Day Finder Program

Description

This program calculates the day of the week for a given date (day, month, year) within the range 1900 to 2099. It uses a formula based on codes assigned to months, years, and days of the week. The program considers leap years and performs necessary validations for valid input.

Features

• Input validation for:
  • Years (should be between 1900 and 2099).
  • Months (should be between 1 and 12).
  • Days (should not exceed the maximum valid days in the given month).
• Calculation of day of the week for any valid date.
• Displays an error message for invalid inputs.

How It Works

1. Input Validation:
   • Checks if the year, month, and day are within valid ranges.
   • Ensures February doesn't exceed 29 days in leap years or 28 days otherwise.
2. Day Calculation:
   • Assigns a code to the day, month, and year.
   • Computes the sum of these codes to determine the day of the week.
   • Accounts for leap years when calculating the sum.
3. Output:
   • Prints the name of the day corresponding to the calculated value.

Input Format

• The program prompts the user to enter:
  1. Day (e.g., 15)
  2. Month (e.g., 3 for March)
  3. Year (e.g., 2024)

Output Format

• For valid inputs, it displays:

  The day on given date is : [Day of the Week]
  

• For invalid inputs, it displays appropriate error messages, such as:
  • "Day name of that year can't be displayed" (for invalid years)
  • "Invalid Month" (for months not in the range 1-12)
  • "Invalid date" (for invalid day numbers)

Example

Input:

Enter day number: 15
Enter month number: 8
Enter year number: 2023

Output:

The day on given date is : Tuesday

Code Overview

• Functions and Logic:
  • The program uses modular arithmetic to assign codes to days and years.
  • A lookup table is used to assign month codes.
  • Conditional statements handle leap years and adjust calculations accordingly.
• Error Handling:
  • Input is validated for correct ranges.
  • Outputs meaningful messages for incorrect inputs.

How to Run

1. Compile the code using any C compiler (e.g., GCC):

   gcc day_finder.c -o day_finder
   

2. Run the compiled program:

   ./day_finder
   

3. Follow the prompts to input the day, month, and year.

Limitations

• Only supports years from 1900 to 2099.
• Doesn't account for historical calendar changes (e.g., Gregorian calendar adjustments).

Future Improvements

• Extend the year range beyond 1900-2099.
• Add support for historical dates and different calendar systems.
• Implement a graphical user interface (GUI) for easier interaction.

Contributing

Feel free to fork this repository and submit pull requests for improvements or additional features.