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Float Rounding Solution

 
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how can I get the following to round to two decimal places?

 
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Either a NumberFormatter or like this

 
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BigDecimal has some rounding methods if you need to keep the result as a number.

In fact, float and double are never a good idea if you need precision. The following shows how bad it can get:
And float is just as bad.
 
Consider Paul's rocket mass heater.
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