formatting...

[lionheart]

im kinda a noob at java but is it possible to format without outputting?
for example...
String mortStr = Double.toString (mortgage);
if a large number was inputted and calculations occured the string would have alot of decimals..
so im wondering if there is a way to format or
change it so that i around 2 decimal places?
Math.round works... but it would be easier for me if i could have 2 decimal places

[Hikaru79]

This is a neat trick. You want it to two decimal places? While it's still a double, multiply it by 100, round it, and divide it by 100. For example:

Your number is 64.56945
Multiply by 100 = 6456.945
Round to nearest whole number = 6457
Divide by 100 = 64.57
And voila! 64.57 is what you would normally have gotten from rounding to two. In java, this looks like

Java:

myDouble = 64.56945; myDouble = (double) (Math.round (myDouble*100))/100;

That should work =) Remember, comp sci is all about creative problem solving ^_^

[lionheart]

see the thing is .... if it was a number lik 23232.23232323223
the decimals are a result of a division or multiplication of a decimal,
so then even if you multiply by 100 or divide...
then it will still have 2323223.232323
so i want to "get rid" of the extra decimals


actaully wait..

[lionheart]

that did work... thanks a million hikaru
i ve spent so long on this damn final project....

[Hikaru79]

No problem, Lionheart =) Pass it on!

[lionheart]

what if its .... .say...
1234567.0
multiply..... its
123456700
divide it still is 1234567.0
the reason it so impotant, is beause im trying to create a chart...

[Neo]

lionheart wrote:

what if its .... .say...
1234567.0
multiply..... its
123456700
divide it still is 1234567.0
the reason it so impotant, is beause im trying to create a chart...

You said you needed your numbers rounded to two decimal places, and since that number is already rounded, couldn't you just add another zero to the end of that number?

[lionheart]

but if the number was something like...
1234567.192
and you added ... .12345670.192
then when you multitply round and divide..
you would get rid of the las number and aadd a uneeded 0

[wtd]

A better solution would be to use a DecimalFormat object.

First you need to import java.text.

code:

import java.text.*;

Then you create a DecimalFormat object.

code:

DecimalFormat f = new DecimalFormat("$#0.00"); System.out.println(form.format(42.2734));

The reference page.