I know that there are issues arising from using primitives of data type double in mathematical expressions. Somewhere in the earlier polsts it was suggested to use Math.round(a), where a is a double. However, when I execute the following: ... double x = 27.475; double y = 7.22; double z = x - y; System.out.println("x - y = " + Math.round(z)); ... I get "x - y = 20", not 20.255. If I do not use Math.round, I get 20.255000000000003. Now, how would one do the basic calculations then and get the correct result?
Manfred Leonhardt
Ranch Hand
Joined: Jan 09, 2001
Posts: 1492
posted
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Hi Sergey, You are getting the correct result. Math.round only returns an integer. If you want to "print" out the answer formatted then you can make use of java.text.SimpleDecimalFormat. SimpleDecimalFormat sdf = new SimpleDecimalFormat( "#.000" ); System.out.println( "x - y = " + sdf.format( z ) ); Regards, Manfred.
Sergey Gorovoy
Greenhorn
Joined: Jul 28, 2001
Posts: 3
posted
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Thanx! But what about the situation when the value of X and Y is being assigned dynamically, which may result in more than 3 decimal positions for Z? Is there any way to dynalically "round" the result?
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