//programer: Daniel Melvin
//Date:2/12/2012
//Comp 130
//Assignment 2
//Purpose: given date, calculates day of the week

#include <iostream>
#include <iomanip>
using namespace std;


int main()
{
    //input data
    int yearIn = 0;
    int monthIn = 0;
    int dayIn = 0;
   //calculation data
    int year =0;
    int century =0;
    int dayWeek = 0;
    int month = 0;
    string day= "";

    cout<<"Enter year, eg. 2012  ";
    cin>> yearIn ;
    cout<<"Enter month, 1-12:  ";
    cin>>monthIn;

    if(monthIn>=0 && monthIn<=12)
    {
    }
    else
    {   cout<<"wrong month input ";
          return 0;
    }

    cout<<"Enter day of month, 1-31:  ";
    cin>> dayIn;

    if(monthIn >=0 && monthIn<=2)
         {month= monthIn+12;
            yearIn= yearIn-1;
         }

    year= yearIn%100;  //last 2 digits of year
    century= (yearIn/100); //first 2 digits of year


    dayWeek = (dayIn+(((26*month+26)/10)+year+(year/4)+(century/4)- 2*century) %7);
    //dayweek is 0-6, this is then translated into day of the week.

    if(dayWeek==0)
    {   day= "Saturday";
    }
    if(dayWeek==1)
    {   day= "Sunday";
    }
    if(dayWeek==2)
    {   day= "Monday";
    }
    if(dayWeek==3)
    {   day= "Tuesday";
    }
    if(dayWeek==4)
    {   day= "Wednesday";
    }
    if(dayWeek==5)
    {   day= "Thursday";
    }
    if(dayWeek==6)
    {   day= "Friday";
    }

    cout<<"The day of the week is  "<<day<<dayWeek<< endl;

   return 0;
}