printmonth

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

void printMonthTitle(int year, int month); //prints the title based on what is input
void printMonthName(int month);
void printMonthBody(int year, int month);
void printMonth(int year, int month);
int getStartDay(int year, int month); // gets the first day of month
int getTotalDays(int year, int month);
int getDaysInMonth(int year, int month);// gets the total days in month
bool isLeapYear(int year);

int main()
{

int month;
int year;

cout << "Enter the year (e.g. 2001) ";
cin >> year;

cout << "Enter the month of that year (1 - 12) ";
cin >> month;

printMonth(year,month);

return 0;
}

void printMonth(int year, int month)
{
printMonthTitle(year,month);

printMonthBody(year,month);

}

void printMonthTitle(int year, int month)
{
  printMonthName(month);
  cout <<"    "<<year;
  cout << "\n ------------------------------------"<< endl;
  cout<< " Sun  Mon  Tue   Wed   Thu   Fri   Sat "<< endl;
}


void printMonthName(int month)
{
  switch(month)
  {
case 1: cout << " January "; break;
case 2: cout << " February "; break;
case 3: cout << " March "; break;
case 4: cout << " April "; break;
case 5: cout << " May "; break;
case 6: cout << " June "; break;
case 7: cout << " July "; break;
case 8: cout << " August "; break;
case 9: cout << " September "; break;
case 10: cout << " October "; break;
case 11: cout << " November "; break;
case 12: cout << " December "; break;
default: cout << "invalid"; break;
  }
}

void printMonthBody(int year, int month)
{
int StartDay = getStartDay(year, month);
int DaysInMonth = getDaysInMonth(year, month);

int i = 0;
for(int i = 0; i < StartDay; i++)
cout<<"   ";

for(int i = 1; i <= DaysInMonth; i++)
{
  cout << setw(6) << i;
    if((i + StartDay - 1) % 7 == 0)
    {
      cout << endl;
    }
}
}

int getStartDay(int year, int month)
{
int StartDay1800 = 3;
int TotalDays = getTotalDays(year, month);

return(StartDay1800 +  TotalDays) % 7;
}

int getTotalDays(int year, int month)
{
int total = 0;
for(int i = 1800; i < year; i++) {
  if(isLeapYear(i))
  total = total + 366;
    else
  total = total + 365;
}

for(int i = 1; i < month; i++)
  total  = total + getDaysInMonth(year, i);

  return total;
}

 int getDaysInMonth(int year, int month)
{
if(month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
  return 31;
if(month == 4 || month == 6 || month == 9 || month == 11)
  return 30;
if(month == 2)
  return isLeapYear(year)? 29 : 28;
      return 0;
}

 bool isLeapYear(int year)
{
  return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
}