模板——判斷一個8位數是不是日期

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<iostream>

using namespace std;

int months[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

//判斷是不是日期
bool check(int date)
{
    int year = date / 10000;
    int month =  date % 10000 / 100;
    int day = date % 100;
    
    if(!month || month > 13 || !day) return false;
    if(month != 2 && day > months[month]) return false;
    if(month == 2)
    {
        bool leap = year % 4 == 0 && year % 100 || year %400 == 0;
        if(day > months[2] + leap) return false;
    }
    return true;
    
}