended ) : Extended;
Description
The Log10 function returns the logarithm to base 10 of Number.
Related commands
Exp Gives the exponent of a number
Ln Gives the natural logarithm of a number
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Example code : Show the logarithm of a set of numbers
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
 
unit Unit1;
 
interface
 
uses
  Math,   // Unit containing the Log10 command
  SysUtils,
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  
Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);

begin
  // Show the Log to base 10 values of 3 numbers
  ShowMessage('Log10(1)  = '+FloatToStr(Log10(1)));
  ShowMessage('Log10(5)  = '+FloatToStr(Log10(5)));
  ShowMessage('Log10(10) = '+FloatToStr(Log10(10)));
end;
 
end.
Hide full unit code
   Log10(1)  = 0
   Log10(5)  = 0.698970004336019
   Log10(10) = 1
 
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