I wrote this program to display the calendar month from the year 2000 up to the year you want using C++ programming language. I use Codeblock as my integrated development environment in writing this program.
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Program Listing
calendar.cpp
#include<iostream>
#include<conio.h>
using namespace std;
/* This class is used for generating calendar */
class calendar
{
int i,j,days,mm,mon,k,z,p,yy,r;
int calen[5][7];
public:
void calen_call(void);
void display(void);
};
int main()
{
system("cls");
calendar c;
c.calen_call();
c.display();
getch();
}
void calendar::calen_call(void)
{
int month[12]={31,28,31,30,31,30,31,31,30,31,30,31};
cout <<"\n\n";
cout <<"\t\tCALENDAR GENERATOR IN C++";
cout <<"\n\n";
cout<<"\n\t\t\tCALENDAR FROM YEAR 2000...Onwards\n\n\n";
repeat:
cout<<"\tGive a Year [2000...Onwards] : ";
cin>>yy;
if(yy<=1999)
{
cout<<"\n\nWrong Selection. Try Again.";
goto repeat;
}
if(yy%4==0)
{
if(yy%100==0)
{
if(yy%400==0)
month[1]=29;
else
month[1]=28;
}
else
month[1]=29;
}
again:
cout<<"\tSelect Month [1-12] : ";
cin>>mon;
if(mon>12||mon<1)
{
cout<<"\tWrong Selection. Try Again. ";
goto again;
}
cout<<"\n\n\t\t\t\tYEAR "<<yy<<"\n\n";
switch(mon)
{
case 1:cout<<"\n\n\t\t\t\tJANUARY\n\n";break;
case 2:cout<<"\n\n\t\t\t\tFEBRUARY\n\n";break;
case 3:cout<<"\n\n\t\t\t\tMARCH\n\n";break;
case 4:cout<<"\n\n\t\t\t\tAPRIL\n\n";break;
case 10:cout<<"\n\n\t\t\t\tOCTOBER\n\n";break;
case 11:cout<<"\n\n\t\t\t\tNOVEMBER\n\n";break;
case 5:cout<<"\n\n\t\t\t\tMAY\n\n";break;
case 6:cout<<"\n\n\t\t\t\tJUNE\n\n";break;
case 7:cout<<"\n\n\t\t\t\tJULY\n\n";break;
case 8:cout<<"\n\n\t\t\t\tAUGUST\n\n";break;
case 9:cout<<"\n\n\t\t\t\tSEPTEMBER\n\n";break;
case 12:cout<<"\n\n\t\t\t\tDECEMBER\n\n";break;
default:cout<<"\n\nWRONG ENTRY";exit(0);
}
/* Start day of year 1999 i.e. Friday 1st January 1999 */
p=5;
/* Determination of start day of entered year [Calculating from 1999] */
for(r=1999;r<yy;r++)
{
if(r%4==0)
{
if(r%100==0)
{
if(r%400==0)
p=p+2;
else
p++;
}
else
p=p+2;
}
else
p++;
/* Resseting of start variable if last day is reached */
if(p==7)
p=0;
if(p==8)
p=1;
}
/* Start of Month iteration for entered year */
for(mm=0;mm<12;mm++)
{
/* Number of days a month has. Takes from the array defined above */
days=month[mm];
/* Start of days from */
k=0;
/* Setting all values in first row to 0 */
for(z=0;z<7;z++)
calen[0][z]=0;
/* Looping through the rows and columns of calen */
for(i=0;i<5;i++,p=0)
for(j=p;j<7&&k<days;j++)
{
/* Adding of days to the matrix */
calen[i][j]=k+1;
k++;
/* Checking for finish of days */
if(k==days&&i==4&&j<7)
{
/* Setting of remaining values to 0 */
for(p=j+1;p<7;p++)
calen[i][p]=0;
}
/* Putting values on first row if matrix is finished */
if(k<days&&i==4&&j==6)
{
for(p=0;p<7&&k<days;p++,k++)
calen[0][p]=k+1;
j=p-1;
}
/* Setting of j to -1 when days are finished */
if(k==days&&i==4&&j==6)
{
j=-1;
}
/* Special Check if days finish in 4th row e.g. 2009 february */
if(k==days&&i==3&&j==6)
{
/* Setting of final row to 0 */
for(p=0;p<7;p++)
calen[4][p]=0;
}
}
/* Resetting of start day for next month */
p=j;
/* Returning of loop if desired month is found */
if(mm+1==mon)
return;
}
}
/* Displays the values of Calen array */
void calendar::display()
{
/* Printing of day names */
cout<<"\n\tSUN\tMON\tTUE\tWED\tTHU\tFRI\tSAT\n\n";
/* Start of loop of rows */
for(i=0;i<5;i++)
{
/* Start of loop of columns */
for(j=0;j<7;j++)
cout<<"\t"<<calen[i][j];
cout<<"\n\n";
}
cout << "\n\n";
cout <<"\t\t\tEND OF PROGRAM";
cout << "\n\n";
system("pause");
}
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