使用delphi计算出数学公式

[H20986]

如何用Delphi来实现这个公式计算

[日立奔腾浪潮微软松下联想]

并不复杂，加减乘除乘方开方对数

[DelphixpeFan]

unit TestCalMathMain;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, cxGraphics, cxControls, cxLookAndFeels, cxLookAndFeelPainters,
  cxContainer, cxEdit, StdCtrls, cxTextEdit, cxMaskEdit, cxSpinEdit, acPNG,
  ExtCtrls;

type
  TForm1 = class(TForm)
    Image1: TImage;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    cxSpinEdit_S: TcxSpinEdit;
    cxSpinEdit_L: TcxSpinEdit;
    cxSpinEdit_r: TcxSpinEdit;
    cxSpinEdit_σ: TcxSpinEdit;
    cxSpinEdit_T: TcxSpinEdit;
    Button1: TButton;
    Label_d1: TLabel;
    Label_d2: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  d1, d2: Double;
begin
  d1 := (ln(cxSpinEdit_S.Value / cxSpinEdit_L.Value) + ((cxSpinEdit_r.Value + (0.5 * sqr(cxSpinEdit_σ.Value)))
        * cxSpinEdit_T.Value)) / (cxSpinEdit_σ.Value * sqrt(cxSpinEdit_T.Value));
  Label_d1.Caption := format('d1 = %.4f', [d1]);
  d2 := (ln(cxSpinEdit_S.Value / cxSpinEdit_L.Value) + ((cxSpinEdit_r.Value - (0.5 * sqr(cxSpinEdit_σ.Value)))
        * cxSpinEdit_T.Value)) / (cxSpinEdit_σ.Value * sqrt(cxSpinEdit_T.Value));
  Label_d2.Caption := format('d2 = %.4f', [d2]);
end;

[hongss]

就是把公式翻译成Delphi语句的过程