unit1.pas

本光盘是《Delphi 7应用教程》一书的配套光盘

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
Const
   M=3;    //常量，表示人数
   N=5;    //常量表示课程门数
Var
   Cj:array[1..M,1..N+1] of integer;//记录学号和成绩的数组
   Aver:Array[1..M] of real; //存放平均成绩的数组


{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
   i,j,x,y:integer;
begin
   Randomize;  //随机数初值化
   For i:=1 to M do
     begin
      Cj[i,1]:=i;//生成学号
      For j:=2 to N+1 do
           Cj[i,j]:=Trunc(90*Random+10);//生成每个学生的每门课成绩
     end;
   Form1.Canvas.textout(1,1,'学号    成绩1   成绩2   成绩3   成绩4   成绩5  平均分');
   For i:= 1 to M  do //此二重循环用来输出学生的学号与各门课成绩
      For j:=1 to N+1 do
         begin
           x:=(j-1)*40;y:=(i)*20;
           Form1.Canvas.textout(x,y,inttostr(Cj[i,j]));
         end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  i,j:integer;
begin
    For i := 1 To M do  //此循环用来求出每个学生的各门课的平均分
      begin
          Aver[i]:=0;
          For j:= 2 To N + 1  do
               Aver[i] := Aver[i] + Cj[i, j];
          Aver[i]:=Aver[i]/N;
          Form1.Canvas.textout((N+1)*40,i*20,Floattostr(Aver[i]));
      end;

end;

end.