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#include <iostream>
#include <iomanip>
using namespace std;
bool isLeapYear(int month, int year);
bool isLeapYear(int month, int year)
{
if ( year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
return true;
else
return false;
}
void display(int month, int year, int numDays, int offset)
{
int days;
cout << " Su Mo Tu We Th Fr Sa\n";
switch (offset) {
case 0:
cout << setw(4 * (offset + 1) % 7) << " ";
break;
case 1:
cout << setw(4 * (offset + 1) % 7) << " ";
break;
case 2:
cout << setw(4 * (offset + 1) % 7) << " ";
break;
case 3:
cout << setw(4 * (offset + 1) % 7) << " ";
break;
case 4:
cout << setw(4 * (offset + 1) % 7) << " ";
break;
case 5:
cout << setw(4 * (offset + 1) % 7) << " ";
break;
case 6:
cout << setw(0) << " ";
break;
}
for (days = 1; days <= numDays; days++)
{
if ((days + offset) % 7 == 0 && days != 0 )
cout << "\n";
cout << " " << setw(2) << days;
}
cout << "\n";
}
void computeOffset(int month, int year, int numDays)
{
int offset = 0;
int count = year - 1753;
for (int iYear = 0; iYear < count; iYear++)
{
offset = (offset + 365 + isLeapYear(month, year)) % 7;
}
for (int iMonth = 1; iMonth < month; iMonth++)
{
offset = (offset + numDays) % 7;
}
display(month, year, numDays, offset);
}
void numDaysMonth(int month, int year)
{
int numDays = -1;
switch (month)
{
case 1:
numDays = 31;
break;
case 2:
{
if (isLeapYear(month, year) == true)
numDays = 29;
else
numDays = 28;
break;
}
case 3:
numDays = 31;
break;
case 4:
numDays = 30;
break;
case 5:
numDays = 31;
break;
case 6:
numDays = 30;
break;
case 7:
numDays = 31;
break;
case 8:
numDays = 31;
break;
case 9:
numDays = 30;
break;
case 10:
numDays = 31;
break;
case 11:
numDays = 30;
break;
case 12:
numDays = 31;
break;
}
computeOffset(month, year, numDays);
}
void displayHeader(int month, int year)
{
switch (month) {
case 1:
cout << "January, " << year << endl;
break;
case 2:
cout << "February, " << year << endl;
break;
case 3:
cout << "March, " << year << endl;
break;
case 4:
cout << "April, " << year << endl;
break;
case 5:
cout << "May, " << year << endl;
break;
case 6:
cout << "June, " << year << endl;
break;
case 7:
cout << "July, " << year << endl;
break;
case 8:
cout << "August, " << year << endl;
break;
case 9:
cout << "September, " << year << endl;
break;
case 10:
cout << "October, " << year << endl;
break;
case 11:
cout << "November, " << year << endl;
break;
case 12:
cout << "December, " << year << endl;
break;
default:
cout << "Value not read correctly.";
}
numDaysMonth(month, year);
}
void getInfo()
{
int month = -1;
int year = -2;
while (month > 12 || month < 1)
{
cout << "Enter a month number: ";
cin >> month;
if (month > 12 || month < 1)
{
cout << "Month must be between 1 and 12." << endl;
}
}
while (year < 1753)
{
cout << "Enter year: ";
cin >> year;
if (year < 1753)
{
cout << "Year must be 1753 or later." << endl;
}
}
cout << endl;
displayHeader(month, year);
}
int main()
{
getInfo();
return 0;
}
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