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#include<iostream>
using namespace std;
#define TRUE 1 // Used for Leapyear function
#define FALSE 0 // Used for Leapyear function
char *months[] = //Month names for calendar
{
" ",
"\nJanuary",
"\nFebruary",
"\nMarch",
"\nApril",
"\nMay",
"\nJune",
"\nJuly",
"\nAugust",
"\nSeptember",
"\nOctober",
"\nNovember",
"\nDecember"
};
int days_in_month[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; //Used to list #of days in month
int determinedaycode(int year) //Function to determine day of the week
{
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 leapyear(int year) //Function for determining if year is a leapyear or not
{
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 calendar(int month, int year, int daycode) //Function to display the Month
{
int day, bar;
printf("%s", months[month], year);
cout << "\n\nSun Mon Tue Wed Thu Fri Sat" << endl;
for (bar = 1; bar <= 33; bar++) //Display '=" bar under days of the week
{
cout << '=';
}
cout << endl;
for (day = 1; day <= 1 + daycode * 5; day++) // Correct the postion for the first date
{
printf(" ");
}
for (day = 1; day <= days_in_month[month]; day++)
{
printf("%2d", day);
if ((day + daycode) % 7 > 0)
printf(" ");
else
printf("\n ");
}
}
int main(void) //Main input function
{
int year;
int month;
int daycode;
do
{
cout << "Enter a numeric month (1 - 12): " << endl;
cin >> month;
}
while (month < 1 || month > 12); //Constrains #'s to be 1-12
do
{
cout << "Enter a year after 1582: " << endl;
cin >> year;
}
while (year < 1582); //Allows for multiple try's to enter right year
daycode = determinedaycode(year);
leapyear(year);
calendar(month, year, daycode);
printf("\n");
return 0;
}
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