# EL "" will it be interpreted as zero ?

Kathiresan Chinna
Ranch Hand
Posts: 115
Hi there,

See the following EL and return values

1. \${ "" > -1 } --> true
2. \${ "" > 0 } --> false
3. \${ "" == 0 } --> false
4. \${ "" < 1 } --> true

As per the JSp spec Coerce A to Number type N
• If A is null or "", return 0.

But the 3 is evaluated false.
Is this correct ?

Kathiresan

Milton Ochoa
Ranch Hand
Posts: 336

but i wonder, why you got there, i mean, compare the "" sttring with number.

Maybe the comparation is about strings and not numbers.

Kathiresan Chinna
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Posts: 115
I have to test this for exam purpose.

Milton Ochoa
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Posts: 336
I am preparing for the exam too.

are you taking a simulator? mock exam?

Kathiresan Chinna
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Posts: 115
Hi, I am reading HFSJ book and practise from that question.

Milton Ochoa
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Posts: 336
on enthuware says on one answer.

...Since none is "", it will be interpreted as 0...

and none is declarated like String none = "";

but they mention (JSP 2.3.5.1) too. But there say nothing about that.

Abdul Rahman
Ranch Hand
Posts: 63
As per HFSJ 1st edition and as per JSP2.0 spec, for arithmetic operation, EL treats the null values as Zero.
For logical operation, EL treats null values as false.

Abdul Rahman
Ranch Hand
Posts: 63
As per HFSJ 1st edition and as per JSP2.0 spec, for arithmetic operation, EL treats the null values as Zero.
For logical operation, EL treats null values as false.
3. \${ "" == 0 } --> false

This will return true.

Kathiresan Chinna
Ranch Hand
Posts: 115
Hello,

I am using Tomcat 6.0.18
I got \${ "" == 0 } --> false

Kathir

Abdul Rahman
Ranch Hand
Posts: 63
Hi Kathy,
As per JSP2.0 spec and as per Tomcat5.0 (the one i'm using), i got that result to be true.
We'll have to look the jsp version supported by tomcat6. and the spec of that jsp version.