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#include <iostream>
#include <cmath>
using namespace std;
void getInput(int& month, int& day, int& year);
bool isLeapYear(int year);
int getCentury(int year);
int getYear(int year);
int getMonth(int month, int year);
void getOutput(int day, int century, int monthVal, int yearVal);
int main()
{
int century, monthVal, yearVal, day, year, month;
getInput(month, day, year);
isLeapYear(year);
century = getCentury(year);
yearVal = getYear(year);
monthVal= getMonth(month, year);
getOutput(day, century, monthVal, yearVal);
system("PAUSE");
return 0;
}
void getInput(int& month, int& day, int& year)
{
char garbage1, garbage2;
cout << "This Program Determines the Days of Week at a given Date. \n\n";
cout << "To Begin Please Enter the Date in Month, Day, and Year(Only from 1850 ~ 2200):(ex. 7/4/2008)\n";
cin >> month;
cin >> garbage1;
cin >> day;
cin >> garbage2;
cin >> year;
while(month <= 0 || month >= 13)
{
cout << "Invalid Month!!\n";
cout << "Please Enter the Date in Month, Day, and Year (ex. 7/4/2008)\n";
cin >> month;
cin >> garbage1;
cin >> day;
cin >> garbage2;
cin >> year;
}
while(year < 1850 || year > 2200)
{
cout << "Invalid Year!!\n";
cout << "Please Enter the Date in Month, Day, and Year(ex. 7/4/2008)\n";
cin >> month;
cin >> garbage1;
cin >> day;
cin >> garbage2;
cin >> year;
}
while(day < 1 || day > 31)
{
cout << "Invalid Date!!\n";
cout << "Please Enter the Date in Month, Day, and Year(ex. 7/4/2008)\n";
cin >> month;
cin >> garbage1;
cin >> day;
cin >> garbage2;
cin >> year;
}
}
bool isLeapYear(int year)
{
if(year%4 ==0 && year % 100 > 0)
{
return true;
}
else
return false;
}
int getCentury(int year)
{
int year1, total1, total;
year1 = year / 100;
total1 = year1 % 4;
total = 3 - total1;
return (total * 2);
}
int getYear(int year)
{
int year1, year2, total1, total;
year1 = year / 100;
year2 = year - (year1 * 100);
total1 = year2 / 4;
return ( total + year2);
}
int getMonth(int month, int year)
{
int value = 0;
if(isLeapYear(year))
{
switch(month)
{
case 1:
value = 6;
break;
case 2:
value = 2;
break;
}
}
else
{
switch(month)
{
case 1:
value = 0;
break;
case 2:
value = 3;
break;
case 3:
value = 3;
break;
case 4:
value = 6;
break;
case 5:
value = 1;
break;
case 6:
value = 4;
break;
case 7:
value = 6;
break;
case 8:
value = 2;
break;
case 9:
value = 5;
break;
case 10:
value = 0;
break;
case 11:
value = 3;
break;
case 12:
value = 5;
break;
default:
value = 0 ;
}
}
return value;
}
void getOutput(int day, int century, int monthVal, int yearVal)
{
int total1;
string total;
const int CALC_DAYS = 7 ;
total1 = (day + monthVal + yearVal + century ) % CALC_DAYS;
switch(total1)
{
case 0:
total = " Sunday ";
break;
case 1:
total = " Monday ";
break;
case 2:
total = " Tuesday ";
break;
case 3:
total = " Wednesday ";
break;
case 4:
total = " Thursday ";
break;
case 5:
total = " Friday ";
break;
case 6:
total = " Saturday ";
break;
}
cout << "At the Date You have inputed, \n"
<< "The Day of the Week Should be a" << total << ".\n";
}
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