Hacktoberfestmine/Calendar.c at main · pythonites/Hacktoberfestmine · GitHub

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#include <stdio.h>
int dayNumber(int day, int month, int year)
{

    static int t[] = {0, 3, 2, 5, 0, 3,
                      5, 1, 4, 6, 2, 4};
    year -= month < 3;
    return (year + year / 4 - year / 100 + year / 400 + t[month - 1] + day) % 7;
}
char *getMonthName(int monthNumber)
{
    char *month;

    switch (monthNumber)
    {
    case 0:
        month = "January";
        break;
    case 1:
        month = "February";
        break;
    case 2:
        month = "March";
        break;
    case 3:
        month = "April";
        break;
    case 4:
        month = "May";
        break;
    case 5:
        month = "June";
        break;
    case 6:
        month = "July";
        break;
    case 7:
        month = "August";
        break;
    case 8:
        month = "September";
        break;
    case 9:
        month = "October";
        break;
    case 10:
        month = "November";
        break;
    case 11:
        month = "December";
        break;
    }
    return month;
}
int numberOfDays(int monthNumber, int year)
{
    // January
    if (monthNumber == 0)
        return (31);

    // February
    if (monthNumber == 1)
    {
        // If the year is leap then Feb
        // has 29 days
        if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
            return (29);
        else
            return (28);
    }

    // March
    if (monthNumber == 2)
        return (31);

    // April
    if (monthNumber == 3)
        return (30);

    // May
    if (monthNumber == 4)
        return (31);

    // June
    if (monthNumber == 5)
        return (30);

    // July
    if (monthNumber == 6)
        return (31);

    // August
    if (monthNumber == 7)
        return (31);

    // September
    if (monthNumber == 8)
        return (30);

    // October
    if (monthNumber == 9)
        return (31);

    // November
    if (monthNumber == 10)
        return (30);

    // December
    if (monthNumber == 11)
        return (31);
}
void printCalendar(int year)
{
    printf("	 Calendar - %d\n\n", year);
    int days;
    int current = dayNumber(1, 1, year);
    for (int i = 0; i < 12; i++)
    {
        days = numberOfDays(i, year);
        printf("\n ------------%s-------------\n",
               getMonthName(i));
        printf(" Sun Mon Tue Wed Thu Fri Sat\n");
        int k;
        for (k = 0; k < current; k++)
            printf("	 ");

        for (int j = 1; j <= days; j++)
        {
            printf("%5d", j);

            if (++k > 6)
            {
                k = 0;
                printf("\n");
            }
        }

        if (k)
            printf("\n");

        current = k;
    }

    return;
}
int main()
{
    int year = 2021; //by default i have assigned 2021 calendar you can assign any year and get the calendar for that year.
    printCalendar(year);
    return 0;
}