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javamathnumbersrounding
Hiran
Hiran

Reputation: 287

Java - rounding by quarter intervals

I'm running into following issue...

Does an already 'built-in' function exists in java to round given random numbers to the closest lower quarter value.

These are the given random numbers:

2.00 -> 2.00
2.24 -> 2.00
2.25 -> 2.25
2.49 -> 2.25
2.50 -> 2.50
2.74 -> 2.50
2.75 -> 2.75
2.99 -> 2.75
3.00 -> 3.00

Upvotes: 1

Views: 1476

Answers (3)

Stan Fad
Stan Fad

Reputation: 1234

Try this:

double value = 2.99D;
value = (double)(int)(value * 4) / 4;

Upvotes: 0

toskv
toskv

Reputation: 31612

You can multiply the value by 4 then floor it then divide by 4.

public static double quarterRound(double v){
   return Math.floor(v*4)/4;
}

Upvotes: 7

Davide Lorenzo MARINO
Davide Lorenzo MARINO

Reputation: 26926

You need to round to quarters so:

  • Multiply by 4
  • Floor to next int
  • Divide by 4

Note that if you reliable values it is better to works with BigDecimal instead of primitive values (double or float). The algorithm stay the same.

Upvotes: 3

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