include<iostream>
#include<iomanip>
using namespace std;
int startDay(int , int );
int calcjan1(int, int );
void printMonth (int , int );
int days(int ,int , int );
int daysinmonth(int , int );
void printtitle(int , int );
int monthnum;
int main()
{
int jan=0;
char y;
char again;
int year=0; 
int month = 1;
int monthnum = 1;
do
{
    cout<<"Enter a year for a calendar you would like to view:";
    cin>>year; 
   int startDay = calcjan1(year, jan); 
   for(month = 1;month<= 12; month++,monthnum++)
    {
        int days = daysinmonth( month,year);
         
         printtitle(monthnum,year);
         printMonth(startDay,days);
         startDay = (startDay + days)%7;
     }
     cout<<"Would you like to enter another year?: Hit y to continue";
     cin>>again;
system("Pause");
}while (again=='y'); 
 
return 0;
}
//====================calcjan1===================
//calculates the first day of Jan. for year entered
int calcjan1(int year, int jan)
{
     jan = ((year-1)*365+((year-1)/4)-((year-1)/100)+(((year-1)/400))+1)%7;
    return jan; 
}//calcjan1
//===============printMonth==============
void printMonth (int startDay, int days)
{
     cout<<"Sun Mon Tue Wed Thu Fri Sat\n";
     cout<<"--- --- --- --- --- --- ---\n";
    for(int skipDay = 0;skipDay < startDay; skipDay++)
          cout<<"    ";
    int weekDay = startDay;
    for (int dayCount =1; dayCount <=days; dayCount++)
     {
         if (weekDay>6)
          {
               cout<<endl;
               weekDay =1; 
          }
         else 
               weekDay++;
          cout<<setw(3) <<dayCount<<" ";
      } 
     cout<<"\n--- --- --- --- --- --- ---\n";
   
    return;
} 
//===================printtitle==================
//print the month name & year
void printtitle(int monthnum,int year)
{
  do
  {
    int month= monthnum;
    switch(monthnum)
     {
         case 1: cout<<"January"<<setw(20)<<year<<endl;
              break;
         case 2: cout<<"February"<<setw(19)<<year<<endl;
              break;
         case 3: cout<<"March"<<setw(22)<<year<<endl;
              break;
         case 4: cout<<"April"<<setw(22)<<year<<endl;
              break;
         case 5: cout<<"May"<<setw(24)<<year<<endl;
              break;
         case 6: cout<<"June"<<setw(23)<<year<<endl;
              break;
         case 7: cout<<"July"<<setw(23)<<year<<endl;
              break;
         case 8: cout<<"August"<<setw(21)<<year<<endl;
              break;
         case 9: cout<<"September"<<setw(18)<<year<<endl;
              break;
         case 10: cout<<"October"<<setw(20)<<year<<endl;
              break;
         case 11: cout<<"November"<<setw(19)<<year<<endl;
              break;
         case 12: cout<<"December"<<setw(19)<<year<<endl;
              break;
          } 
     }while();   <RIGHT HERE
         
         return;
}//printtitle
//========================daysinmonth===================
//checks for leap year
int daysinmonth(int month,int year)
{ 
    switch(month)
     { 
         case 4:case 6:case 9:case 11: return 30;
              break;
         case 1:case 3:case 5:case 7:case 8:case 10:case 12: return 31;
              break;
         case 2: if((!(year % 4) && (year % 100) || !(year % 400)))
              return 28;
         else 
              return 29;
         break;
       }
     return 0;
}//daysinmonth

char *months[] = { "", "January","February", ... "December"}
cout<< months[monthnum] <<setw(20)<<year<<endl;