Display calender.. in the screen

 #include<iostream>

#include<iomanip>

#include<cmath>

#include<cstdlib>

#include<string.h>

#include<cstring>          //header files usefull to data opeartios

using namespace std;        //std files

class calendar

{

private:

int M;              //month

int Y;              //year

int FD;            //Firstday

public:

calendar(int =03 ,int=2016);

void SFD();                  //setfirstday

void print();

};

calendar::calendar(int _M,int _Y)

{

M= _M;

Y= _Y;

}

void calendar::SFD()

{

int D =1;                              //DAY

int y =Y -(14-M)/12;

int m =M+12*((14-M)/12)-2;

FD = (D+y+y/4/100+y/400+(31*m/12))%7;    //DAYS....

}

void calendar::print()

{

int NODIM;                //Noofdaysinmonth.

int FDOM=0;               //firstdayofmonth

int DOWC=0;              //dayofweekcounter

int DC=1;                //datecounter

cout<<"\nEnter month that you have on screen.";

cin>>M;

cout<<"\nEnter the year:";

cin>>Y;

switch(M)                //M=MONTH

{

case 1:

cout<<setw(21)<<" January "<<Y;

NODIM=31;

break;

case 2:

cout<<setw (21) <<" February "<<Y;

if(Y % 400 == 0 || ( Y % 4 == 0 && Y % 100 != 0))

{

NODIM=29;

    }

else

{

NODIM=28;

    }

break;

case 3:

cout<<setw(21)<<" March "<<Y;

NODIM=31;

break;

case 4:

cout<<setw(21)<<" April "<<Y;

NODIM=30;

break;

case 5:

cout<<setw(21)<<" May "<<Y;

NODIM=31;

break;

case 6:

cout<<setw(21)<<" June "<<Y;

NODIM=30;

break;

case 7:

cout<<setw(21)<<" July "<<Y;

NODIM=31;

break;

case 8:

cout<<setw(21)<<" August "<<Y;

NODIM=30;

break;

case 9:

cout<<setw(21)<<" Saptebar "<<Y;

NODIM=31;

break;

case 10:

cout<<setw(21)<<" Octobar "<<Y;

NODIM=30;

break;

case 11:

cout<<setw(21)<<" November "<<Y;

NODIM=31;

break;

case 12:

cout<<setw(21)<<" Decembar "<<Y;

NODIM=30;

break;

}

  //display the days at the top of each M

  cout<<"\n SUN  MON  TUE  WED  THU  FRI  SAT";

  cout<<"\n\n"<<setw(2);

  //determine where the firdst D begins.

  for(FDOM;FDOM<FD;++FDOM)

  {

  cout<<setw(14);

  }

  int TFD=FD;                      //tempfirstday

  DC=1;

  DOWC=TFD;

  //this loop represents the date display and continue to until.

  //the number of days in thet M have been reached.

  

  for(DC;DC<=NODIM;++DC)

  {

  cout<<DC<<setw(6);

  ++DOWC;

  if(DOWC>6)

  {

  cout<<"\n\n"<<setw(2);

  DOWC=0;

      }

  }

  cout<<"\n";

  TFD=DOWC+1;

}

int main()                  //main function

{

calendar c;

c.SFD();             //setfirstday

c.print();

return 0;

}