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#1
February 3rd, 2011, 04:41 PM
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Pascal - EXITCOde 215 w bgger numbers while searching for LCM

Hello,
I have a problem w buffer overflowing
I have to (logn story short (there is a huge story line behind this problem in instructions w timetravelign etc. ...)) find the least common multiplier but when I insert bigger numbers it will exit w exitcode 215 (whcih I read its an overflow issue)

Code:
```program VyrocnyPles;
var I,PocetUloh,PocetProm,PrvyClen,DruhyClen,Clen1,Clen2,Vysledok,J:Longint;
begin
while PocetUloh<>0 do
begin
for I:=2 to PocetProm do
begin
if I=2 then
begin
Clen1:=PrvyClen;
Clen2:=DruhyClen;
repeat
if PrvyClen>DruhyClen then PrvyClen:=PrvyClen - DruhyClen;
if PrvyClen<DruhyClen then DruhyClen:= DruhyClen - PrvyClen;
until PrvyClen=DruhyClen;

Vysledok:= Clen1 * (Clen2 div PrvyClen);
end;

If I>2 then
begin
Clen1:=Vysledok;
Clen2:=PrvyClen;
repeat
if PrvyClen>Vysledok then PrvyClen:=PrvyClen - Vysledok;
if PrvyClen<Vysledok then Vysledok:= Vysledok - PrvyClen;
until PrvyClen=Vysledok;

Vysledok:= Clen1 * (Clen2 div PrvyClen);
end;
end;
writeln(Vysledok);

PocetUloh:=PocetUloh - 1;
end;

end.```

I jsut realized that I was giving a slvoak names to my variables so that may be a problem for u guys
Vysledok= Solution
Clen= Unit
PocetUloh (no. of assigments)

Well, on input I am given
in first row a no of assigments 1<n<10k
2nd row is number of people (numebrs that I will have to find the LCM)1<s<50k
3rd row are the numbers 1<r<10k
4th row is the same as 2nd one and so on

I am using an Euclyd alghorhytm to find the greatest common dividor and I divide 2nd unit with it and then I multiply it with the first unit and it will find me the least common multiplier for 2 numbers, then I will remember the soultion of that and then Solution= Unit 1 and I repeat the process

All works fien w small numbers, w I addd bigger numebrs it fails

Any advise? How can I overcome this without learning a new language?
Thnx guys

#2
February 3rd, 2011, 05:33 PM
 OmegaZero
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Can you give some specific examples of inputs that fail?
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sub{*{\$::{\$_}}{CODE}==\$_[0]&& print for(%:: )}->(\&Meh);

#3
February 3rd, 2011, 06:11 PM
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2
5
123 234 345 456 567
Exitcode

#4
February 3rd, 2011, 07:39 PM
 OmegaZero
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Yep, it looks like that result will exceed the size of a 32-bit Longint. You can check if your Pascal compiler supports a 64-bit data type. Otherwise you will need to find a big-number library.

#5
February 4th, 2011, 02:51 AM
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Yea
but the funny thing is that libraries are forbidden from the university And yea, I thought the same that some numbers will be just too high for long int

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