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#include <iostream>
using namespace std;
#include <iomanip>
#include <cassert>
int getYear()
{
int year = 0;
cout << "Enter year: ";
cin >> year;
while (year < 1753)
{
cout << "Year must be 1753 or later.\n"
<< "Enter year: ";
cin >> year;
}
return year;
}
int getMonth()
{
int month = 0;
cout << "Enter a month number: ";
cin >> month;
while (month <= 0 || month > 12)
{
cout << "Month must be between 1 and 12.\n"
<< "Enter a month number: ";
cin >> month;
}
return month;
}
bool isLeapYear(int year)
{
if (year % 4 != 0)
return false;
if (year % 400 == 0)
return true;
return (year % 100 != 0);
}
int numDaysInMonth(int year, int month)
{
if (month == 1 || month == 3 || month == 5 || month == 7 || month ==
8 || month == 10 || month == 12)
return 31;
if (month == 4 || month == 6 || month == 9 || month == 11)
return 30;
if (month == 2)
{
if (isLeapYear(year))
return 29;
else
return 28;
}
}
int numDaysInYear(int year)
{
if (isLeapYear(year))
return 365;
else
return 365;
}
int computeOffset(int year, int month)
{
int numDays=0;
for (int count = 1753; count < year; count++)
numDays += numDaysInYear(count);
for (int count =1; count < month; count++)
numDays += numDaysInMonth(year, count);
int offset = numDays % 7;
return offset;
}
void displayTable(int numDays, int offset)
{
int dow = 1;
cout << " Su Mo Tu We Th Fr Sa\n ";
if (offset == 6)
offset = -1;
for (int count =0; count <= offset; count++)
{
cout << " ";
dow++;
}
for (int count = 1; count <= numDays; count++)
{
cout << setw(2) << count;
if (dow % 7 == 0 && count < numDays)
cout << endl << " ";
else if (count < numDays)
cout << " ";
else
cout << endl;
dow++;
}
}
void displayHeader(int year, int month)
{
if (month == 1)
cout << "January, ";
else if (month == 2)
cout << "February, ";
else if (month == 3)
cout << "March, ";
else if (month == 4)
cout << "April, ";
else if (month == 5)
cout << "May, ";
else if (month == 6)
cout << "June, ";
else if (month == 7)
cout << "July, ";
else if (month == 8)
cout << "August, ";
else if (month == 9)
cout << "September, ";
else if (month == 10)
cout << "October, ";
else if (month == 11)
cout << "November, ";
else
cout << "December, ";
cout << year << endl;
}
void display(int year,int month, int offset)
{
int numDays = numDaysInMonth(year, month);
displayHeader(year, month);
displayTable(numDays, offset);
}
int main()
{
int month = getMonth();
int year = getYear();
cout << endl;
int offset = computeOffset(year, month);
display(year, month, offset);
return 0;
}
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