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#include<iostream>
#include <string>
#include <iomanip>
using namespace std;
const int TRUE = 1;
const int FALSE = 0;
int days_in_month[7]={31,28,31,30,31,30};
string months[7]=
{
"JANUARY",
"FEBRUARY",
"MARCH",
"APRIL",
"MAY",
"JUNE",
};
int inputyear()
{
int year;
cout << "What year do you want a calendar for? ";
cin >> year;
//Input validation for years between 2000 and 2020
if ((year < 2000) || (year > 2020))
{
cout << year << " is invalid. Please enter a year between 2000 and 2020.";
cout << "What year do you want a calendar for? " << endl;
cin >> year;
}
return year;
}
int determinedaycode(int year)
{
int daycode;
int d1, d2, d3;
d1 = (year - 1.)/ 4.0;
d2 = (year - 1.)/ 100.;
d3 = (year - 1.)/ 400.;
daycode = (year + d1 - d2 + d3) %7;
return daycode;
}
int determineleapyear(int year)
{
if(year% 4 == FALSE && year%100 != FALSE || year%400 == FALSE)
{
days_in_month[2] = 29;
return TRUE;
}
else
{
days_in_month[2] = 28;
return FALSE;
}
}
void calendar1(int year, int daycode)
{
int month, day;
cout << endl;
cout << setw(40) << "Calendar year for " << year << endl;
cout << "\n" << setw(15) << months[0];
cout << setw(25) << months[1];
cout << setw(20) << months[2];
cout << endl;
//Jan
cout << setw(2) << "S";
cout << setw(3) << "M" << setw(3) << "T";
cout << setw(3) << "W" << setw(3) << "T";
cout << setw(3) << "F" << setw(3) << "S";
for ( month = 0; month < 1; month++ )
{
//Correct the position for the first date
for ( day = 1; day <= 1 + daycode * 5; day++ )
{
cout << setw(2);
}
// Print all the dates for one month
for ( day = 1; day <= days_in_month[month]; day++ )
{
cout << right << setw(2) << day;
//Is day before Sat? Else start next line Sun.
if ( ( day + daycode ) % 7 > 0 )
cout << right << setw(3);
else
cout << "\n ";
}
// Set position for next month
daycode = ( daycode + days_in_month[month] ) % 7;
}
//Feb
cout << setw(5) << "S";
cout << setw(3) << "M" << setw(3) << "T";
cout << setw(3) << "W" << setw(3) << "T";
cout << setw(3) << "F" << setw(3) << "S";
for ( month = 1; month < 2; month++ )
{
//Correct the position for the first date
for ( day = 1; day <= 1 + daycode * 5; day++ )
{
cout << setw(2);
}
// Print all the dates for one month
for ( day = 1; day <= days_in_month[month]; day++ )
{
cout << right << setw(2) << day;
//Is day before Sat? Else start next line Sun.
if ( ( day + daycode ) % 7 > 0 )
cout << right << setw(3);
else
cout << "\n ";
}
// Set position for next month
daycode = ( daycode + days_in_month[month] ) % 7;
}
//Mar
cout << setw(5) << "S";
cout << setw(3) << "M" << setw(3) << "T";
cout << setw(3) << "W" << setw(3) << "T";
cout << setw(3) << "F" << setw(3) << "S";
for ( month = 2; month < 2; month++ )
{
//Correct the position for the first date
for ( day = 1; day <= 1 + daycode * 5; day++ )
{
cout << setw(2);
}
// Print all the dates for one month
for ( day = 1; day <= days_in_month[month]; day++ )
{
cout << right << setw(2) << day;
//Is day before Sat? Else start next line Sun.
if ( ( day + daycode ) % 7 > 0 )
cout << right << setw(3);
else
cout << "\n ";
}
// Set position for next month
daycode = ( daycode + days_in_month[month] ) % 7;
}
}
int main()
{
int year, daycode, leapyear;
year = inputyear();
daycode = determinedaycode(year);
determineleapyear(year);
calendar1(year, daycode);
cout << "\n";
return 0;
}
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