// p03_06.cpp: Read month, day, year (for example, 12 31 1999)

// and compute the day number (within one year) of this date.

#include <iostream>

using namespace std;



int main() {



int day, month, year, i, dayNumber=0;

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

cout << "Enter month, day, and year, such as 12 31 1999:\n";

cin >> month >> day >> year;

if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)

 ++cal[2]; // changes one element of an array by one;

for (i = 1; i<=12; i++)

 if (i < month) dayNumber += cal[i]; else break;

dayNumber += day;

cout << "Day number counted frm January 1st, is " << dayNumber << endl;

return 0;

}