Re: How to avoid rounding problems when working with doubles

Try BigDecimal if you need precision.

/Stefan

Den tisdag 12 januari 2016 kl. 12:28:31 UTC+1 skrev Frank:

Javascript has some serious problems when working with floating numbers.

Like if you enter the following into a javascript in any browser : 7.3 - 7

These will all give the result : 0.2999999999999998

This problems is also visible in GWT : 

int test = 7;

double dTest = 7.3;

double result = dTest - test;

GWT.log("test result = " + result);

will also print out 0.2999999999999998

How does one avoid these problems in GWT, so that you can trust on the results you receive when calculating with floating point numbers ?

FYI : The specific use case that I have is that users enter a time in decimals hours in a textbox. And I must recalculate this to minutes.
For example when the user enters 7.5, this should give 450 minutes.
But with all these rounding problems this often goes of by one minute...

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