Calendar-using-C-programming-language

C Language Calendar

This C language project provides a basic calendar functionality, allowing users to input a date (day, month, and year) and view the corresponding month's calendar with the specified date highlighted.

Features

• Leap Year Calculation: Accurately determines if a given year is a leap year, ensuring correct calendar display.
• Day Calculation: Calculates the day of the week for any given date, enabling proper calendar formatting.
• Calendar Display: Prints the calendar for the specified month and year, marking the input date with an asterisk (*).

Functions

• isLeapYear(int year): Checks if a year is a leap year.
• leapYears(int year): Calculates the number of leap years up to a given year.
• todayOf(int y, int m, int d): Determines the day number (1-365 or 1-366) within a year for a specific date.
• days(int y, int m, int d): Calculates the total number of days from the beginning of the calendar era to the specified date.
• calendar(int date, int y, int m): Displays the calendar for the given month and year, highlighting the input date.

Usage

1. Compile: Compile the C code using a C compiler (e.g., GCC).
2. Run: Execute the compiled program.
3. Input: Enter the desired date (day, month, and year) when prompted.
4. Output: The program will display the calendar for the specified month, with the input date marked.

Example

Enter Date: 15
Enter Month: 9
Enter Year: 2024

         Sep 2024
 S  M  T  W  T  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 

Notes

• This code uses the deprecated conio.h header and clrscr() function, which may not be available on all systems. Consider replacing it with platform-independent alternatives for clearing the screen.
• Error handling for invalid input dates is not implemented. You may want to add input validation to improve robustness.
• The code assumes the Gregorian calendar.

Contributing

Feel free to fork this repository and contribute improvements or additional features.