Can a ethereum smart contract look up the current dollar/ether exchange rate and then change its behaviour depending on it?? and how? [duplicate]

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can a contract on blockchain get outside data like "current dollar/ether exchange rate" using api like call??
If yes, how can it be done? and is there any technique to control the behaviour of the contract depending on outside factors like fluctuations in ether/ dollar currency?

eth♦

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asked Jul 25 '16 at 12:28

siddesh sangodkar

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marked as duplicate by eth♦ Jul 25 '16 at 12:53

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