Calendar Project

#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
struct node {
    string title, description, month;
    int date=0;
    node* next=NULL;
}*first = NULL, * last = NULL;
void month(string month[], int x) {
    month[0] = "January"; month[1] = "February"; month[2] = "March"; month[3] = "April"; month[4] = "May";
    month[5] = "June"; month[6] = "July"; month[7] = "August"; month[8] = "September"; month[9] = "October";
    month[10] = "November"; month[11] = "December";
}
int check(string a) {
    int d=0;
    if (a == "Sunday") {d = 0;} else if (a == "Monday") {d = 1;} else if (a == "Tuesday") {d = 2;}
    else if (a == "Wednesday") {d = 3;} else if (a == "Thursday") {d = 4;} else if (a == "Friday") {d = 5;}
    else if (a == "Saturday") {d = 6;}
    return d;
}
int check1(string month,int date, struct node* p) {

    while (p != NULL) {
        if (p->month == month && p->date == date) {
            return date;

        }
        else {
            p = p->next;
        }
    }
    return 0;
}
void insert() {
    node* t;
    t = new node;
    cout << "a.Reminder title" << endl;
    getline(cin, t->title);
    cout << "b.Reminder description" << endl;
    getline(cin, t->description);
    cout << "c.Date" << endl;
    cin >> t->date;
    cout << "d.Month" << endl;
    cin >> t->month;
    t->next = NULL;
    if (first == NULL) {
        first = last= t;

    }
    else {
        last->next = t;
        last = t;
    }
}
void day() {
    string** day = new string * [1];
    *day = new string[7];
    day[0][0] = "Sun";
    day[0][1] = "Mon";
    day[0][2] = "Tue";
    day[0][3] = "Wed";
    day[0][4] = "Thu";
    day[0][5] = "Fri";
    day[0][6] = "Sat";
    for (int i = 0; i < 7; i++) {
        cout << right << setw(4) << day[0][i];
    }
    cout << endl;
    delete[] day[0];
    delete[] day;
}

int date(int starting_day,int total_day,string month) {
    int  n = 1,day=0;
    int row;
    if (starting_day == 5 && total_day == 31) {
        row = 6;
    }
    else if (starting_day == 5 && total_day == 30) {
        row = 5;
    }
    else if (starting_day == 6) {
        row = 6;
    }
    else {
        row = 5;
    }
    int** date = new int*[row];
    for (int i = 0; i < row; i++) {
        if (day >0  && day<7) {
            date[i] = new int[day];
            for (int j = 0; j<day ; j++) {
                date[i][j] = n;
                        n++;
            }
        }
        else {
            date[i] = new int[7];
            for (int j = 0; j < 7; j++) {
                if (i == 0 && j < starting_day) {
                    date[i][j] = NULL;
                }
                else {
                    date[i][j] = n;
                    day = total_day - n;
                    n++;
                }
            }
        }

    }
    for (int i = 0; i < row; i++) {
        for (int j = 0; j < 7; j++) {
            if (i == 0 && j < starting_day) {
                cout<<"    ";
            }
            else {
                int k=check1(month,date[i][j],first);
                if (k == date[i][j]) {
                    if (k < 10) {
                        cout << right << setw(3) << "*" << date[i][j];
                    }
                    else {
                        cout << right << setw(2) << "*" << date[i][j];
                    }
                }
                else {
                    cout << right << setw(4) << date[i][j];
                }
            }
            if (date[i][j] == total_day) {
                cout << endl;
             starting_day = j + 1;
             if (starting_day == 7) {
                 starting_day = 0;
             }
             break;
            }
        }
        cout << endl;
    }
    cout << endl;

    for (int i = 0; i < row; i++) {
        delete[] date[i];
    }
    delete[] date;
    return starting_day;
}
void calendar(string a, int year,string month[],int x) {
    int starting_day, total_day;
    starting_day = check(a);
    cout << "-----------"<<month[0]<<"-------------" << endl;
    total_day = 31;
    day();
    starting_day = date(starting_day, total_day,month[0]);


    cout << "------------" << month[1] << "-------------" << endl;
    if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
        total_day = 29;
    }
    else {
        total_day = 28;
    }
    day();
    starting_day = date(starting_day, total_day,month[1]);

    cout << "------------" << month[2] << "-------------" << endl;
    total_day = 31;
    day();
    starting_day = date(starting_day, total_day,month[2]);


    cout << "------------" << month[3] << "-------------" << endl;
    total_day = 30;
    day();
    starting_day = date(starting_day, total_day,month[3]);


    cout << "------------" << month[4] << "-------------" << endl;
    total_day = 31;
    day();
    starting_day = date(starting_day, total_day,month[4]);


    cout << "------------" << month[5] << "-------------" << endl;
    total_day = 30;
    day();
    starting_day = date(starting_day, total_day, month[5]);


    cout << "------------" << month[6] << "-------------" << endl;
    total_day = 31;
    day();
    starting_day = date(starting_day, total_day, month[6]);


    cout << "------------" << month[7] << "-------------" << endl;
    total_day = 31;
    day();
    starting_day = date(starting_day, total_day, month[7]);
    cout << "------------" << month[8] << "-------------" << endl;
    total_day = 30;
    day();
    starting_day = date(starting_day, total_day, month[8]);
    cout << "------------" << month[9] << "-------------" << endl;
    total_day = 31;
    day();
    starting_day = date(starting_day, total_day, month[9]);
    cout << "------------" << month[10] << "-------------" << endl;
    total_day = 30;
    day();
    starting_day = date(starting_day, total_day, month[10]);
    cout << "------------" << month[11] << "-------------" << endl;
    total_day = 31;
    day();
    starting_day = date(starting_day, total_day, month[11]);

}
void update(struct node*p) {
    string a, b;
    int c;
    cout << "a.Reminder title" << endl;
    getline(cin, a);
    cout << "c.Date" << endl;
    cin >> c;
    cin.ignore();
    cout << "d.Month" << endl;
    cin >> b;
    while (p != NULL) {
        if (p->title == a && p->date == c && p->month == b) {
            cout << "Update your reminder: " << endl;
            cout << "a.Reminder title" << endl;
            cin.ignore();
            getline(cin, p->title);
            cout << "b.Date" << endl;
            cin >> p->date;
            cin. ignore();
            cout << "c.Reminder description" << endl;
            getline(cin,p->description);
            cout << "d.Month" << endl;
            cin >> p->month;
            return;
        }
        else {
            p = p->next;
        }
    }

}
void delete1(struct node*p) {
    string a, b;
    int c;
    cout << "a.Reminder title" << endl;
    getline(cin, a);
    cout << "c.Date" << endl;
    cin >> c;
    cin.ignore();
    cout << "d.Month" << endl;
    cin >> b;
    node* q = NULL;
    int index = 1;
    while (p != NULL) {
        if (p->title == a && p->date == c && p->month == b) {
            break;
        }
        else {
            index++;
            p = p->next;
        }
    }
    p = first;
    while (p != NULL) {
            if (index==1) {
                q = first;
                first = first->next;
                delete q;
                return;
            }
            else {
                for (int i = 0; i < index-1; i++) {
                    q = p;
                    p = p->next;
                }
                q->next = p->next;
                delete p;
                return;
            }
    }
}
void reminders_of_a_specific_month() {
    string x;
    cout << "Enter the month name: " << endl;
    cin >> x;
    struct node* p = first;
    while (p != NULL) {
        if (p->month == x) {
            cout << "a.Reminder title:" << endl;
            cout << p->title << endl;
            cout << "b.Reminder description:" << endl;
            cout << p->description << endl;
            cout << "c.Date" << endl;
            cout << p->date << endl;
            cout << "d.Month" << endl;
            cout << p->month << endl;
        }
        p = p->next;
    }
}
int main() {
    int year;
    string a;
    cout << "Input:" << endl;
    cout << "Year: ";
    cin >> year;
    cout << "Starting day of the year : ";
    cin >> a;
    string mon[12];
    month(mon, 12);
    calendar(a,year,mon,12);
    for (int i = 1; ; i++) {
        cout << "You can perform the following operation: " << endl;
        cout << "Press 1 if you want to add reminder" << endl;
        cout << "Press 2 if you want to update reminder" << endl;
        cout << "Press 3 if you want to delete a specific reminder" << endl;
        cout << "Press 4 if you want to view all the reminders of a specific month" << endl;
        cout << "Press 5 if you want to exit from the calendar" << endl;
        int b;
        cin >> b;
        cin.ignore();
        if (b == 1) {
            insert();
            calendar(a, year, mon, 12);
        }
        else if (b == 2) {
            update(first);
            calendar(a, year, mon, 12);
        }
        else if (b == 3) {
            delete1(first);
            calendar(a, year, mon, 12);
        }
        else if (b == 4) {
            reminders_of_a_specific_month();
        }
        else if (b == 5) {
            return 0;
        }
    }
}