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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,485

Hi;

Do you know how to use them?

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

yes,but it takes so long!

anyway i noticed that the program acts weirdly around ones.

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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: 90,485

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.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

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: 90,485

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.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

**Online**

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

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: 90,485

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.

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

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: 90,485

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?

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

input routine?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,485

Yes, the one that accepts your sudoku problem.

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

it looks good.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,485

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

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

did it.it loaded.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,485

Which variables represent your row and columns?

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

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: 90,485

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

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

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: 90,485

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

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

oh that's what you meant!

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,485

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

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

help me!

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,485

Hi anonimnystefy;

What is wrong?

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

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: 90,485

Hi;

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

**In mathematics, you don't understand things. You just get used to them.**

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