unit unit1;

interface

uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls, Buttons, ExtCtrls;

type

TTForm1 = class(TForm)

Edit1: TEdit;

Edit2: TEdit;

Edit3: TEdit;

Edit4: TEdit;

Label1: TLabel;

Label2: TLabel;

Label3: TLabel;

Label4: TLabel;

Label5: TLabel;

Memo1: TMemo;

Button1: TButton;

Button3: TButton;

Splitter1: TSplitter;

Button5: TButton;

BitBtn1: TBitBtn;

SaveDialog1: TSaveDialog;

Button2: TButton;

OpenDialog1: TOpenDialog;

Button4: TButton;

 procedure FormCreate(Sender: TObject);

 procedure Button1Click(Sender: TObject);

 procedure Button2Click(Sender: TObject);

 procedure Button3Click(Sender: TObject);

 procedure Button4Click(Sender: TObject);

 procedure Button5Click(Sender: TObject);

 procedure BitBtn1Click(Sender: TObject);

 private { Private declarations }

 public { Public declarations }

 end;

 Type

TStudent = record

FIO: string[40];// Ïîëå ô.è.î.

otc: array[1..3] of word;// Ïîëå ìàññèâà îöåíîê

sball : extended; // Ïîëå ñðåäíåãî áàëëà

 end;

var

Fz : file of Tstudent;// Ôàéë òèïà çàïèñü

Ft : TextFile;// Òåêñòîâîé ôàéë

Stud : array[1..100] of Tstudent;// Ìàññèâ çàïèñåé

nzap : integer;// Íîìåð çàïèñè

FileNameZ, FileNameT : string; // Èìÿ ôàéëà

var

TForm1: TTForm1;

implementation

{$R *.DFM}

procedure TTForm1.FormCreate(Sender: TObject);

begin

Edit1.Clear; Edit2.Clear; Edit3.Clear; Edit4.Clear;

 Memo1.Clear;

Button1.Hide;// Ñäåëàòü íåâèäèìîé êíîïêó “Ââåñòè çàïèñü”

 nzap:=0;

end;

 

procedure TTForm1.Button1Click(Sender: TObject); // Ââåñòè íîâóþ çàïèñü

begin

nzap:=nzap+1;

with stud[nzap] do begin

FIO:=Edit1.Text;

otc[1]:=StrToInt(Edit2.Text);

otc[2]:=StrToInt(Edit3.Text);

otc[3]:=StrToInt(Edit4.Text);

sball:=(otc[1]+otc[2]+otc[3])/3;

Memo1.Lines.Add(fio+’ ‘+IntToStr(otc[1])+’ ‘+ IntToStr(otc[2])+

’ ‘+IntToStr(otc[3]));

 end;

Write(fz,Stud[nzap]);// Çàïèñü â ôàéë

Edit1.Clear; Edit2.Clear; Edit3.Clear; Edit4.Clear;

end;

procedure TTForm1.Button2Click(Sender: TObject); //Ñîçäàíèå íîâîãî

begin  // ôàéëà çàïèñåé

OpenDialog1.Title :=’Ñîçäàòü íîâûé ôàéë’; // Èçìåíåíèå çàãîëîâêà

//îêíà äèàëîãà

 if OpenDialog1.Execute then // Âûïîëíåíèå ñòàíäàðòíîãî äèàëîãà

 begin// âûáîðà èìåíè ôàéëà

FileNameZ:= OpenDialog1.FileName; // Âîçâðàùåíèå èìåíè

// äèñêîâîãî ôàéëà

AssignFile(Fz, FileNameZ); // Ñâÿçûâàíèå ôàéëîâîé ïåðåìåííîé Fz

// c èìåíåì ôàéëà

Rewrite(Fz); // Ñîçäàíèå íîâîãî ôàéëà

 end;

Button1.Show; // Ñäåëàòü âèäèìîé êíîïêó “Ââåñòè çàïèñü”

end;

 

procedure TTForm1.Button3Click(Sender: TObject); // Îòêðûòü

begin  // ñóùåñòâóþùèé ôàéë

 if OpenDialog1.Execute then // Âûïîëíåíèå ñòàíäàðòíîãî äèàëîãà

 begin// âûáîðà èìåíè ôàéëà

 FileNameZ:= OpenDialog1.FileName; // Âîçâðàùåíèå èìåíè

äèñêîâîãî ôàéëà

AssignFile(Fz, FileNameZ); // Ñâÿçûâàíèå ôàéëîâîé ïåðåìåííîé Fz

// c èìåíåì ôàéëà

Reset(Fz); // Îòêðûòèå ñóùåñòâóþùåãî ôàéëà

 end;

nzap:=0;

while not eof(fz) do begin 

nzap:=nzap+1;

Read(fz,stud[nzap]); // ×òåíèå çàïèñè èç ôàéëà

with stud[nzap] do

Memo1.Lines.Add(fio+’ ‘+IntToStr(otc[1])+’ ‘+IntToStr(otc[2])+

 ’ ‘+IntToStr(otc[3]));

 end;

 Button1.Show; // Ñäåëàòü âèäèìîé êíîïêó “Ââåñòè çàïèñü”

end;

 

procedure TTForm1.Button4Click(Sender: TObject); // Ñîðòèðîâêà çàïèñåé

 var i,j : word;

st : TStudent;

begin

for i:=1 to nzap-1 do // Ñîðòèðîâêà ìàññèâà çàïèñåé

for j:=i+1 to nzap do

 if Stud[i].sball < Stud[j].sball then begin

st:=Stud[i];

Stud[i]:=Stud[j];

Stud[j]:=st;

 end;

Memo1.Clear;

 for i:=1 to nzap do // Âûâîä â îêíî Memo1 îòñîðòèðîâàííûõ çàïèñåé

 with stud[i] do

Memo1.Lines.Add(IntToStr(i)+’ ‘+fio+’ ‘+FloatToStrf(sball,fffixed,4,2));

end;

 

procedure TTForm1.Button5Click(Sender: TObject); // Ñîõðàíåíèå  var i:word;// ðåçóëüòàòîâ ñîðòèðîâêè â òåêñòîâîì ôàéëå

begin

 if SaveDialog1.Execute then // Âûïîëíåíèå ñòàíäàðòíîãî äèàëîãà 

 begin// âûáîðà èìåíè ôàéëà

 FileNameT:= SaveDialog1.FileName; // Âîçâðàùåíèå èìåíè

// äèñêîâîãî ôàéëà

AssignFile(Ft, FileNameT); // Ñâÿçûâàíèå ôàéëîâîé ïåðåìåííîé Ft c

// èìåíåì ôàéëà

Rewrite(Ft); // Îòêðûòèå íîâîãî òåêñòîâîãî ôàéëà

 end;

for i:=1 to nzap do

with stud[i] do Writeln(Ft,i:4,’. ‘,fio,sball:8:2); // Çàïèñü â

// òåêñòîâîé ôàéë

CloseFile(Ft); // Çàêðûòèå òåêñòîâîãî ôàéëà

end;

 

procedure TTForm1.BitBtn1Click(Sender: TObject);

begin 

CloseFile(fz); // Çàêðûòèå ôàéëà çàïèñåé ïðè íàæàòèè íà êíîïêó “Ñlose”

end;

 

end.