根据输入的日期，计算是这一年的第几天

￡神魔★判官ぃ 2023-06-08 06:24 80阅读 0赞

**根据输入的日期，计算是这一年的第几天**

**分析:**

> 思路比较简单, 从这一年的开始一直加到这一天, 注意闰年二月是29天

[OJ链接][OJ]

#include<iostream>
    using namespace std;
    class Solution {
    public:
    int fun(int year, int month, int day) {
        int Month1[12] = { 31,29,31,30,31,30,31,31,30,31,30,31 };
        int Month2[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
        int count = 0;
        if (year % 400 == 0 || year % 4 == 0 && year % 100 != 0) {
        	if (year < 0 || month < 1 || day < 1 || month>12 || day<1 || day>Month1[month - 1]) { 
        		return -1;
        	}
        	for (int i = 0; i < month - 1; ++i) {//循环相加该天所在月份之前的所有月份天数之和
        		count += Month1[i];
        	}
        }
        else {
        	if (year < 0 || month < 1 || day < 1 || month>12 || day<1 || day>Month2[month - 1]) { 
        		return -1;
        	}
        	for (int i = 0; i < month - 1; ++i) {//循环相加该天所在月份之前的所有月份天数之和
        		count += Month2[i];
        	}
        }
        count += day;//加上还不到整一月的天数
        return count;
        }
    };
    int main() {
        int year, month, day;
        Solution p;
        while (cin >> year >> month >> day) {
    	    cout << p.fun(year, month, day) << endl;
        }
        system("pause");
        return 0;
    }

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[OJ]: https://www.nowcoder.com/practice/769d45d455fe40b385ba32f97e7bcded?tpId=37&&tqId=21296&rp=1&ru=/activity/oj&qru=/ta/huawei/question-ranking
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