unit1.~pas

这个也是我们在课程中一起做的

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Edit2: TEdit;
    Label4: TLabel;
    Label5: TLabel;
    Edit3: TEdit;
    Label6: TLabel;
    Label7: TLabel;
    Button1: TButton;
    Label8: TLabel;
    Edit4: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
a,b,c,temp,x1,x2: real;
begin
  a:=strtofloat(edit1.Text);
  b:=strtofloat(edit2.Text);
  c:=strtofloat(edit3.Text);
  temp:=sqr(b)-4*a*c;
  if (a=0) and (b<>0) then
  begin
    x1:=-c/b;
    edit4.text:='只有一个解:'+format('%5.2f',[x1]);
  end;

end;

end.