Question

I am getting wrong result using below method.

public double evaluate(final double leftOperand, final double rightOperand) {
        Double rtnValue = new Double(leftOperand * rightOperand);
        return rtnValue.doubleValue();
    }

Enter Parameter value are: leftOperand= 100 and rightOperand=2.55

I am getting Wrong answer: 254.99999999999997

The correct answer is a 255.0

Answer 1

Use BigDecimal

BigDecimal bd = new BigDecimal("100");
BigDecimal ans = bd.multiple(new BigDecimal("2.55"));
System.out.println(ans);

See Also

• Working IDE One demo

• Retain precision with double in Java