Do you need to have actual cash in pocket to gamble in Las Vegas?

By this question, I mean can you somehow use a credit card to gamble? Say I want to play Roulette, do you buy chips with cash directly from the dealer? The same question goes for Blackjack and Barracat. I believe that the slot machines will take pre-loaded cards. Could someone who frequents Vegas please let me... show more By this question, I mean can you somehow use a credit card to gamble? Say I want to play Roulette, do you buy chips with cash directly from the dealer? The same question goes for Blackjack and Barracat. I believe that the slot machines will take pre-loaded cards. Could someone who frequents Vegas please let me know.

Thanks to all!
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