pragma solidity ^0.5.16;

import "./CToken.sol";  

contract PriceOracle {

/// @notice Indicator that this is a PriceOracle contract (for inspection)
bool public constant isPriceOracle = true;

/**
* @notice Update the price of an underlying asset
* @param cToken The cToken to update the underlying price of
*/

function updatePrice(CToken cToken) external;

/**
* @notice Get the underlying price of a cToken asset
* @param cToken The cToken to get the underlying price of
* @return The underlying asset price mantissa (scaled by 1e18).
* Zero means the price is unavailable.
*/

function getUnderlyingPrice(CToken cToken) external view returns (uint);

}