CODEWITHSUNDEEP
java
Arvind Kumar Avinash
Arvind Kumar Avinash

Reputation: 79425

How to display 0.05 as 0.0, 0.05 and 0.050

How to display 0.05 as 0.0, 0.05 and 0.050?

My code

double x = 0.05;
System.out.printf("%.1f%n", x);
System.out.printf("%.2f%n", x);
System.out.printf("%.3f%n", x);

prints

0.1
0.05
0.050

I want the first result as 0.0.

Louis Wasserman has suggested doing it using BigDecimal but I do not know how to use BigDecimal to do it.

Upvotes: 1

Views: 168

Answers (2)

Mykhailo Skliar
Mykhailo Skliar

Reputation: 1367

Try the following examples:

   double  roundedTotal = new  BigDecimal(0.05).setScale(1, RoundingMode.FLOOR).doubleValue();
   roundedTotal ==> 0.0

   roundedTotal = new  BigDecimal(0.09).setScale(1, RoundingMode.FLOOR).doubleValue();
   roundedTotal ==> 0.0

   roundedTotal = new  BigDecimal(0.59).setScale(1, RoundingMode.FLOOR).doubleValue();
   roundedTotal ==> 0.5

   roundedTotal = new  BigDecimal(0.599).setScale(2, RoundingMode.FLOOR).doubleValue();
   roundedTotal ==> 0.59

So in your case it should be like this:

double x = 0.05;
System.out.printf("%.1f%n", new  BigDecimal(x).setScale(1, RoundingMode.FLOOR).doubleValue());
System.out.printf("%.2f%n", new  BigDecimal(x).setScale(2, RoundingMode.FLOOR).doubleValue());
System.out.printf("%.3f%n", new  BigDecimal(x).setScale(3, RoundingMode.FLOOR).doubleValue());

Upvotes: 2

Randy Casburn
Randy Casburn

Reputation: 14175

Alternatively to BigDecimal, you can also use DecimalFormat which might be more appropriate for you purposes:

        double number = 0.050;
        DecimalFormat df1 = new DecimalFormat("#.#");
        DecimalFormat df2 = new DecimalFormat("#.##");
        DecimalFormat df3 = new DecimalFormat("#.###");
        df1.setRoundingMode(RoundingMode.FLOOR);
        df1.setMinimumFractionDigits(1);
        df2.setMinimumFractionDigits(2);
        df3.setMinimumFractionDigits(3);
        System.out.println(df1.format(number));
        System.out.println(df2.format(number));
        System.out.println(df3.format(number));

Working Example

Upvotes: 3

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