# Thread: Printf problem!!!

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## Printf problem!!!

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

2. 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
Last edited by Fubarable; 11-06-2010 at 10:00 PM.

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Originally Posted by 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
Hi I had the exact problem and I used this code to fix the problem:
Java Code:
``` 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!

4. Originally Posted by Johanis
Hi I had the exact problem and I used this code to fix the problem:
Java Code:
``` 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.,

Java Code:
```      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?

Java Code:
```   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));
}```
Last edited by Fubarable; 11-06-2010 at 10:59 PM.

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