Printf problem!!!

[pinar]

Hi.İ want to format with print f for double cost=1.37*10
it is output 1.3700001 ı want to 1.37 show help me pls

[Fubarable]

Please show us how you're trying to use printf.

Here's an example of using printf to specify precision of displayed double/float value: SpecifyingtheWidthandPrecision

[Johanis]

Hi.İ want to format with print f for double cost=1.37*10
it is output 1.3700001 ı want to 1.37 show help me pls

Hi I had the exact problem and I used this code to fix the problem:

 double resS0 = resS%1;//resS is the number you want rounded
         double resS1 = resS0 * 100;
         double resS2 = Math.round(resS1);
         double resS3 = resS2 / 100;

good luck!

[Fubarable]

Hi I had the exact problem and I used this code to fix the problem:

 double resS0 = resS%1;//resS is the number you want rounded
         double resS1 = resS0 * 100;
         double resS2 = Math.round(resS1);
         double resS3 = resS2 / 100;

good luck!

I'm going to disagree here as rounding is not going to solve what is essentially a display problem. e.g.,

      double foo = 1.37 * 3.5 * 3 * 2;
      foo /= (21);
      System.out.println("cost = " + foo);
      System.out.printf("cost = %.2f%n", foo);

Of course there is more than one way to skin this cat, and if in fact cost represents a display of currency, then why not use a NumberFormat.getCurrencyInstance?

   public static void main(String[] args) {
      double cost = 1.37 * 3.5 * 3 * 2;
      cost /= (21);
      System.out.println("cost = " + cost);
      System.out.printf("cost = %.2f%n", cost);
      
      NumberFormat currencyFormat = NumberFormat.getCurrencyInstance();
      System.out.printf("cost = %s%n", currencyFormat.format(cost));
   }