it depends on the card and how they charge interest on your purchases

MOST not all cards give you a 30 day grace period before they start charging interest. on these cards the STATEMENT balance paid in full will work.
on cars with a shorter grace period pay the FULL balance.

or you can do what i do and pay the balance in full EVERY WEEK. i just log into my CC account and pay the balance.
i like doing it this way because it's easier to keep a eye on my purchases and it's easier and faster to dispute any charges i have been billed for that i didn't make. some cards have a pretty small window to do this.

the most important thing is READ THE TERMS of you CC. it is in every bill you get from the CC co. every card is different so if you don't read this and understand them don't use the card.