Decimal format in JAVA !!!!!!!!

joePC

I have 3 input dialogs taking 3 values that are then mulitpyed, is there any way of setting it so that only 2 decimal places are shown,

e.g. 3.22 instead of

3.22222222222222222222222222

I'll post the code if you want but its a bit long, if you could give me some code examples that would be great.

Thanks loads in advance..

Thanks joePC...

joePC

I've found all the articals on the java site but it still doesnt make much sence to me, "Im new @ the java"

Thanks joePC

Kevok

Dirty method, sure theres probably a better way but;

Multiply the answer by 100. Cast it into an integer to drop all the sub decimal places, then divide by 100 casting into a double or float. Then return the double/float.

[Edit]You're new at Java sorry:

int temp = (int)answer*100; // (int) casts the number into an integer dropping everything below the .
return ((double)temp/100);// (double) does the same for decimal

[/Edit]

joePC

Thanks for that Kevok that works perfectly..

Thanks joePC

davej

Funnily enough there is a class called..ahem DecimalFormat that you can use.

java.text.DecimalFormat df=new DecimalFormat("0.00");
float f = 10.2334343556;
System.out.println(df.format(f));

davej

Civilian_Target

Does that save the result back into float f or do you have to use it in the form

float newvar = df.format(f);

?

davej

it returns a string...
(edited my previous post before i saw your question)

davej

Karoma

if it's just for the returned result, return as a String and format

hussey

and to revert a string back to a float :

/* assume var num is a float, and word is the string value*/
try {

      num = java.lang.Float.parseFloat(word);

}catch (NumberFormatException nfe) {
      system.out.println("Number format exception : make sure \"" + word + "\" is valid");
}