Calendar Application Gaming Project in C++

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#include <iostream>
#include <iomanip>

using namespace std;

// Function to check if the year is a leap year
bool isLeapYear(int year) {
    if (year % 4 == 0) {
        if (year % 100 == 0) {
            if (year % 400 == 0)
                return true;
            else
                return false;
        } else
            return true;
    } else
        return false;
}

// Function to get the number of days in a month
int getDaysInMonth(int month, int year) {
    switch (month) {
        case 1: return 31; // January
        case 2: return isLeapYear(year) ? 29 : 28; // February
        case 3: return 31; // March
        case 4: return 30; // April
        case 5: return 31; // May
        case 6: return 30; // June
        case 7: return 31; // July
        case 8: return 31; // August
        case 9: return 30; // September
        case 10: return 31; // October
        case 11: return 30; // November
        case 12: return 31; // December
        default: return 0;
    }
}

// Function to calculate the day of the week for the 1st of a month
int getStartDay(int month, int year) {
    int day = 1; // First day of the month
    int century = year / 100;
    int yearInCentury = year % 100;
    if (month == 1 || month == 2) {
        month += 12;
        yearInCentury--;
    }
    int dayOfWeek = (day + (13 * (month + 1)) / 5 + yearInCentury + yearInCentury / 4 + century / 4 + 5 * century) % 7;
    return (dayOfWeek + 5) % 7; // Adjusting to start from Monday
}

// Function to display the calendar for a given month and year
void displayCalendar(int month, int year) {
    string months[] = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
    cout << "\n   " << months[month - 1] << " " << year << "\n";
    cout << " Mo Tu We Th Fr Sa Su\n";

    int daysInMonth = getDaysInMonth(month, year);
    int startDay = getStartDay(month, year);

    // Print leading spaces for the first week
    for (int i = 0; i < startDay; i++)
        cout << "   ";

    for (int day = 1; day <= daysInMonth; day++) {
        cout << setw(2) << day << " ";
        if ((day + startDay) % 7 == 0)
            cout << "\n"; // New line after Sunday
    }
    cout << "\n";
}

int main() {
    int month, year;
    cout << "Enter month (1-12): ";
    cin >> month;
    cout << "Enter year: ";
    cin >> year;

    displayCalendar(month, year);

    return 0;
}

#include <iostream>

#include <iomanip>

using namespace std;

// Function to check if the year is a leap year

bool isLeapYear(int year) {

if (year % 4 == 0) {

if (year % 100 == 0) {

if (year % 400 == 0)

return true;

else

return false;

} else

return true;

} else

return false;

}

// Function to get the number of days in a month

int getDaysInMonth(int month, int year) {

switch (month) {

case 1: return 31; // January

case 2: return isLeapYear(year) ? 29 : 28; // February

case 3: return 31; // March

case 4: return 30; // April

case 5: return 31; // May

case 6: return 30; // June

case 7: return 31; // July

case 8: return 31; // August

case 9: return 30; // September

case 10: return 31; // October

case 11: return 30; // November

case 12: return 31; // December

default: return 0;

}

// Function to calculate the day of the week for the 1st of a month

int getStartDay(int month, int year) {

int day = 1; // First day of the month

int century = year / 100;

int yearInCentury = year % 100;

if (month == 1 || month == 2) {

month += 12;

yearInCentury--;

}

int dayOfWeek = (day + (13 * (month + 1)) / 5 + yearInCentury + yearInCentury / 4 + century / 4 + 5 * century) % 7;

return (dayOfWeek + 5) % 7; // Adjusting to start from Monday

}

// Function to display the calendar for a given month and year

void displayCalendar(int month, int year) {

string months[] = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};

cout << "\n " << months[month - 1] << " " << year << "\n";

cout << " Mo Tu We Th Fr Sa Su\n";

int daysInMonth = getDaysInMonth(month, year);

int startDay = getStartDay(month, year);

// Print leading spaces for the first week

for (int i = 0; i < startDay; i++)

cout << " ";

for (int day = 1; day <= daysInMonth; day++) {

cout << setw(2) << day << " ";

if ((day + startDay) % 7 == 0)

cout << "\n"; // New line after Sunday

}

cout << "\n";

}

int main() {

int month, year;

cout << "Enter month (1-12): ";

cin >> month;

cout << "Enter year: ";

cin >> year;

displayCalendar(month, year);

return 0;

}

Explanation:

Leap Year Calculation:
- The function isLeapYear checks whether a given year is a leap year. A leap year occurs every 4 years, but years divisible by 100 are not leap years unless they are also divisible by 400.
Days in a Month

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:
- The function getDaysInMonth returns the number of days in a particular month, considering if it’s February in a leap year.
Start Day Calculation:
- The function getStartDay calculates the day of the week for the 1st of a given month using Zeller’s Congruence, adjusted to start from Monday.
Calendar Display:
- The function displayCalendar prints the calendar for the input month and year. It starts by printing the days of the week, then aligns the dates according to the starting day of the month.
Main Function:
- The main function takes user input for the month and year and calls the displayCalendar function to show the calendar.

Possible Enhancements:

Event Scheduling: You could extend this program by allowing users to schedule events on specific dates.
Navigation: Adding functionality to move between months and years interactively.
Graphical Interface: Implementing a graphical interface for easier interaction.

Explanation:

Possible Enhancements:

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