diff --git a/FunProjects/todoApp.py b/FunProjects/todoApp.py
index 3feba70..407608b 100644
--- a/FunProjects/todoApp.py
+++ b/FunProjects/todoApp.py
@@ -7,12 +7,19 @@ def add_task(self, task):
         print(f"Task '{task}' added.")
 
     def remove_task(self, task):
-        self.tasks.remove(task)
-        print(f"Task '{task}' removed.")
+        if task in self.tasks:
+            self.tasks.remove(task)
+            print(f"Task '{task}' removed.")
+        else:
+            print(f"task'{task}'not found in the list")
 
     def display_tasks(self):
-        for task in self.tasks:
-            print(f"- {task}")
+        if self.tasks:
+            print("your task:")
+            for task in self.tasks:
+                print(f"- {task}")
+        else:
+            print("no task in the list")
 
  
 todo = TodoList()
diff --git a/problems/easy/easy_q1.py b/problems/easy/easy_q1.py
index a48fece..d8c229c 100644
--- a/problems/easy/easy_q1.py
+++ b/problems/easy/easy_q1.py
@@ -3,8 +3,16 @@
 num = int(input("Enter a number: "))
  
  
+if (num % 2) != 0:
+   print("{0} is Odd".format(num))
+else:
+ 
+ 
 if (num % 2) == 0:
+ 
+ 
    print("{0} is Even".format(num))
 else:
    print("{0} is Odd".format(num))
-  
\ No newline at end of file
+ 
+ 
\ No newline at end of file
diff --git a/problems/easy/easy_q10.py b/problems/easy/easy_q10.py
index 3ad440b..b052934 100644
--- a/problems/easy/easy_q10.py
+++ b/problems/easy/easy_q10.py
@@ -3,10 +3,29 @@ def is_palindrome(num):
     original = num
  
     reverse = 0
+ 
+    while True:
+        reverse = reverse * 10 + num % 10
+        num //= 10
+        if num == 0:
+            break
+    return reverse == original
+
+ 
+ 
+    while True:
+        reverse = reverse * 10 + num % 10
+        num //= 10
+        if num != 0:
+            break 
+ 
     while num != 0:
         reverse = reverse * 10 + num % 10
         num //= 10
+ 
+ 
     
+ 
     return reverse == original
  
     reverse = ''
@@ -18,9 +37,13 @@ def is_palindrome(num):
     else:
         return "It is not a Palindrome"
  
+ 
 if __name__ == "__main__":
     nums = int(input("Enter the Number: "))
     res = is_palindrome(nums)
     print(res)
-    
-    
+
+
+
+
+
diff --git a/problems/easy/easy_q11.py b/problems/easy/easy_q11.py
index 182540b..86d704f 100644
--- a/problems/easy/easy_q11.py
+++ b/problems/easy/easy_q11.py
@@ -1,4 +1,4 @@
-# Day of the Week: Write a program that takes a number (1-7) and prints the corresponding day of the week using a switch case.
+#
 def day_of_week(day):
     switch = {
         1: "Monday",
@@ -9,6 +9,26 @@ def day_of_week(day):
         6: "Saturday",
         7: "Sunday"
     }
+ 
+    if day <=7 :
+        return switch[8]
+    else:
+        print("Error occured")   
+if __name__ == "__main__":
+    day = int(input("Enter a number (1-7) to get the day of the week: "))
+    result = day_of_week(day)
+    print(result)
+ 
+ 
+    if day < 1 or day > 7:
+        return "Invalid day"
+    return switch[day]
+if __name__ == "__main__":
+    xcd = day_of_week(32)
+    print(xcd)
+
+    
+ 
     return switch[day]   
 if __name__ == "__main__":
  
@@ -25,5 +45,4 @@ def day_of_week(day):
         print(xcd)
     else:
         print("Enter Valid Input")
- 
-    
+ 
\ No newline at end of file
diff --git a/problems/easy/easy_q12.py b/problems/easy/easy_q12.py
index 1a02b99..c762cae 100644
--- a/problems/easy/easy_q12.py
+++ b/problems/easy/easy_q12.py
@@ -13,7 +13,11 @@ def calculator(a, b, operator):
     n2 = int(input("Enter the Number 2 :"))
     opr  = input("Enter the Operator :")
     result = calculator(n1,n2,opr)
+ 
+    print(result)
+ 
      print(result)
+ 
     
      print(result)
  
\ No newline at end of file
diff --git a/problems/easy/easy_q13.py b/problems/easy/easy_q13.py
index 24e98a6..90d0a0c 100644
--- a/problems/easy/easy_q13.py
+++ b/problems/easy/easy_q13.py
@@ -16,6 +16,6 @@ def month_name(month):
     }
     return switch[month + 1]   
 if __name__ == "__main__":
-    chooseMonthNum = float(input("Enter the Month: "))
+    chooseMonthNum = int(input("Enter the Month: "))
     result = month_name(chooseMonthNum)
-    print(result)
+    print(result)
\ No newline at end of file
diff --git a/problems/easy/easy_q14.py b/problems/easy/easy_q14.py
index eae63b0..10153a9 100644
--- a/problems/easy/easy_q14.py
+++ b/problems/easy/easy_q14.py
@@ -7,8 +7,11 @@ def vowel_or_consonant(char):
         'o': "Vowel",
         'u': "Vowel",
     }
-    return switch.get(char, "Vowel")   
+    return switch.get(char.lower(),"Constant")   
 if __name__ == "__main__":
-    characterInput  = int(input("Enter the charactrer : "))
-    res = vowel_or_consonant(characterInput)
-    print(res)
+    characterInput  = input("Enter the charactrer : ")
+    if len(characterInput)==1:
+      res = vowel_or_consonant(characterInput)
+      print(res)
+    else:
+       print("Please enter exactly one character.")
\ No newline at end of file
diff --git a/problems/easy/easy_q15.py b/problems/easy/easy_q15.py
index 2868314..c13c8bf 100644
--- a/problems/easy/easy_q15.py
+++ b/problems/easy/easy_q15.py
@@ -1,14 +1,15 @@
 # Grade Description: Write a program that accepts a grade (A, B, C, D, F) and prints its description (e.g., A = Excellent, B = Good, etc.) using a switch case.
 def grade_description(grade):
     switch = {
-        'A': "Good",
-        'B': "Average",
-        'C': "Poor",
-        'D': "Excellent",  
+        'A': "Excellent",
+        'B': "Good",
+        'C': "Average",
+        'D': "Poor",  
         'F': "Fail"
     }
-    return switch.get(grade, "Not a valid grade") 
+    return switch.get(grade.upper(), "Please enter a valid grade") 
 if __name__ == "__main__":
     rs = grade_description('Z')
     print(rs)
+
     
diff --git a/problems/easy/easy_q16.py b/problems/easy/easy_q16.py
index b810a85..16b00c5 100644
--- a/problems/easy/easy_q16.py
+++ b/problems/easy/easy_q16.py
@@ -1,6 +1,15 @@
 # Print the Sum of First and Last Array Element
 def sum_first_last(arr):
-    return arr[1] + arr[-1]  
+    return arr[0] + arr[-1]  
 if __name__ == "__main__":
     # Handle the input  by Yourself
-    sum_first_last()
\ No newline at end of file
+ 
+    arr=[]
+    n=int(input("Enter the Total number of Elements:"))
+    for i in range(n):
+        x=int(input("Enter the element :"))
+        arr.append(x)
+ 
+    arr=[2,5,8,7,6]
+ 
+    print(sum_first_last(arr))
\ No newline at end of file
diff --git a/problems/easy/easy_q17.py b/problems/easy/easy_q17.py
index 7a5356c..ac3dffa 100644
--- a/problems/easy/easy_q17.py
+++ b/problems/easy/easy_q17.py
@@ -1,7 +1,13 @@
 # Print X N Times
-def print_x_n_times(x, n):
-    for i in range(1, n):  # Bug: Loop runs one less time than expected
-        print(x)
+def print_x_n_times(x, n):  # Bug: Loop runs one less time than expected
+        print(x*n)
 if __name__ == "__main__":
  # Handle the input  by Yourself
- print_x_n_times()
\ No newline at end of file
+ 
+ n=int(input("Enter the number of times:"))
+ x="X"
+ 
+ x=input("Enter a character:")
+ n=int(input("enter the number of times to loop:"))
+ 
+ print_x_n_times(x,n)
\ No newline at end of file
diff --git a/problems/easy/easy_q18.py b/problems/easy/easy_q18.py
index abfc1ea..ba8b693 100644
--- a/problems/easy/easy_q18.py
+++ b/problems/easy/easy_q18.py
@@ -1,6 +1,12 @@
 # Print Last Character of String
 def last_char_of_string(s):
-    return s[-2]  # Bug: Fetches second-to-last character instead of last
+    return s[-1]  # Bug: Fetches second-to-last character instead of last
 if __name__ == "__main__":
  # Handle the input  by Yourself
- last_char_of_string()
\ No newline at end of file
+ 
+ s=input("Enter the string:")
+ print(last_char_of_string(s))
+ 
+     s=[7,8,9,6]
+     print( last_char_of_string(s))
+ 
diff --git a/problems/easy/easy_q2.py b/problems/easy/easy_q2.py
index ff47888..15ff2ec 100644
--- a/problems/easy/easy_q2.py
+++ b/problems/easy/easy_q2.py
@@ -3,16 +3,37 @@ def largest_of_two(a, b):
     if a > b:
  
  
+        return a  
+ 
+ 
         return a   
+ 
     else:
         return b
+if __name__=="__main__":
+    a = int(input("Enter the First Number :"))
+    b = int(input("Enter the Second Number :"))
+    res = largest_of_two(a,b)
+    print(res)
+ 
+ 
+        return a
+ 
+         return b
+  
+        return a   
+     else:
+        return b
+ 
+ 
+ 
 if __name__ == "__main__":
     num1 = int(input("Enter the First Number :"))
-    num2 = int(input("Enter the Second Number :"))
+    num2 = int(input("Enter the Second  :"))
     res = largest_of_two(num1,num2)
+    print(res)
+ 
+ 
  
  
-        print(num1,"larger")
-    else:
-        print(num2,"larger")
  
\ No newline at end of file
diff --git a/problems/easy/easy_q3.py b/problems/easy/easy_q3.py
index ef1d387..dda11f9 100644
--- a/problems/easy/easy_q3.py
+++ b/problems/easy/easy_q3.py
@@ -2,24 +2,15 @@
 def is_leap_year(year):
  
  
-    if year % 4 == 0:
-       if year % 100 == 0:
-           return "Not a Leap Year"
-       if year % 400 == 0:
-            return "Leap Year" 
-       return "Leap Year"
- 
-    if year % 4 == 0 and year % 100 != 0 or year % 400 == 0:   
- 
+    if year % 4 != 0 and year % 100 == 0 or year % 400 != 0:   
+        return "Not a Leap Year"   
+    else:
+        return "Leap Year"
  
-        return "Leap Year"   
-    return "Not a Leap Year"
  
-        return " Leap Year"   
+    if year % 4 == 0 or year % 100 == 0 or year % 400 == 0:   
+        return "Leap Year"
     else:
-        return "not a Leap Year"
- 
+         return "Not a Leap Year"
  
-        return "Leap Year"   
-    return "Not a Leap Year"
- 
\ No newline at end of file
+  
\ No newline at end of file
diff --git a/problems/easy/easy_q4.py b/problems/easy/easy_q4.py
index b99ff2e..3ebca2a 100644
--- a/problems/easy/easy_q4.py
+++ b/problems/easy/easy_q4.py
@@ -4,19 +4,18 @@
  
 def check_number(num):
  
-    if num < 0:
-        print("Negative")  
-    elif num > 0:
-        print("Positive")  
-    else:
- 
-        print("Number is Zero")   
  
+    print("The given number is Negative" if (num  < 0 ) else  "The given number is Positive" if (num > 0) else "The given number is Zero")
 if __name__ == "__main__":
     num = int(input("Enter the Number : "))
     check_number(num)
  
+ 
+    if num > 0:
+        print("positive")  
+    elif num < 0:
+        print("negative")  
+    else:
         print("Number is zero")   
  
-    
-    
+ 
diff --git a/problems/easy/easy_q5.py b/problems/easy/easy_q5.py
index 7ada51f..2439bfb 100644
--- a/problems/easy/easy_q5.py
+++ b/problems/easy/easy_q5.py
@@ -1,6 +1,19 @@
-# Grading System: Write a program that takes a student’s marks as input and prints the grade (A, B, C, or F) based on given thresholds.
-
 def grade_system(marks):
+ 
+    if marks >=90 and marks <=100:
+        return "A"  
+    elif marks >= 80 and marks <=90:
+        return "B"   
+    elif marks >= 70 and marks <=80:
+        return "C"   
+    else:
+        return "D"  
+    
+if __name__ == "__main__":
+    num = int(input("Enter the Mark : "))
+    res = grade_system(num)
+    print(res)
+ 
     if marks >= 90:
         return "A"  
     elif marks >= 80:
@@ -9,7 +22,15 @@ def grade_system(marks):
         return "C"   
     else:
  
+ 
         return "F"  
+ 
+ 
+        return "D"  
+ 
+        return "F"  
+ 
+ 
     
 if __name__ == "__main__":
       mark = int(input("Enter the Mark : "))
@@ -22,4 +43,4 @@ def grade_system(marks):
 if __name__ == "__main__":
       num = int(input("Enter the Mark : "))
       res = grade_system(num)
- 
\ No newline at end of file
+ 
diff --git a/problems/easy/easy_q6.py b/problems/easy/easy_q6.py
index cc53209..c24e85d 100644
--- a/problems/easy/easy_q6.py
+++ b/problems/easy/easy_q6.py
@@ -4,11 +4,10 @@ def print_numbers(n):
     while i <= n:
         print(i)
  
-if __name__ == "__main__":
-     num = int(input("Enter the Number "))
-    print_numbers(num)
-    
  
-    num = int(input("Enter the Number :"))
+        i += 1   
+
+if __name__ == "__main__":
+    num = int(input("Enter the Number "))
     print_numbers(num)
- 
+ 
\ No newline at end of file
diff --git a/problems/easy/easy_q7.py b/problems/easy/easy_q7.py
index eccd1cd..0a56164 100644
--- a/problems/easy/easy_q7.py
+++ b/problems/easy/easy_q7.py
@@ -1,26 +1,25 @@
-# Sum of Digits: Write a program to calculate the sum of digits of a number using a while loop.
-def  sum_of_digits(num):
-    total = 0
-    while num > 0:
-        total += num % 10
- 
-        num = num // 10  
- 
- 
-        num = num // 10  
  
-        num //= 10  
+def sum_of_digits(num):
  
+    total = 0
+    while num > 0:
  
+        total += num % 10  
+        num //= 10         
     return total
 
 if __name__ == "__main__":
-    num = int(input("Enter the Number : "))
- 
-    res=sum_of_digits(num)
-    print(res)
+    num = int(input("Enter the Number: "))
+    if num < 0:  
+        num = -num
+    result = sum_of_digits(num)
+    print(f"Sum of digits: {result}")
+
  
-    
+        total += num % 10
+         num = num//10  
  
-    
+  
  
+    return total
+ 
\ No newline at end of file
diff --git a/problems/easy/easy_q8.py b/problems/easy/easy_q8.py
index 526f5ab..9f8aa51 100644
--- a/problems/easy/easy_q8.py
+++ b/problems/easy/easy_q8.py
@@ -1,13 +1,28 @@
  # Reverse a Number: Accept a number and print its reverse using a while loop.
 def reverse_number(num):
+ 
+    rev = ""
+    while num != 0:
+        digit = num % 10    #digit = 123%10 = 3  12%10
+        rev = rev + str(digit)   #rev = 3
+        num //= 10      # num//= 10 = 12
+    return rev   
+ 
     rev = ''
     while num != 0:
         digit = num % 10
+ 
+        rev = rev*10+ digit   
+        num //= 10
+    return rev 
+ 
         rev = rev + str(digit)   
         num //= 10
     return int(rev)   
+ 
+ 
 if __name__ == "__main__":
-    num = int(input("Enter num : "))
+    num = int(input("Enter num : "))    #123
     res = reverse_number(num)
     print(res)
 
diff --git a/problems/easy/easy_q9.py b/problems/easy/easy_q9.py
index df9a503..2c82f2e 100644
--- a/problems/easy/easy_q9.py
+++ b/problems/easy/easy_q9.py
@@ -1,16 +1,32 @@
 # Factorial of a Number: Write a program to calculate the factorial of a given number using a while loop.
 def factorial(n):
     result = 1
+ 
+    i=1
+    while i <= n:
+        result *= i
+        i += 1   
+ 
     while n > 0:
         result *= n
         n -= 1   
+ 
     return result
 
 if __name__ == "__main__":
+ 
+    n= int(input("Enter the Number :"))
+    print(factorial(n))
+
+ 
     num = int(input("Enter the Number :"))
  
     print(factorial(num))
-    
+ 
+ 
+    print(factorial(num))
+ 
+ 
      res=factorial(num)
     print(res)
      
diff --git a/problems/medium/m1.py b/problems/medium/m1.py
index 99456d9..03d0867 100644
--- a/problems/medium/m1.py
+++ b/problems/medium/m1.py
@@ -1,8 +1,32 @@
-'''
-Create a menu to perform basic mathematical operations (addition, subtraction, multiplication, division, modulo) on two numbers.
-
-'''
 def math_operations_menu(choice):
+ 
+    try:
+        a, b = map(int, input("Enter two numbers (separated by a comma): ").split(sep=","))
+        
+        # Perform the operation based on user's choice
+        if choice == 1:
+            print(f"Addition of {a} and {b}: {a + b}")   
+        elif choice == 2:
+            print(f"Subtraction of {a} and {b}: {a - b}")   
+        elif choice == 3:
+            print(f"Multiplication of {a} and {b}: {a * b}")   
+        elif choice == 4:
+            if b == 0:
+                print("Error! Division by zero is not allowed.")
+            else:
+                print(f"Division of {a} and {b}: {a / b}")   
+        elif choice == 5:
+            if b == 0:
+                print("Error! Modulo by zero is not allowed.")
+            else:
+                print(f"Modulus of {a} and {b}: {a % b}")   
+        elif choice == 6:
+            print(f"{a} to the power of {b}: {a ** b}")
+        else:
+            print("Invalid option!!!")
+    except ValueError:
+        print("Invalid input! Please enter two valid numbers separated by a comma.")
+ 
     a, b = map(int, input("Enter two numbers(separated by commas): ").split(sep=","))
 
  
@@ -25,4 +49,5 @@ def math_operations_menu(choice):
         print("Invalid option")
  
 math_operations_menu()
-  
\ No newline at end of file
+  
+ 
diff --git a/problems/medium/m10.py b/problems/medium/m10.py
index 89f6b41..8cfcd14 100644
--- a/problems/medium/m10.py
+++ b/problems/medium/m10.py
@@ -2,7 +2,7 @@
 
 def game_menu():
     while True:
-        print("\n1. Number Guessing Game")
+        print("1. Number Guessing Game")
         print("2. Rock-Paper-Scissors")
         print("3. Dice Roll Simulation")
         print("4. Exit")
@@ -11,7 +11,11 @@ def game_menu():
         if choice == 1:
             target = random.randint(1, 100)
             guess = int(input("Guess a number between 1 and 100: "))
+ 
+            if guess = target:
+ 
             if guess == target:   
+
                 print("You won!")
             else:
                 print("Try Again")
@@ -31,5 +35,16 @@ def game_menu():
             break
         else:
             print("Invalid Choice")
+ 
+game_menu()
+ 
+ 
+x=input("Can we play some games?? (type yes and no)")
+if x=="yes":
+    game_menu()
+else:
+    print("Okey , let's play later!")
+ 
 
-game_menu()
\ No newline at end of file
+game_menu()
+  
\ No newline at end of file
diff --git a/problems/medium/m11.py b/problems/medium/m11.py
index a6422c7..0429420 100644
--- a/problems/medium/m11.py
+++ b/problems/medium/m11.py
@@ -1,38 +1,51 @@
 # Menu driven program to calculate perimeter and area of different shapes
 
 def per_circle(radius):
+ 
     perimeter = 3.14 * radius   
-    print("Perimeter of Circle: ", perimeters)  
+    print("Perimeter of Circle: ", perimeter)  
 
 def per_triangle(side1, side2, side3):
-    perimeter = side1 + side3  
+    perimeter = side1 + side2 +  side3  
+ 
+    perimeter =2* 3.14 * radius   
+    print("Perimeter of Circle: ", perimeter)  
+
+def per_triangle(side1, side2, side3):
+    perimeter = side1 + side2+ side3  
+ 
     print("Perimeter of Triangle: ", perimeter)
 
 def per_rectangle(height, width):
-    perimeter = (height + width)  
-    print("Perimeter of Rectangle: ", perimeters)  
+    perimeter = 2*(height + width)  
+    print("Perimeter of Rectangle: ", perimeter)  
 
 def per_square(side):
-    perimeter = side * 3   
+    perimeter = side * 4   
     print("Perimeter of Square: ", perimeter)
 
  
 def a_circle(radius):
-    area = 3.14 * radius ** 2
-    print("Area of Circle: ", areas)   
+    area = 3.14 * (radius ** 2)
+    print("Area of Circle: ", area)   
 
 def a_triangle(base, height):
-    area = base * height 
+    area = 0.5 (base * height)
     print("Area of Triangle: ", area)
 
 def a_rectangle(height, width):
-    area = height + width   
+    area = height * width   
     print("Area of Rectangle: ", area)
 
 def a_square(side):
-    area = side * 3  
+ 
+    area = side * side  
+ 
+    area = side *2  
+ 
     print("Area of Square: ", area)
-    
+
+
 print("\nWELCOME TO MENSURATION PROGRAM! TRY CALCULATING PERIMETER AND AREA OF DIFFERENT GEOMETRIC SHAPES.")
 
  
@@ -53,10 +66,10 @@ def a_square(side):
             choice1 = int(input("\nEnter choice for calculations: "))
             if choice1 == 1:
                 radius = float(input("Enter Radius of Circle: "))   
-                per_circles(radius)   
+                per_circle(radius)   
             elif choice1 == 2:
                 radius = float(input("Enter Radius of Circle: "))
-                a_circle() 
+                a_circle(radius) 
             elif choice1 == 3:
                 break
             else:
@@ -69,13 +82,20 @@ def a_square(side):
             print("3. Exit")
             choice1 = int(input("\nEnter choice for calculations: "))
             if choice1 == 1:
+  
                 side1 = int(input("Enter length of side1: "))
                 side2 = int(input("Enter length of side2: "))
                 side3 = int(input("Enter length of side3: "))
-                per_triangle(side1, side2)  
+                per_triangle(side1, side2, side3)  
+ 
+                side1 = float(input("Enter length of side1: "))
+                side2 = float(input("Enter length of side2: "))
+                side3 = float(input("Enter length of side3: "))
+                per_triangle(side1,side2,side3)  
+ 
             elif choice1 == 2:
                 base = float(input("Enter base of triangle: "))
-                height = input("Enter height of triangle: ")  
+                height = float(input("Enter height of triangle: "))  
                 a_triangle(base, height)
             elif choice1 == 3:
                 break
@@ -89,12 +109,18 @@ def a_square(side):
             print("3. Exit")
             choice1 = int(input("\nEnter choice for calculations: "))
             if choice1 == 1:
+ 
                 height = int(input("Enter height of rectangle: "))
-                per_rectangle(height)  
+                width = int(input("Enter width of rectangle: "))
+ 
+                height = float(input("Enter height of rectangle: "))
+                width = float(input("Enter width of rectangle: "))
+ 
+                per_rectangle(height,width)  
             elif choice1 == 2:
                 height = float(input("Enter height of rectangle: "))
                 width = int(input("Enter width of rectangle: "))
-                a_rectangle(height)  
+                a_rectangle(height,width)  
             elif choice1 == 3:
                 break
             else:
@@ -107,10 +133,10 @@ def a_square(side):
             print("3. Exit")
             choice1 = int(input("\nEnter choice for calculations: "))
             if choice1 == 1:
-                side = int(input("Enter side of square: "))
+                side = float(input("Enter side of square: "))
                 per_square(side)
             elif choice1 == 2:
-                side = input("Enter side of square: ")   
+                side = int(input("Enter side of square: "))   
                 a_square(side)
             elif choice1 == 3:
                 break
diff --git a/problems/medium/m13.py b/problems/medium/m13.py
index 33dfa3f..5751959 100644
--- a/problems/medium/m13.py
+++ b/problems/medium/m13.py
@@ -9,7 +9,16 @@ def is_prime(num):
             return False
     return True
 
-n = int(input("Enter a number: "))
-for i in range(2, n + 1):
-    if is_prime(i):
-        print(i)
+while True:
+    try:
+        n = int(input("Enter a number: "))
+        break
+    except:
+        print("Enter valid a integer.")
+
+
+if is_prime(n):
+    print(f"{n} is a prime number.")
+else:
+    print(f"{n} is not a prime number.")
+    
\ No newline at end of file
diff --git a/problems/medium/m15.py b/problems/medium/m15.py
index ab58cd0..afcb2e3 100644
--- a/problems/medium/m15.py
+++ b/problems/medium/m15.py
@@ -1,30 +1,16 @@
 '''Write a program to check if a number is an Armstrong number (e.g., 153  = 1^3 + 5^3 + 3^3 ) .'''
-def count_digits(n):
-   i = 0
-   while n > 0:
-      n //= 10
-      i += 1
-   return i
+a=input("Enter Number:")
+def Arms(a):
+   e=0
+   for i in a:
+      c=int(i)
+      d=c*c*c
+      e+=d
+   return e
 
-def sum(n):
-   i = count_digits(n)
-   s = 0
-   temp=n
-   while temp > 0:
-      digit = temp%10
-      temp//= 10
-      s += pow(digit,i)
-   return s
-
-
-num = 1634
-
- 
-s = sum(num)
-
- 
-if s == num:
-   print('Given number is an Armstrong Number')
+b=Arms(a)
+f=int(a)
+if b==f:
+   print(b,"is an Armstrong Number")
 else:
-   print('Given number is not an Armstrong Number')
-
+   print(b,"is not An Armstrong Number")
\ No newline at end of file
diff --git a/problems/medium/m17.py b/problems/medium/m17.py
index e857a27..c554451 100644
--- a/problems/medium/m17.py
+++ b/problems/medium/m17.py
@@ -1,16 +1,16 @@
 '''Write a program to reverse a given list without using built-in functions'''
 def reverse_list(lst):
-    start = -1
-    end = -len(lst) 
-    
-    
-    while start > end:
-       
+ 
+    return lst[::-1]
+lst=[1,2,3,4,5]
+print(reverse_list(lst))
+ 
+    start = 0
+    end = len(lst)-1
+    while start < end:
         lst[start], lst[end] = lst[end], lst[start]
-        
-         
-        start -= 1
-        end += 1
+        start += 1
+        end -= 1
     
     return lst
  
@@ -18,4 +18,5 @@ def reverse_list(lst):
 print("Original list:", input_list)
 
 reversed_list = reverse_list(input_list)
-print("Reversed list:", reversed_list)
\ No newline at end of file
+print("Reversed list:", reversed_list)
+ 
\ No newline at end of file
diff --git a/problems/medium/m2.py b/problems/medium/m2.py
index 56d86bd..a35be12 100644
--- a/problems/medium/m2.py
+++ b/problems/medium/m2.py
@@ -3,8 +3,10 @@ def array_operations_menu():
     print("2. Largest Element")
     print("3. Smallest Element")
     print("4. Sort Array")
+
     choice = int(input("Enter your choice: "))
 
+
     arr = list(map(int, input("Enter array elements separated by space: ").split()))
 
     if choice == 1:
@@ -19,10 +21,17 @@ def array_operations_menu():
         print("Smallest Element:", min(arr))   
     elif choice == 4:
  
+ 
+        arr.sort()  # sorts the array in ascending order by default
+        print("Sorted Array:", arr) 
+    else:
+        print("Invalid option")
+ 
         print("Sorted Array:",sorted.arr) 
     else:
         print("Invalid option")
 
+ 
 array_operations_menu()
  
         arr.sort()
@@ -36,6 +45,4 @@ def array_operations_menu():
     else:
         print("Invalid option")
 array_operations_menu()
-       
- 
- 
+ 
\ No newline at end of file
diff --git a/problems/medium/m3.py b/problems/medium/m3.py
index 5d5d7b8..045664c 100644
--- a/problems/medium/m3.py
+++ b/problems/medium/m3.py
@@ -24,7 +24,12 @@ def string_manipulation_menu():
     elif choice == 4:
         old = input("Substring to replace: ")
         new = input("Replacement substring: ")
+ 
+        s = s.replace(old, new)  
+        print("Updated String:", s)   
+ 
         print("Updated String:", s.replace(old,new))   
+ 
     else:
         print("Invalid option")
 string_manipulation_menu()
\ No newline at end of file
diff --git a/problems/medium/m8.py b/problems/medium/m8.py
index 89c7cb1..c3981fc 100644
--- a/problems/medium/m8.py
+++ b/problems/medium/m8.py
@@ -9,7 +9,7 @@ def conversion_menu():
 
         if choice == 1:
             celsius = int(input("Enter temperature in Celsius: "))
-            fahrenheit = (celsius * 9 / 5) + 32   
+            fahrenheit = (celsius * 5 / 9) + 32   
             print("Temperature in Fahrenheit:", fahrenheit)
         elif choice == 2:
             fahrenheit = int(input("Enter temperature in Fahrenheit: "))
@@ -17,14 +17,19 @@ def conversion_menu():
             print("Temperature in Celsius:", celsius)
         elif choice == 3:
             decimal = int(input("Enter a decimal number: "))
-            print(f"Binary: {bin(decimal)}, Octal: {oct(decimal)}, Hexadecimal: {hex(decimal)}")   
+            print(f"Binary: {bin(decimal)}, Octal: {oct(decimal):O}, Hexadecimal: {hex(decimal):X}")   
         elif choice == 4:
-            km = float(input("Enter distance in kilometers: "))
-            miles = km * 0.621371  
-            print("Distance in Miles:", miles)
+            selection = int(input("Enter 1 for KM to Miles (or) 2 for Miles to KM : "))
+            if selection == 1:
+                km = float(input("Enter distance in kilometers: "))
+                miles = km / 0.621371  
+                print("Distance in Miles:", miles)
+            else:
+                miles = float(input("Enter distance in miles :"))
+                km = miles * 1.609
+                print("Distance in Kilometres:", km)
         elif choice == 5:
             print("Exiting...")
             break
         else:
             print("Invalid Choice")
-conversion_menu()
\ No newline at end of file