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Making a calendar in C++

stridexr (75)
Hi,

I'm trying to make a calendar but it comes out wrong. This is the output I get:

             January 2009
Sun   Mon   Tue   Wed   Thu   Fri   Sat

 1     2     3     4     5     6     7     8     9    10    11    12    13    14
    15    16    17    18    19    20    21    22    23    24    25    26    27
  28    29    30    31
            February 2020
Sun   Mon   Tue   Wed   Thu   Fri   Sat

 1     2     3     4     5     6     7     8     9    10    11    12    13    14
    15    16    17    18    19    20    21    22    23    24    25    26    27


Here is my code:

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//Calendar.h
#include "weekDay.h"
#include "exDate.h"
#include <string>

class Calendar
{
private:
	int month;
	int year;
	int firstday;
public:
	Calendar(int =1, int =1500);
	void setFirstDay();
	void print();
};



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//Calendar.cpp
#include <iostream>
#include <iomanip>
using namespace std;
#include "Cal.h"

Calendar :: Calendar (int _month, int _year){

	month = _month;
	year = _year;
}

void Calendar :: setFirstDay(){
//This part determines which day will be the first day of that year (0 for Sunday, 1 for Monday, etc.)
	int day=1;
	int y = year - (14-month)/12;
	int m = month +12 * ((14-month) / 12) -2;
	firstday= (day + y + y / 4 - y / 100 + y / 400 + (31 * m / 12)) % 7;
}

void Calendar :: print(){

	int NumberOfDaysInMonth;
	int FirstDayOfMonth = 0;
	int DayOfWeekCounter = 0;
	int DateCounter = 1;

	switch (month)
	{
	  case 1:
		cout<<setw(21)<<"January "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 2:
		cout<<setw(21)<<"February "<<year;
		if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
		  NumberOfDaysInMonth = 29;
		else
		  NumberOfDaysInMonth = 28;
	  break;
	  case 3:
		cout<<setw(21)<<"March "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 4:
		cout<<setw(21)<<"April "<<year;
		NumberOfDaysInMonth = 30;
	  break;
	  case 5:
		cout<<setw(21)<<"May "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 6:
		cout<<setw(21)<<"June "<<year;
		NumberOfDaysInMonth = 30;
	  break;
	  case 7:
		cout<<setw(21)<<"July "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 8:
		cout<<setw(21)<<"August "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 9:
		cout<<setw(21)<<"September "<<year;
		NumberOfDaysInMonth = 30;
	  break;
	  case 10:
		cout<<setw(21)<<"October "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 11:
		cout<<setw(21)<<"November "<<year;
		NumberOfDaysInMonth = 30;
	  break;
	  case 12:
		cout<<setw(21)<<"December "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	}

//Display the days at the top of each month

	cout<<"\nSun   Mon   Tue   Wed   Thu   Fri   Sat";
	cout<<"\n\n"<<setw(2);

//Determine where the first day begins

	for (FirstDayOfMonth; FirstDayOfMonth < firstday; ++FirstDayOfMonth)
	{

		cout<<setw(6);
	}

	int tempfirstday=firstday;
	DateCounter = 1;
	DayOfWeekCounter = tempfirstday;
//This loop represents the date display and will continue to run until 
//the number of days in that month have been reached
	for (DateCounter; DateCounter <= NumberOfDaysInMonth; ++DateCounter)
	{
		cout<<DateCounter<<setw(6);
		++DayOfWeekCounter;
		if (DayOfWeekCounter > 6)
		{
			cout<<"\n\n"<<setw(2);
			DayOfWeekCounter = 0;
		}
	}
	cout << " \n" ;

	tempfirstday = DayOfWeekCounter + 1;
}


And in the main it just creates two calendar objects, one for January 2009, the other for February 2020 and prints them.

Any ideas?
Last edited on
Caprico (226)
I edited your code a little bit, to be able to run it on my own PC.. Here, I've changed a few lines...


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//Calendar.h
#include<iostream.h>
#include<string.h>
#include<conio.h>
#include<iomanip.h>

class Calendar
{
private:
	int month;
	int year;
	int firstday;
public:
	Calendar(int =11, int =2011);
	void setFirstDay();
	void print();
};




//Calendar.cpp

Calendar :: Calendar (int _month, int _year){

	month = _month;
	year = _year;
}

void Calendar :: setFirstDay(){
//This part determines which day will be the first day of that year (0 for Sunday, 1 for Monday, etc.)
	int day=1;
	int y = year - (14-month)/12;
	int m = month +12 * ((14-month) / 12) -2;
	firstday= (day + y + y / 4 - y / 100 + y / 400 + (31 * m / 12)) % 7;
}

void Calendar :: print(){

	int NumberOfDaysInMonth;
	int FirstDayOfMonth = 0;
	int DayOfWeekCounter = 0;
	int DateCounter = 1;

	switch (month)
	{
	  case 1:
		cout<<setw(21)<<"January "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 2:
		cout<<setw(21)<<"February "<<year;
		if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
		  NumberOfDaysInMonth = 29;
		else
		  NumberOfDaysInMonth = 28;
	  break;
	  case 3:
		cout<<setw(21)<<"March "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 4:
		cout<<setw(21)<<"April "<<year;
		NumberOfDaysInMonth = 30;
	  break;
	  case 5:
		cout<<setw(21)<<"May "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 6:
		cout<<setw(21)<<"June "<<year;
		NumberOfDaysInMonth = 30;
	  break;
	  case 7:
		cout<<setw(21)<<"July "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 8:
		cout<<setw(21)<<"August "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 9:
		cout<<setw(21)<<"September "<<year;
		NumberOfDaysInMonth = 30;
	  break;
	  case 10:
		cout<<setw(21)<<"October "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	  case 11:
		cout<<setw(21)<<"November "<<year;
		NumberOfDaysInMonth = 30;
	  break;
	  case 12:
		cout<<setw(21)<<"December "<<year;
		NumberOfDaysInMonth = 31;
	  break;
	}

//Display the days at the top of each month

	cout<<"\nSun   Mon   Tue   Wed   Thu   Fri   Sat";
	cout<<"\n\n"<<setw(2);

//Determine where the first day begins

	for (FirstDayOfMonth; FirstDayOfMonth < firstday; ++FirstDayOfMonth)
	{

		cout<<setw(14);
	}

	int tempfirstday=firstday;
	DateCounter = 1;
	DayOfWeekCounter = tempfirstday;
//This loop represents the date display and will continue to run until
//the number of days in that month have been reached
	for (DateCounter; DateCounter <= NumberOfDaysInMonth; ++DateCounter)
	{
		cout<<DateCounter<<setw(6);
		++DayOfWeekCounter;
		if (DayOfWeekCounter > 6)
		{
			cout<<"\n\n"<<setw(2);
			DayOfWeekCounter = 0;
		}
	}
	cout << " \n" ;

	tempfirstday = DayOfWeekCounter + 1;
}

void main()                    //This was to just be able to run your class...
{
	Calendar c;
	clrscr();
	c.setFirstDay();
	c.print();
	getch();
}


I changed line 110, from setw(6) to setw(14)...
and I got a decent output for November 2011. Perfect alignment. Try it out...

EDIT: Ohk, I found the problem. The thing is, depending on what the first day is (Monday, Tuesday.....), the setw has to be changed. So you'll have to experiment a little bit to find out...
Last edited on
Bibek Subedi (26)
if your really interest in Building Calender Application then you can check it out.....
http://programming-technique.blogspot.com/2011/09/mini-project-calendar-application-using.html
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