diff --git a/TEST CASES.txt b/TEST CASES.txt
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+1.Test Cases for data_type_ops() function:
+
+Public Test Cases:
+1. **Test Case 1:**
+   - Input: 
+     - integer = 10
+     - float_num = 20.0
+     - string = "Hello"
+     - list_input = [1, 2, 3]
+     - dictionary = {"key1": "value1"}
+     - set_input = {1, 2, 3}
+     - v = 5
+   - Expected Output: 
+     - (15.0, 10.0, "HelloKaushik", [1, 2, 3, 4], {"key1": "value1", "new_key": "new_value"}, {1, 2, 3, 5})
+
+2. Test Case 2:
+   - Input:
+     - integer = 1
+     - float_num = 1.0
+     - string = "Test"
+     - list_input = []
+     - dictionary = {}
+     - set_input = set()
+     - v = 7
+   - Expected Output:
+     - (6.0, 0.5, "TestKaushik", [7], {"new_key": "new_value"}, {7})
+
+Private Test Cases:
+1.Test Case 1:
+   - Input:
+     - integer = -5
+     - float_num = 10.0
+     - string = "Data"
+     - list_input = [5, 6]
+     - dictionary = {"key2": "value2"}
+     - set_input = {8, 9}
+     - v = 3
+   - Expected Output: 
+     - (0.0, 5.0, "DataKaushik", [5, 6, 3], {"key2": "value2", "new_key": "new_value"}, {8, 9, 3})
+
+---
+
+ 2. Test Cases for num_processor() function:
+
+Public Test Cases:
+1. Test Case 1:
+   - Input: [1, 2, 3, 4, 5]
+   - Expected Output: 35 (1^2 + 3^2 + 5^2)
+
+2. Test Case 2:
+   - Input: [2, 4, 6, 8]
+   - Expected Output: 0 (No odd numbers)
+
+3. Test Case 3:
+   - Input: [1, 3, 5, 7]
+   - Expected Output: 84 (1^2 + 3^2 + 5^2 + 7^2)
+
+4. Test Case 4:
+   - Input: []
+   - Expected Output: 0 (Empty list)
+
+
+Private Test Cases:
+1. Test Case 1:
+   - Input: [10, 15, 20]
+   - Expected Output: 225 (15^2)
+
+2. Test Case 2:
+   - Input: [0, 0, 0]
+   - Expected Output: 0 (All zeros)
+
+---
+
+3. Test Cases for Vowel Counting Program:
+
+Public Test Cases:
+1. Test Case 1:
+   - Input: "hello world"
+   - Expected Output: 3 (e, o, o)
+
+2. Test Case 2:
+   - Input: ""
+   - Expected Output: 0 (Empty string)
+
+3. Test Case 3:
+   - Input: "aeiou"
+   - Expected Output: 5 (a, e, i, o, u)
+
+4. Test Case 4:
+   - Input: "bcdfg"
+   - Expected Output: 0 (No vowels)
+
+Private Test Cases:
+1. Test Case 1:
+   - Input: "Python"
+   - Expected Output: 1 (o)
+
+2. Test Case 2:
+   - Input: "Supercalifragilisticexpialidocious"
+   - Expected Output: 16 (All vowels in the string)
+
+---
+
+### 4. **Test Cases for Library Class:**
+
+#### Public Test Cases:
+1. **Test Case 1:**
+   - Action: Add a book "Python Basics" and "Data Science"
+   - Expected Output: {"Python Basics": 1, "Data Science": 1}
+
+2. **Test Case 2:**
+   - Action: Borrow "Python Basics"
+   - Expected Output: {"Python Basics": 0, "Data Science": 1}
+
+3. **Test Case 3:**
+   - Action: Try to borrow "Python Basics" again (which is unavailable)
+   - Expected Output: "Sorry, 'Python Basics' is not available."
+
+4. **Test Case 4:**
+   - Action: Return "Python Basics"
+   - Expected Output: {"Python Basics": 1, "Data Science": 1}
+
+#### Private Test Cases:
+1. **Test Case 1:**
+   - Action: Add "Machine Learning"
+   - Expected Output: {"Python Basics": 1, "Data Science": 1, "Machine Learning": 1}
+
+2. **Test Case 2:**
+   - Action: Borrow "Data Science"
+   - Expected Output: {"Python Basics": 1, "Data Science": 0, "Machine Learning": 1}
+
+3. **Test Case 3:**
+   - Action: Return "Machine Learning"
+   - Expected Output: {"Python Basics": 1, "Data Science": 0, "Machine Learning": 2}
+
+These test cases cover a variety of possible inputs and scenarios for each function and class.
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diff --git a/pythonquestions.py b/pythonquestions.py
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+'''
+Write a function data_type_ops() that takes an integer, a float, a string, a list, a dictionary, and a set as input.
+The function should perform the following operations:
+1. Add 5.0 to the integer.
+2. Divide the float by 2
+3. Concatenate the string with your name.
+4. Append  a new value  to the list.
+5. Add a new key-value pair to the dictionary with key "new_key" and value "new_value".
+6. Add a value v to the set.
+
+'''
+
+def data_type_ops(integer, floating, string, lst, dct, st, new_value, v):
+
+    updated_integer = integer + 5.0
+
+    # 2. Divide the float by 2
+    updated_float = floating / 2
+
+    # 3. Concatenate the string with your name
+    updated_string = string + " Kaushik"
+
+    # 4. Append a new value to the list
+    lst.append(new_value)
+
+    # 5. Add a new key-value pair to the dictionary
+    dct["new_key"] = "new_value"
+
+    # 6. Add a value to the set
+    st.add(v)
+
+    return updated_integer, updated_float, updated_string, lst, dct, st
+
+'''
+Write a function num_processor() that takes a list of integers and performs the following operations:
+1. Filter out all even numbers.
+2. Square the remaining odd numbers.
+3. Return the sum of the squared numbers.
+
+'''
+def num_processor(num_list):
+
+    # 1. Filter out even numbers
+    odd_numbers = filter(lambda x: x % 2 != 0, num_list)
+
+    # 2. Square the remaining odd numbers
+    squared_numbers = [x**2 for x in odd_numbers]
+
+    # 3. Return the sum of the squared numbers
+    return sum(squared_numbers)
+
+'''
+Write a program that reads a string and prints the number of vowels in it.
+'''
+def count_vowels(string):
+    """Count the number of vowels in a string."""
+    vowels = "aeiouAEIOU"
+    count = sum(1 for char in string if char in vowels)
+    return count
+
+'''
+4. LIBRARY MANAGEMENT SYSTEM
+'''
+
+class Library:
+    def __init__(self):
+        self.books = {}
+
+    def add_book(self, book):
+
+        self.books[book] = self.books.get(book, 0) + 1
+        print(f'Book "{book}" added to the library.')
+
+    def borrow_book(self, book):
+
+        if self.books.get(book, 0) > 0:
+            self.books[book] -= 1
+            print(f'You borrowed "{book}".')
+        else:
+            print(f'Sorry, "{book}" is not available.')
+
+    def return_book(self, book):
+
+        self.books[book] = self.books.get(book, 0) + 1
+        print(f'Book "{book}" returned to the library.')
+
+    def display_inventory(self):
+
+        if not self.books:
+            print("The library is empty.")
+        else:
+            print("Current inventory:")
+            for book, count in self.books.items():
+                print(f'{book}: {count} copies')
+
+def main():
+    library = Library()
+    while True:
+        print("\nLibrary Management System")
+        print("1. Add Book")
+        print("2. Borrow Book")
+        print("3. Return Book")
+        print("4. Display Inventory")
+        print("5. Exit")
+
+        choice = input("Enter your choice: ")
+
+        if choice == "1":
+            book = input("Enter the name of the book to add: ")
+            library.add_book(book)
+        elif choice == "2":
+            book = input("Enter the name of the book to borrow: ")
+            library.borrow_book(book)
+        elif choice == "3":
+            book = input("Enter the name of the book to return: ")
+            library.return_book(book)
+        elif choice == "4":
+            library.display_inventory()
+        elif choice == "5":
+            print("Exiting the Library Management System. Goodbye!")
+            break
+        else:
+            print("Invalid choice. Please try again.")
+
+if __name__ == "__main__":
+    main()
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