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为什么Chainlink的喂价PriceFeed返回的价格数据类型是int类型呢？

 3 years ago
source link: https://learnblockchain.cn/question/1979
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为什么Chainlink的喂价PriceFeed返回的价格数据类型是int类型呢？ | 登链社区 | 技术问答

为什么Chainlink的喂价PriceFeed返回的价格数据类型是int类型呢？ 

pragma solidity ^0.6.7;

import "@chainlink/contracts/src/v0.6/interfaces/AggregatorV3Interface.sol";

contract PriceConsumerV3 {

    AggregatorV3Interface internal priceFeed;

    /**
     * Network: Kovan
     * Aggregator: ETH/USD
     * Address: 0x9326BFA02ADD2366b30bacB125260Af641031331
     */
    constructor() public {
        priceFeed = AggregatorV3Interface(0x9326BFA02ADD2366b30bacB125260Af641031331);
    }

    /**
     * Returns the latest price
     */
    function getThePrice() public view returns (int) {
        (
            uint80 roundID, 
            int price,
            uint startedAt,
            uint timeStamp,
            uint80 answeredInRound
        ) = priceFeed.latestRoundData();
        return price;
    }
}

代码中，price的类型是int类型，为什么用的是包含负数的类型来表示价格数据呢？


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