how to check if two doubles are equal in java

Question

I am writing a program to help students practice division, how can I compare the user Input and the correct answer if they are doubles

score 0 · Accepted Answer · answered Oct 19 '19 at 10:52

You can convert it to BigDecimal, and compare with the required precision of decimal places

BigDecimal aa = new BigDecimal(a);
BigDecimal bb = new BigDecimal(b);
aa = aa.setScale(4, BigDecimal.ROUND_DOWN);
bb = bb.setScale(4, BigDecimal.ROUND_DOWN);
return aa.equals(bb);

score 0 · Answer 2 · answered Oct 19 '19 at 10:59

0

Either use

Double.compare()

or

final double EPSILON = 0.00000001d;
Math.abs(firstDouble - secondDouble) < EPSILON;

it's based on level of accuracy you needed for comparison

answered Oct 19 '19 at 10:59

Sam

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how to check if two doubles are equal in java

2 Answers2