1. 题目

读题

HJ73 计算日期到天数转换

考查点

2. 解法

思路

 需要先了解闰年以及日历相关的知识 

HJ73 计算日期到天数转换 前置知识 关于日历

代码逻辑

具体实现

public class HJ073 {

    public static int[] dayNum = {1, -2, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1};

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int year = sc.nextInt();
        int month = sc.nextInt();
        int day = sc.nextInt();
        System.out.println(getDaySeq(year, month, day));
    }

    public static int getDaySeq(int year, int month, int day) {
        int offset = 0;
        for (int i = 0; i < month - 1; i++) {
            offset += dayNum[i];
        }

        int seq = 30 * (month - 1) + offset + day;

        if (month > 2 && (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)) {
            seq++;
        }
        return seq;
    }

}

3. 总结