Rounding Issue

For Example

1. 598.59 ya 591.45 to be convert 600.
2. 541.0 to be convert 550.

3. 541.59 to be convert 550.

   Just check the last 2 digit ignore the decimal value. if last 2 digit in between 11- 19 it will converted 20 if 21-29 then will converted 30 and so on..

So What can i do for this. Need ur Help.

开发者_StackOverflow中文版

thanks in advance....

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I am just guessing what you mean, but assuming you want to round to the nearest n you can do the following.

double d = Math.round(d / n) * n;

e.g. if n = 50

double d = Math.round(d / 50) * 50;

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Use MathUtils [Commons Math] :
- static double round(double x, int scale) or
- static double round(double x, int scale, int roundingMethod)

MathUtils.round(598.59, -1); // 600.0
MathUtils.round(591.45, -1, BigDecimal.ROUND_CEILING); // 600.0
MathUtils.round(541.0, -1, BigDecimal.ROUND_CEILING); // 550.0
MathUtils.round(541.59, -1, BigDecimal.ROUND_CEILING); // 550.0

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For update in question

Just check the last 2 digit ignore the decimal value. if last 2 digit in between 11- 19 it will converted 20 if 21-29 then will converted 30 and so on..

MathUtils.round((double) 111, -1, BigDecimal.ROUND_UP); // 120.0
MathUtils.round((double) 119, -1, BigDecimal.ROUND_UP); // 120.0
MathUtils.round((double) 121, -1, BigDecimal.ROUND_UP); // 130.0
MathUtils.round((double) 129, -1, BigDecimal.ROUND_UP); // 130.0

Cast to double to make sure round(double x, ...) is use, instead of round(float x, ...).

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okay, so you can use the Math class. like this:

Math.floor(myNumber); //541.59 -> 541, returns double

but in this case you have to define your "limit" for rounding. What's the purpose of this?

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for example

public class RoundToTwodecimalPlaces {

    public static double roundTo2Places(double value) {
        assert value >= Long.MIN_VALUE / 100 && value <= Long.MAX_VALUE / 100;
        long digits = (long) (value < 0 ? value * 100 - 0.5 : value * 100 + 0.5);
        return (double) digits / 100;
    }

    private RoundToTwodecimalPlaces() {
    }
}

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598.59 ya 591.45 to be convert 600.
541.0 to be convert 550.
541.59 to be convert 550.

As for me : 1.Divide by 10

59.859
54.10
54.159

2. Round to nearest not less integer and 3. multiply by 10. Received 600 550 550

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public class RoundToTwodecimalPlaces {

public static double roundTo2Places(double value) {
    assert value >= Long.MIN_VALUE / 100 && value <= Long.MAX_VALUE / 100;
    long digits = (long) (value < 0 ? value * 100 - 0.5 : value * 100 + 0.5);
    return (double) digits / 100;
}

private RoundToTwodecimalPlaces() {
}

}