Math.round() 的结果被忽略

Question

Why is it not working?I want to "odleglosc" is 2.2 not 2.214354356

Answer 1

Math.round(argument) returns a number that is rounded from the argument.

In your example you ignore the returned value.

You probably meant to write:

 odleglosc = Math.round(odleglosc);

Answer 2

x = Math.round(x);

Otherwise if you just write Math.round(x); Java will make the calculation and have no variable to assign it to, and gets thrown away.

Answer 3

Math.round() does not modify your variable because a double the value is passed to the function (compare all-by-value vs call-by-reference).

To round your value use

a = Math.round(a);