?? unit1.pas
字號(hào):
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
//PROGRAM D2R3
//Driver for routine SPLINE
uses
unit2;
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
X,Y,Y2:array[0..20] of real;
YP1,YPN:real;
F:TextFile; I:Integer;
const
N=20; PI=3.1415926; s1='%12.6f'; s3='%6.2f';
begin
For I:=1 to N do
begin
X[I]:= I * PI / N;
Y[I]:= SIN(X[I]);
end;
//用三次樣條函數(shù)計(jì)算二階導(dǎo)數(shù)
YP1:= COS(X[1]);
YPN:= COS(X[N]);
SPLINE(X,Y,N,YP1,YPN,Y2);
//輸出計(jì)算結(jié)果到文件
AssignFile(F, 'd:\delphi_shu\p2\d2r3.dat');
Rewrite(F);
Writeln(F, 'Second-derivative for sin(x) from 0 to PI');
Writeln(F,' spline actual');
Writeln(F, ' angle 2nd deriv. 2nd deriv.');
for I:=1 To N do
Writeln(F,Format(s3,[X[I]]),' ',Format(s1,[Y2[I]]),' ',
Format(s1,[-SIN(X[I])]));
CloseFile(F);
//屏幕顯示計(jì)算結(jié)果
memo1.ScrollBars:=ssVertical;
memo1.Lines.LoadFromFile('d:\delphi_shu\p2\d2r3.dat');
end;
end.
?? 快捷鍵說(shuō)明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號(hào)
Ctrl + =
減小字號(hào)
Ctrl + -