d4r15.txt

《Delphi常用数值算法集》的配书源码

implementation
//PROGRAM D4R15
//Driver for routine BESSJ0
uses
  unit2;
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
  ACTUAL:array[1..5] of real;X:array[1..5] of real;
  F:TextFile;  j:Integer;  
const
  s1='%8.2f';s2='%14.6f';
begin
  ACTUAL[1]:=-0.1775968;    ACTUAL[2]:=1;
  ACTUAL[3]:=-0.1775968;    ACTUAL[4]:=0.1716508;
  ACTUAL[5]:=0.1710735;
  X[1]:=-5;  X[2]:=0;
  X[3]:=5;   X[4]:=8;
  X[5]:=14;
  //输出计算结果到文件
  AssignFile(F, 'd:\delphi_shu\p4\d4r15.dat');
  Rewrite(F);
  Writeln(F, '     X         Actual       BESSJ0(X)');
  For j:= 1 To 5 do
  begin
    Writeln(F,Format(s1,[X[j]]),Format(s2,[Actual[j]]),
        Format(s2,[BESSJ0(X[J])]));
  end;
  CloseFile(F);
  //屏幕显示计算结果
  memo1.Lines.LoadFromFile('d:\delphi_shu\p4\d4r15.dat');
end;