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Making precisions in calculations with JSTL

 
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Hi guys! I'm having rounding off issues. Are there any equivalent of the Math class methods ceil, round and floor? It seems that fmt:number only outputs to a String. What if I still have to use it in my calculations? Last time I tried, fmt:number doesn't even accept an expressions ${} as a value! Any ideas guys?

Here is my code. The variables factor and percentage needs to be rounded off to the nearest integer during calculation.

 
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