calender.cpp

#include <iostream>
#include <iomanip>
#include <conio.h>
#include <time.h>

using namespace std;
void printCalender(int year)
{
	int t[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4 ,6, 2, 4 };
	int mDays[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
	string monthList[] = { "January", "February","March", "April","May", "June", "July", "August", "September", "October", "November", "December"};
		
	cout<<"  ----------------------------------------"<<endl;
	cout<<"              Calender :"<<year<<endl;
	cout<<"  ----------------------------------------"<<endl<<endl;
	int days;
	int current;
	
	int y = year -1;
	current = ( y + y/4 -y/100 +y/400 + t[0] + 1) % 7;
	
	for(int i=0; i < 12; i++)
	{
		if(i==1)
		{
			if (year%400 ==0 || (year %4 == 0 && year %100 !=100))
			{
				days = 29;
			}
			else 
			{
				days = mDays[i];
				
			}
		}
		else 
				days = mDays[i];	
			
		cout<<endl<<"   -------------" <<monthList[i]<<"---------------"<<endl;
		cout<<"   Sun Mon Tue Wed Thu Fri Sat"<<endl;
			
		int k;
		for (k= 0; k< current; k++)
			cout<<"     ";	
			
		for(int j =1; j <= days; j++)
		{
			k++;
			cout<<setw(5)<<j;
			if (k>6)
			{
				k= 0;
				cout<<endl;
			}				
		}
		if (k)
			cout<<endl;
		
		current = k;
	}
		
	return ;
}
int main() 
{
	system("cls");
	
	time_t ttime =time(0);
	tm *local_time = localtime(&ttime);
	
	int year = 1900 + local_time->tm_year;
	char option;
	
	do{
		system("cls");
		printCalender(year);
		
		cout<<endl<<endl;
		cout<<"Press "<<endl;
		cout<<"- n for next year"<<endl;
		cout<<"- p for previous year"<<endl;
		cout<<"- e for Exit"<<endl;
		
		option = getche();
		switch(option){
			case 'n':
				year++;
				break;
			case 'p':
				year --;
		}
	}while(option!='e' && option!='E');
	return 0;
}