struct_12

#include <iostream> //exercise 12
#include <string> //there is a date in dd.mm.yyyy format. What day of the week corresponds to this date?
//01.01.1973 - monday
//0 - monday, 1 - tuesday, ..., 6 - sunday
using namespace std;

int curDay, curMonth, curYear;

void stringToDate(string s)
{
    curDay = stoi(s.substr(0, 2));
    curMonth = stoi(s.substr(3, 5));
    curYear = stoi(s.substr(6));
}


bool bisSextus(int n)
{
    if (n % 4 == 0 && n % 100 != 0 || n % 400 == 0)
        return 1;
    else
        return 0;
}


int main()
{
    int daysInMonth[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    string s;
    cout << "Enter the date\n";
    cin >> s;

    int dayNULL = 1;
    int monthNULL = 1;
    int yearNULL = 1973;

    stringToDate(s);
    int counter = 0;
    for(int i = yearNULL; i < curYear; i++)
    {
        if (bisSextus(i))
            counter += 366;
        else
            counter += 365;
    }

    for(int i = monthNULL; i < curMonth; i++)
    {
        counter += daysInMonth[i - 1];
    }
    if (curMonth > 2 && bisSextus(curYear))
        counter++;

    counter += (curDay - dayNULL);

    counter %= 7;

    switch (counter)
    {
    case 0:{cout << "MONDAY\n"; break;}
    case 1:{cout << "TUESDAY\n"; break;}
    case 2:{cout << "WEDNESDAY\n"; break;}
    case 3:{cout << "THURSDAY\n"; break;}
    case 4:{cout << "FRIDAY\n"; break;}
    case 5:{cout << "SATURDAY\n"; break;}
    case 6:{cout << "SUNDAY\n"; break;}
    }

    system("pause");
    return 0;
}