C++ Array get month days

#include <iostream>
using namespace std;
int main()/* w  ww.  j a va 2 s. c om*/
{
   int month, day, total_days;
   int days_per_month[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
   cout << "\nEnter month (1 to 12): ";
   cin >> month;
   cout << "Enter day (1 to 31): ";
   cin >> day;
   total_days = day;                     //separate days
   for(int j=0; j<month-1; j++)          //add days each month
      total_days += days_per_month[j];
   cout << "Total days from start of year is: " << total_days << endl;
   return 0;
}