Print calendar for a given year - GeeksforGeeks

Print calendar for a given year - GeeksforGeeks
Problem: To print the calendar of any given year. The program should be such that it can prints the calendar of any input year.

/*A Function that returns the index of the day

  of the date- day/month/year

  For e.g-

 

  Index     Day

  0         Sunday

  1         Monday

  2         Tuesday

  3         Wednesday

  4         Thursday

  5         Friday

  6         Saturday*/

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;

}

 

/*

  A Function that returns the name of the month

  with a given month number

 

  Month Number     Name

  0                January

  1                February

  2                March

  3                April

  4                May

  5                June

  6                July

  7                August

  8                September

  9                October

  10               November

  11               December */

string getMonthName(int monthNumber)

{

    string months[] = {"January", "February", "March",

                       "April", "May", "June",

                       "July", "August", "September",

                       "October", "November", "December"

                      };

 

    return (months[monthNumber]);

}

 

/* A Function to return the number of days in

   a month

 

  Month Number     Name        Number of Days

  0                January     31

  1                February    28 (non-leap) / 29 (leap)

  2                March       31

  3                April       30

  4                May         31

  5                June        30

  6                July        31

  7                August      31

  8                September   30

  9                October     31

  10               November    30

  11               December    31

 

*/

int numberOfDays (int monthNumber, int year)

{

    // January

    if (monthNumber == 0)

        return (31);

 

    // February

    if (monthNumber == 1)

    {

        // If the year is leap then February 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);

}

 

// Function to print the calendar of the given year

void printCalendar(int year)

{

    printf ("         Calendar - %d\n\n", year);

    int days;

 

    // Index of the day from 0 to 6

    int current = dayNumber (1, 1, year);

 

    // i --> Iterate through all the months

    // j --> Iterate through all the days of the

    //       month - i

    for (int i = 0; i < 12; i++)

    {

        days = numberOfDays (i, year);

 

        // Print the current month name

        printf("\n  ------------%s-------------\n",

               getMonthName (i).c_str());

 

        // Print the columns

        printf("  Sun  Mon  Tue  Wed  Thu  Fri  Sat\n");

 

        // Print appropriate spaces

        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;

}

 

// Driver Program to check above funtions

int main()

{

    int year = 2016;

    printCalendar(year);

 

    return (0);

}

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