procedure declarations 3

[dik]

I'm doing a little programming in Delphi, having been away from it for 15 years or more, and, I'm having a problem. It has to do with the location and declaration of procedures within a form. the procedures are loaded when the form is created. The basic source, reduced for size is below: I've spent all day and end up with from 7 to 40 compile errors.
Does anyone see anything obviously out of whack with the placement or declaration of the procedures? and can anyone suggest why the Case faults on ItemIndex 2?

Thanks, Dik
--------------------------------- Begin Code -------------------------------------------

unit Main_Screen;

interface

uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
TMain_ScreenF = class(TForm)
Question: TLabel;
Answer: TEdit;
Continue: TButton;
About: TButton;
Main_Screen: TLabel;

procedure FormCreate(Sender: TObject);
procedure AboutClick(Sender: TObject);
procedure FormActivate(Sender: TObject);
procedure AddRand(add1:integer; add2:integer ;sum:integer);
procedure SubRand (minu:integer; subt:integer; diff:integer);
procedure MulRand (mulp:integer; mull:integer; prod:integer);
procedure DivRand (divd:integer; divs:integer; quo:integer);
procedure EqualRand (num1:integer; num2:integer; eqal:integer; logi:integer);

I get compile errors no matter where I place these


private
{ Private declarations }
public
{ Public declarations }
end;

var
Main_ScreenF: TMain_ScreenF;
maxadd, maxsub, maxmul, maxdiv, maxans: integer;
dummy: string;
config: TextFile;
These are global variables

implementation

{$R *.DFM}

uses
Practice, About, Configuration;

var
add1, add2, sum, minu, subt, diff, mulp, mull, prod, divd, divs, quo, num1, num2, eqal, logi: integer;

These are variables local to the form

procedure TMain_ScreenF.FormCreate(Sender: TObject);
begin
Left:=(Screen.Width-Width) div 2; // center form
Top:=(Screen.Height-Height) div 2;
end;



procedure TMain_ScreenF.AboutClick(Sender: TObject);
begin
AboutF.ShowModal;
end;



procedure TMain_ScreenF.FormActivate(Sender: TObject);
var
equal: string;
begin
case PracticeF.RadioGroup1.ItemIndex of
1:
Begin
Main_ScreenF.Main_Screen.Caption := 'Addition Practice';
AddRand(add1; add2; sum); The compiler faults all the procedures: [dcc32 Error] Main_Screen.pas(74): E2035 Not enough actual parameters
[dcc32 Error] Main_Screen.pas(74): E2014 Statement expected, but expression of type 'Integer' found
Question.Caption := IntToStr(add1) + ' + ' + IntToStr(Add2) + ' =';
End;
2: The compiler faults this stating '[dcc32 Error] Main_Screen.pas(77): E2003 Undeclared identifier: '2', but lets the other 1 - 8 values stand'
Begin
Main_Screen.Caption := 'Subtraction Practice';
SubRand (minu; subt; diff);
Question.Caption := IntToStr(minu) + ' - ' + IntToStr(subt) + ' =';
End;
3:
Begin
Main_Screen.Caption := 'Greater Than - Less Than Practice';
EqualRand (num1; num2; eqal; logi);

if eqal = 1 then
equal := ' < '
else if eqal = 2 then
equal := ' = '
else if eqal = 3 then
equal := ' > ';

Question.Caption := IntToStr(num1) + equal + IntToStr(Add2);
End;
4:
Begin
Main_Screen.Caption := 'Addition and Subtraction Practice';
AddRand(add1; add2; sum);
SubRand (minu; subt; diff);
Question.Caption := IntToStr(add1) + ' + ' + IntToStr(Add2) + ' =';
Question.Caption := IntToStr(minu) + ' - ' + IntToStr(subt) + ' =';
End;
5:Begin
Main_Screen.Caption := 'Multiplication Practice'
MulRand (mulp; mull; prod);
Question.Caption := IntToStr(mulp) + ' X ' + IntToStr(mull) + ' =';
6:Begin
Main_Screen.Caption := 'Division Practice'
DivRand (divd; divs; quo);
Question.Caption := IntToStr(divd) + ' / ' + IntToStr(divs) + ' =';
7:Begin
Main_Screen.Caption := 'Multiplication and Division Practice'
MulRand (mulp; mull; prod);
Question.Caption := IntToStr(mulp) + ' X ' + IntToStr(mull) + ' =';
DivRand (divd; divs; quo);
Question.Caption := IntToStr(divd) + ' / ' + IntToStr(divs) + ' =';
End;
8:Begin
Main_Screen.Caption := 'Completely Mixed Combinations Practice'
AddRand(add1; add2; sum);
Question.Caption := IntToStr(add1) + ' + ' + IntToStr(Add2) + ' =';
SubRand (minu; subt; diff);
Question.Caption := IntToStr(minu) + ' - ' + IntToStr(subt) + ' =';
MulRand (mulp; mull; prod);
Question.Caption := IntToStr(mulp) + ' X ' + IntToStr(mull) + ' =';
DivRand (divd; divs; quo);
Question.Caption := IntToStr(divd) + ' / ' + IntToStr(divs) + ' =';

EqualRand (num1; num2; eqal; logi);

if eqal := 1 then
equal := ' < ';
else if eqal := 2 then
equal := ' = ';
else if eqal := 3 then
equal := ' > ';

Question.Caption := IntToStr(num1) + equal + IntToStr(Add2);
End;
End;



//** procedure AddRand ********************************************************
//
// Procedure determines two addends and provides the sum. The addends are
// individually less than the value maxadd and the sum is less than the
// value maxans%. These values are passed to the procedure by a COMMON
// SHARED statement.
//
// PARAMETERS: add1 = first addend
// add2 = second addend
// sum = sum of addends
//
procedure AddRand(add1:integer; add2:integer; sum:integer);
begin
randomize;
add1 := Random(maxadd + 1);

WHILE (sum > maxans) do
begin
add2 := Random(maxadd + 1);
sum := add1 + add2;
end;
end; This is a typical procedure...


//** procedure SubRand ********************************************************
//
// Procedure determines two numbers and provides the diference. The numbers
// are individually less than the value maxsub% and the difference is less
// than the value maxans%. These values are passed to the procedure by a
// COMMON SHARED statement.
//
// PARAMETERS: minu = minuend
// subt = subtrahend
// diff = minuend - subtrahend
//
procedure SubRand (minu:integer; subt:integer; diff:integer);
begin
randomize;

While subt > minu do
begin
minu := Random(maxsub + 1);
subt := Random(maxsub + 1);
diff := minu - subt;
end;
end;



//** procedure MulRand *******************************************************
//
// Procedure determines two numbers and provides the product. The numbers
// are individually less than the value maxmul% and the product is less than
// the value maxans%. These values are passed to the procedure by a COMMON
// SHARED statement.
//
// PARAMETERS: mulp = multiplier
// mull = multiplicand
// prod = product
//
procedure MulRand (mulp:integer; mull:integer; prod:integer);
Begin
randomize;
mull := Random(maxmul + 1);

While prod > maxans do
begin
mulp := Random(maxmul + 1);
prod := mull * mulp;
end;
end;



//** procedure DivRand *******************************************************
//
// Procedure determines a dividend and a divisor and provides the quotient.
// The numbers are individually less than the value maxdiv% and the quotient
// is not bounded, but with a normal value of maxdiv%, it is likely less
// than the value maxans%. These values are passed to the procedure by a
// COMMON SHARED statement.
//
// PARAMETERS:
// divd = dividend
// divs = divisor
// quo = quotient
//
procedure DivRand (divd:integer; divs:integer; quo:integer);
Begin
randomize;
quo := Random(maxdiv + 1);

While ((quo > maxdiv) OR (divs = 0)) do
begin
divs := Random(maxdiv + 1);
divd := quo * divs; // divd, divs, and quo are integers
end;
End;



//** procedure EqualRand ******************************************************
//
// Procedure randomly generates two numbers and determines the logical
// comparison between them using a random generated comparison. It returns
// two numbers, the equality sysbol, and and a logical true or false for the
// values generated. The maximum values are passed to the procedure by being
// in scope.
//
// PARAMETERS: num1 = first number
// num2 = Second number
// eqal = Random equality sysbol
// 1 denotes <
// 2 denotes =
// 3 denotes >
// logi = 1 denoted True
// 0 denotes False
//
procedure EqualRand (num1:integer; num2:integer; eqal:integer; logi:integer);
Begin
randomize;

num1 := Random(maxadd + 1);
num2 := Random(maxadd + 1);
eqal := Random(4);

if (num1 - num2) < 0 then
begin
logi := 1;
end
else if (num1 - num2) = 0 then
begin
logi := 2;
end
else if (num1 - num2) > 0 then
begin
logi := 3;
end;
end;

end.

 

[dik]

Thanks... I try to limit the scope of variables... the ones noted are from the configuration form that established upper limits for the problems.

Dik

 

[dik]

I'm holding off on finishing this for a bit... thanks very much for your assistance... I realised that it's time for a bit of a refresher and I'm currently going through Marco Cantu's Object Pascal Handbook for Berlin. About a third of the way through it, so far. I think I need the refresher more...

Thanks