What does %5.2f do in c program?

Answer 1

just a precision on what Mythos has said. %v.df formats a float number to 'n' total digits and 'd' decimals... 'f' means float, if there was %d at the place, this would mean you're printing an int value.
P.S.: my English is awful...

Answer 2

Formats a number to 5 total digits and two decimals