Calender

#include "iostream.h"
#include "conio.h"
#include "dos.h"

class calander
{
public:
step1 (int);
void month_name(int);
int no_days(int,int);
int leap(int);
};

int calander :: step1 (int y)
{
int x=y%7;
x+=(y-1)/4;
x-=(y-1)/100;
x+=(y-1)/400;
x=x%7;
if(x==0)
x=7;
if(leap(y))
x+=7;
return x;
}

void calander :: month_name(int m)
{
switch(m)
{
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; }}int calander :: no_days(int mon, int y){ int d; switch(mon) { case 1 : case 3 : case 5 : case 7 : case 8 : case 10: case 12: d=31; break; case 4 : case 6 : case 9 : case 11: d=30; break; case 2 : if(leap(y)) d=29; else d=28; break; } return d;}int calander :: leap (int y){ if (y%100==0) if (y%400==0) return 1; else return 0; else if (y%4==0) return 1; else return 0;}void main(){ restart: clrscr(); cout<<"Enter year : "; unsigned int y,m; cin>>y;
int x;
calander c;
x = c.step1(y);
int month[14][12]= {1,4,4,7,2,5,7,3,6,1,4,6,
2,5,5,1,3,6,1,4,7,2,5,7,
3,6,6,2,4,7,2,5,1,3,6,1,
4,7,7,3,5,1,3,6,2,4,7,2,
5,1,1,4,6,2,4,7,3,5,1,3,
6,2,2,5,7,3,5,1,4,6,2,4,
7,3,3,6,1,4,6,2,5,7,3,5,
1,4,5,1,3,6,1,4,7,2,5,7,
2,5,6,2,4,7,2,5,1,3,6,1,
3,6,7,3,5,1,3,6,2,4,7,2,
4,7,1,4,6,2,4,7,3,5,1,3,
5,1,2,5,7,3,5,1,4,6,2,4,
6,2,3,6,1,4,6,2,5,7,3,5,
7,3,4,7,2,5,7,3,6,1,4,6};
cout<<"Enter month (1 - 12) : "; month_input: cin>>m;
if(m<1 || m>12)
{
cout<<"Enter a valid month (1 - 12) : "; goto month_input; } clrscr(); c.month_name(m); cout << ' ' << y << "\n\n"; cout<< "Sun Mon Tue Wed Thu Fri Sat\n"; int j = month[x-1][m-1]+1, days = c.no_days(m,y); for (int i=0; i<=j-2; i++) cout<<' '; for(i=1; i<=days; i++) { cout << i <<' '; if(j==7) { cout << '\n'; j=1; } else j++; } cout<<"\n\nTry for another month? (y/n) : "; char ch; cin>>ch;
if(ch=='y' || ch=='Y')
goto restart;
else
{
clrscr();
cout << "\n\n\n\n\n\n\n\n\n";
cout.width(47);
cout << "Edited by Ankit Pokhrel";
delay(1200);
}
}