can i print from iphone to cannon mx340

Unfortunately, the Canon MX340 is not on the list of AirPrint compatible devices.....see the Apple support document in the link just below for a list of compatible printers......so you will not be able to print directly from the iPhone.

http://support.apple.com/kb/HT4356

You might still be able to print from the iPhone if you install an App like Printopia on your Mac. There is a free trial, so you will know whether it will function as a workaround in a few minutes.

Printopia - AirPrint to Any Printer - Print from iPad - Print from iPhone ...