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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Hi;

Do you know how to use them?

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

yes,but it takes so long!

anyway i noticed that the program acts weirdly around ones.

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Hi anonimnystefy;

I know it takes a long time. Debugging a program is a very personal thing. You have to single step through the program checking the variables after each step. Or go through your code by hand writing down what each line does. Seeing whether or not it actually does what you think it should. Then you will find the offending line. There is no other way.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

but,do you know why the program won't go to the next line?

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Hi;

Probably because your looping structure is not going throw every row like it is supposed to. Check your loops or your recursive subroutine.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

checked the loops,seem okay.

what's recursive subroutine?

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Just a term. A recursive program is one that calls itself. You must make sure you have a base case so that the recursion stops, else it will exhaust all your memory, crash or go on forever.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

well do you think it is correct?

i was just confused by the subroutine part.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

There is definitely an error somewhere. But you will not make much progress just by looking at it. That can help clean up syntax errors but the compiler usually spots them.

Perhaps your while loops are terminating prematurely. Is your input routine working? Have you checked?

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

input routine?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Yes, the one that accepts your sudoku problem.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

it looks good.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Not good enough! Put a print or display statement at the end of it to make sure it has the correct structure.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

did it.it loaded.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Which variables represent your row and columns?

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

i use a two-dimensional array for the values and variables i and j to run through them.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Are i and j cycling through 1 and 9? Put a display statement inside those loops and then run a test sudoku.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

i inputted a sudoku and it looks like it is calculating because i cannot type anything and nothing happens when i press enter,but could it mean anything else?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Did you put output statements to see what i and j are doing?

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

oh that's what you meant!

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Yes, or open up the debugger and see what is happening there.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

help me!

Here lies the reader who will never open this book. He is forever dead.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Hi anonimnystefy;

What is wrong?

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,544

well it's still the same problem but this time thanks to my friend i found an infinite lup in one of the procedures.it's named 'kolona':

```
program Sudoku_solver;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Classes
{ you can add units after this };
{$IFDEF WINDOWS}{$R Sudoku.rc}{$ENDIF}
const
max=9;
type
niz=array[1..max] of integer;
matrica=array[1..max] of niz;
var
a:matrica;
i,j,k:integer;
ok:boolean;
function red(a:matrica;i1,j1:integer):boolean;
var
j:integer;
b:boolean;
begin
b:=true;
j:=0;
while (j<=max) and (b=true) do
begin
j:=j+1;
if j<>j1 then
if a[i1][j]=a[i1][j1] then
b:=false;
end;
red:=b;
end;
function vrsta(a:matrica;i1,j1:integer):boolean;
var
i:integer;
b:boolean;
begin
b:=true;
i:=0;
while(i<=max) and(b=true) do
begin
i:=i+1;
if i<>i1 then
if a[i][j1]=a[i1][j1] then
b:=false;
end;
vrsta:=b;
end;
function kvadrat(a:matrica;i1,j1:integer):boolean;
var
i,j,k,l:integer;
b:boolean;
begin
b:=true;
case i1 of
1,2,3: begin
k:=0;
i:=3
end;
4,5,6: begin
k:=3;
i:=6;
end;
7,8,9: begin
k:=6;
i:=9;
end;
end;
case j1 of
1,2,3: begin
l:=0;
j:=3
end;
4,5,6: begin
l:=3;
j:=6;
end;
7,8,9: begin
l:=6;
j:=9;
end;
end;
while (k<=i) do
begin
k:=k+1;
while (l<=j) do
begin
l:=l+1;
if (k<>i1) and (l<>j1) then
if a[k][l]=a[i1][j1] then
b:=false;
end;
end;
kvadrat:=b;
end;
function poz(a:matrica;i,j:integer):boolean;
begin
poz:=red(a,i,j) and vrsta(a,i,j) and kvadrat(a,i,j);
end;
procedure sudoku(var a:matrica;n,i1,j1:integer;var ok:boolean);
var
i,j,k:integer;
b:boolean;
begin
i:=i1;
j:=j1;
a[i][j]:=n;
ok:=false;
if poz(a,i,j) then
begin
ok:=true;
i:=0;
j:=0;
b:=true;
while (b=true) and (i<=max) do
begin
i:=i+1;
while (b=true) and (j<=max) do
begin
j:=j+1;
writeln(i);
writeln(j);
if a[i][j]=0 then
b:=false;
end;
end;
if b=false then
begin
k:=0;
ok:=false;
while (k<=9) and not ok do
begin
k:=k+1;
sudoku(a,k,i,j,ok);
end;
end;
end;
end;
begin
writeln('Enter Sudoku: ');
for i:=1 to 9 do
begin
for j:=1 to 9 do
read(a[i][j]);
readln;
end;
for i:=1 to 9 do
begin
for j:=1 to 9 do
write(a[i][j],' ');
writeln;
end;
k:=0;
ok:=false;
while (k<=9) and not ok do
begin
k:=k+1;
sudoku(a,k,1,1,ok);
end;
if ok then
begin
writeln('Resenje je: ');
for i:=1 to 9 do
begin
for j:=1 to 9 do
write(a[i][j],' ');
writeln;
end;
end
else writeln('Sudoku cannot be solved!!!');
readln;
end.
```

Here lies the reader who will never open this book. He is forever dead.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,247

Hi;

Answer me honestly, did you write this code or did you use what was at the Lazarus site?

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

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