Question

There are already so many questions asked about this already.

One popular answer is to use the below formula.

  Math.ceiling(myValue * 20) / 20

I need the following output for corresponding input.

     16.489 (input)   - 16.49(output)

Using the above formula

     16.489*20  = 329.78

     Math.ceil(329.78) = 330.0

     and 330.0 /20  = 16.5 

but what I want is 16.49.

Ideally the Math.ceil stuff should have given 329.8

So how do we get around the above case? There are many other cases similar to this.

Answer 1

Instead of multiplying / dividing with 2*10, you should do it with 10².

However, I suggest you use Math.round(100*a) / 100.0, or if you need it for printing, printf or DecimalFormat.

Examples:

double input = 16.489;

// Math.round
System.out.println(Math.round(100 * input) / 100.0);

// Decimal format
System.out.println(new DecimalFormat("#.##").format(input));

// printf
System.out.printf("%.2f", input);

Output:

16.49
16.49
16.49