How to Change Decimal Point for Price Format

Sometime you need to play with the price format. magento default add 2 precision format for the price. now if you want to remove precision or want to keep 3 decimal point for price then you need to do following

1) Open /lib/zend/Currency.php file

2) Find 'precision' => 2 near line no. 78

here is the place, you need to change precision decimal

Change 'precision' => 0 if you want to keep 0 decimal