Java decimalFormat RoundingMode

Question

I need to archive this: (basically num1 * num2 = num3 and num1 and num2 are given)

1) 10.62 * 4.0 = 42.48 
2) 14.89 * 8.5 = 126.56 
3) 13.21 * 6.0 = 79.26 
4) 16.55 * 7.35 = 121.64 
5) 18.62 * 9.0 = 167.58 
6) 9.47 * 15.3 = 144.89
7) 6.58 * 3.0 = 19.74 
8) 18.32 * 5.4 = 98.93 
9) 12.15 * 2.9 = 35.24 
10) 3.98 * 4.8 = 19.10

This exercise is to practice formatting/rounding string/number.

So I used:

DecimalFormat decimalFormat = new DecimalFormat(".00");
System.out.println(decimalFormat.format(num3));

and got everything right but the 9) 12.15 * 2.9 = 35.24 , I got 35.23 instead of 35.24 The default RoundingMode of DecimalFormat is HALF_EVEN, if I use RoundingMode.UP I will get this right 35.24 but the others results will be messed so I am stuck...

What should I use in order to get the expected result?

Answer 1

Using RoundingMode UNNECESSARY , will solve your problem. Additionally you can catch exceptions and specify output manually if needed.