Question

. In this lab you will be making a text-based calendar program that looks like:

JANUARY 2018

S M Tu W Th F S

1 2 3 4 5 6   

7 8 9 10 11 12 13

14 15 16 17 18 19 20   

21 22 23 24 25 26 27

28 29 30 31

Your calendar should be able to print months in the future and in the past.

Activity #1

In C++ create a calendar program that has the following two functions:

▪ printMonth – this function has two parameters (month, year) and will print out the calendar for the specified month in the format discussed in the introduction to this lab.

▪ printYear – this function has one parameter (year) and will print out the calendar for all 12 months in that year.

In addition to the above functions you should also create a main function that will test your program. In the main function the program should ask the user if he/she wants a year or month calendar. If the user wants a year calendar the program should input the year. If the user wants a month calendar the program should input the month and year.

In order to print the calendar for a given month you need to write an algorithm to determine which day of the week the first day of the month is on. You can determine this using the following information:

1. Number of days in each month.

a. January – 31 days

b. February – 28 or 29 days

c. March – 31 days

d. April – 30 days

e. May – 31 days

f. June – 30 days

g. July – 31 days

h. August – 31 days

i. September – 30 days

j. October – 31 days

k. November – 30 days

l. December – 31 days

2. Leap years.

In a leap year February has an extra day, which is why February can be either 28 or 29 days long. Years that are evenly divisible by 4 are leap years except when the year is also evenly divisible by 100. There is also an exception to this rule since years that are evenly divisible by 100 but also evenly divisible by 400 are considered leap years. For example:

• 2009 is not a leap year because it is not evenly divisible by 4.

• 2008 was a leap year because it was evenly divisible by 4 and not evenly divisible by 100.

• 1900 was not a leap year because even though it was evenly divisible by 4 it was also evenly divisible by 100 (and not evenly divisible by 400).

• 2000 was a leap year because it is evenly divisible by 4, evenly divisible by 100 and evenly divisible by 400.

Answer 1

#include <iostream>
#include <iomanip>

using namespace std;

char months[13][100] = {"", "January","February","March","April","May","June","July","August","September","October","November","December"};
char days[7][100] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};

int isLeapYear(int year) {
    return (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0));
}

unsigned int dayOfWeek(int y, int m, int d) { 
        m = (m + 9) % 12;
        y -= m / 10;
        unsigned int dn = 365*y + y/4 - y/100 + y/400 + (m*306 + 5)/10 + (d - 1);

        return (dn + 3) % 7;
}

int findDaysInMonth(int year, int month) {
        int days = 31;
        if((month==6) || (month==4) || (month==11) || (month==9)) {
                days = 30;
        }else if((month==2) && isLeapYear(year)) {
                days = 29;
        } else if(month == 2) {
                days = 28;
        }
        return days;
}

int printMonthCalendar(int year, int month) {
        int numOfDays = findDaysInMonth(year, month); 
        int startingDay = dayOfWeek(year, month, 1);
        for(int i=0; i<7; i++) {
                cout << setw(5) << days[i];
        }
        cout << endl;
        
        for(int i=1; i<startingDay; i++) {
                cout << setw(5) << "";
        }

        int day = 1;
        int weekDay = startingDay - 1;
        while(day <= numOfDays) {
                cout << setw(5) << day;
                day++;
                weekDay++;
                if(weekDay == 7) {
                        cout << endl;
                        weekDay = 0;
                }
        }
        cout << endl;
        return weekDay + 1;
}

void printYearCalendar(int year) {
        for(int month=1; month<=12; month++) {               
                cout << months[month] << ", " << year << endl;
                printMonthCalendar(year, month);
                cout << endl;
        }
}

int main() {
        // to print year calendar
        printYearCalendar(2019);

        // to print month calendar
        cout << endl << endl << "Month calendar" << endl;
        printMonthCalendar(2019, 10);
}

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