Comparing large numbers returns false

[tosfera]

I've got some proper brainf*cking material right here. I'm comparing someone's money ( both int values ) and the debugs are outputting the same values. By using tonumber the results end up being false. If I change them to a string, it works. The debugs below are the results including their type;

number type;

check: false 
value1: 695.41000000001 [type] number 
value2: 695.41000000001 [type] number 

string type;

check: true 
value1: 695.41000000001 [type] string 
value2: 695.41000000001 [type] string 

The check goes as following;

if ( tonumber ( elementMoney ) == tonumber ( itemMoney ) ) then -- returns false 
if ( tostring ( elementMoney ) == tostring ( itemMoney ) ) then -- returns true 

Why in seven hells is the check going wrong if I'm parsing them to a number but works if I parse them to a string?

[Captain Cody]

There's an issue in general with lua that expands the number, messing with the final results.

[tosfera]

There's an issue in general with lua that expands the number, messing with the final results.

So comparing numbers is just a no go in lua? Strings all the way?

[IIYAMA]

You sure they are integer values? Because they look more like floats to me.

if elementMoney == itemMoney then 

And what is this result? Maybe the tonumber has something to with it.

if tonumber(tostring(elementMoney)) == tonumber(tostring(itemMoney)) then 

And this?

[tosfera]

if elementMoney == itemMoney then 

this returns false, which is also weird. They are both integers.

I do have to test this one when I get home, will get back to you once I have it.

if tonumber(tostring(elementMoney)) == tonumber(tostring(itemMoney)) then 

[Captain Cody]

Converting it to string, then back to to number may work as IIYAMA stated, as the tostring will cut out any of the random numbers that lua is throwing in on it.

[IIYAMA]

Problem solved?

[tosfera]

Problem solved?

compared them as strings, that did solve it. No need to create it as numbers since there is no way the money could be transformed with chars in it, too much protection for that on different locations.