java - 我需要帮助打印出程序中出现的最大绝对差异的价格。 (我快完成了。)

Question

我无法找出在 if 条件下更新价格的正确方法。这可能真的很简单，但我遇到了麻烦。这是我的代码。

public class Change {
    public static void main(String[] args) {
        final int days = 10;
        int largeDiff = 0; // largest difference
        int price2 = 0;
        int day1 = 1;
        int day2 = 2;

        Scanner sc = new Scanner(System.in);
        System.out.println("Enter stock prices:");

        int price1 = sc.nextInt();

        for (int i = 2; i <= days; i++) {
            price2 = sc.nextInt();
            int diff1 = Math.abs(price1 - price2);
            price1 = price2;

            if (diff1 > largeDiff) {
                largeDiff = diff1;
                day2 = i;
                day1 = day2 - 1;
            }
        }

        System.out.println("Largest change of " + largeDiff);
        System.out.println("from " + price1 + " to " + price2);
        System.out.println("happened between day " + day1 + " and day " + day2);
    }
}

Answer 1

你的问题是线路

System.out.println("from " + price1 + " to " + price2);

因为在循环结束时，price1 和 price2 都将是最后输入的价格。

您需要做的是，当您存储 largeDiff、day1 和 day2 的值时，您还应该存储这两个价格的值。然后在循环结束时，打印这些存储的值，而不是 price1 和 price2。

price2 = sc.nextInt();
    int diff1 = Math.abs(price1 - price2);
    if (diff1 > largeDiff) {
        largeDiff = diff1;
        day2 = i;
        day1 = day2 - 1;
        storedPrice1 = price1;
        storedPrice2 = price2;
    }
    price1 = price2;

 }

 System.out.println("Largest change of " + largeDiff);
 System.out.println("from " + storedPrice1 + " to " + storedPrice2);