Bug in comparison

Hi all

There is a good one, which may have an obvious answer (and that's the reason why I first decided to ask here before filing a bug).

< cfset t1 = ToString("00237000000075384887") >

< cfset t2 = ToString("00237000000075384892") >

< cfif t1 t2 EQ > < equal cfoutput > #t1 # #t2 # < / cfoutput > < cfelse > < different cfoutput of #t2 # #t1 # > < / cfoutput > < / cfif >

The result of the above is rather surprising. Just this kind of comparison think the numbers are equal. In addition, even if the two numbers are converted to strings, ColdFusion still think they are equal.

If you use Compare(t1,t2) However, ColdFusion starts by comparing the chains that we humans and distinguish between them

Now if there is no known limitation to compare the long numbers etc. or the fact that the middle of each of them is filled with zeros affects everything, welcome to point out for me.

Simon

Do a google on "floating point precision.

As CF is weakly typed, it must make some assumptions when it comes to what type operations is significant. The EQ operator is an example of this: If the CF can climb the operands of numeric values, it will be, which is what he does here. And when it converts strings into numeric values, both are 2.37000000075E + 017, so they equal.

If you want to compare two strings explicitly as chains, then you must use compare(), as you might have already guessed.

There are no surprises in everything you see.

--

Adam

Tags: ColdFusion

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