Lesson 7: DECIMALS & INITIAL ANSWER

[ugur17]

In lesson 7, Patrick explained about decimal and initial answer which are the parameters of constructor in the MockV3Aggregator contract from chainlink. But i really couldn't understand what really is. Can someone exlain with more details? Thanks in advance.

[sarthakkundra]

There's a function called decimals in the actual AggregatorV3 provided by chainlink. @PatrickAlphaC just put the value returned by those functions into a constant because it's required in the contructor for AggregatorV3.

Same for initial answer. We're assuming that our mock contract will return $2000 = 1 ETH i.e. the price of 1 ETH is $2,000. Therefore, we just hardcoded both of those values. Since, Solidity doesn't have decimals we added 8 zeroes after 2,000 that's why the value of INITIAL_ANSWER = 200000000000.

Hope this helps! :)