diff --git a/problems/easy/easy_q1.py b/problems/easy/easy_q1.py
index 759376b..ba6d728 100644
--- a/problems/easy/easy_q1.py
+++ b/problems/easy/easy_q1.py
@@ -2,15 +2,19 @@
 
 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))
  
-if (num % 2) != 0:
-   print("{0} is Odd".format(num))
-else:
-   print("{0} is Even".format(num))
+
 
    
  
+ 
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 110f086..e77c070 100644
--- a/problems/easy/easy_q2.py
+++ b/problems/easy/easy_q2.py
@@ -2,42 +2,54 @@
 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 :"))
+ 
+    res = largest_of_two(num1,num1)
+    print(res,"is the largest number")
+ 
     res = largest_of_two(num1,num2)
+ 
+    print(res)
+ 
+ 
+    print(res)
+ 
     print(res)
  
+ 
         print(num1,"larger")
     else:
+        return b
         print(num2,"larger")
     
+ 
+ 
 if __name__ == "__main__":
     num1 = int(input("Enter the First Number :"))
     num2 = int(input("Enter the Second  :"))
-    res = largest_of_two(num1,num1)
+    res = largest_of_two(num1,num2)
     print(res)
  
  
-        return a 
- 
-        return a   
- 
-    else:
-        return b
-if __name__ == "__main__":
-    num1 = int(input("Enter the First Number :"))
-    num2 = int(input("Enter the Second Number :"))
-    res = largest_of_two(num1,num2)
-  keerthi
-    print("The Largest Number is",res)
  
-    print(res)
-
-    
- main
  
  
diff --git a/problems/easy/easy_q3.py b/problems/easy/easy_q3.py
index 2a6b7cc..5210fe7 100644
--- a/problems/easy/easy_q3.py
+++ b/problems/easy/easy_q3.py
@@ -1,6 +1,18 @@
 # Leap Year or Not: Write a program to determine whether a given year is a leap year.
 def is_leap_year(year):
  
+    if year % 4 != 0 and year % 100 == 0 or year % 400 != 0:   
+        return "Not a Leap Year"   
+    else:
+        return "Leap Year"
+ 
+ 
+    if year % 4 == 0 or year % 100 == 0 or year % 400 == 0:   
+        return "Leap Year"
+    else:
+         return "Not a Leap Year"
+ 
+ 
     if year % 4 == 0:
        if year % 100 == 0:
            return "Not a Leap Year"
@@ -10,6 +22,16 @@ def is_leap_year(year):
  
     if year % 4 == 0 and year % 100 != 0 or year % 400 == 0:   
  
+        return "Leap Year" 
+    else:  
+        return "not a Leap Year"
+ 
+ 
+        return "Leap Year" 
+    else:  
+        return "Not Leap Year"
+ 
+ 
  
         return "Leap Year"   
     return "Not a Leap Year"
@@ -23,6 +45,10 @@ def is_leap_year(year):
     return "Not a Leap Year"
  
  
+ 
+ 
+ 
+ 
 if __name__ == "__main__":
     
     num = int(input("Enter the number :"))
diff --git a/problems/easy/easy_q4.py b/problems/easy/easy_q4.py
index ec24801..6fb7c41 100644
--- a/problems/easy/easy_q4.py
+++ b/problems/easy/easy_q4.py
@@ -1,5 +1,19 @@
 # Positive, Negative, or Zero: Accept a number and check if it is positive, negative, or zero.
 def check_number(num):
+ 
+    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")   
+ 
     if num < 0:
         print("Negative")  
     elif num > 0:
@@ -7,6 +21,7 @@ def check_number(num):
     else:
   keerthi
         print("Number is Zero")   
+ 
         
 if __name__ == "__main__":
     num = int(input("Enter the Number : "))
@@ -17,8 +32,10 @@ def check_number(num):
 if __name__ == "__main__":
     num = int(input("Enter the Number : "))
     res = check_number(num)
-    print(res)
- main
-    
+ 
     
+ 
+    print(res)
+  
     
+ 
diff --git a/problems/easy/easy_q5.py b/problems/easy/easy_q5.py
index 01db7d7..96fa00c 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:
@@ -8,9 +21,18 @@ def grade_system(marks):
     elif marks >= 70:
         return "C"   
     else:
+ 
+        return "F"  
+ 
+ 
+        return "D"  
+ 
         return "F"  
+ 
+ 
     
 if __name__ == "__main__":
       num = int(input("Enter the Mark : "))
       res = grade_system(num)
       print(res)
+ 
diff --git a/problems/easy/easy_q6.py b/problems/easy/easy_q6.py
index 2a3d8c5..f8d83d0 100644
--- a/problems/easy/easy_q6.py
+++ b/problems/easy/easy_q6.py
@@ -3,6 +3,27 @@ def print_numbers(n):
     i = 1
     while i <= n:
         print(i)
+ 
+        i += 1   
+
+if __name__ == "__main__":
+    num = int(input("Enter the Number "))
+    print_numbers(num)
+ 
+        i+= 1   
+
+if __name__ == "__main__":
+    n= int(input("Enter the Number "))
+    res = print_numbers(n)
+    
+ 
+ 
+        i+= 1   
+if __name__ == "__main__":
+    num = int(input("Enter the Number: "))
+    res = print_numbers(num)
+    print(res)
+ 
         i += 1   
 
 if __name__ == "__main__":
@@ -13,3 +34,6 @@ def print_numbers(n):
     num = int(input("Enter the Number :"))
     print_numbers(num)
  
+ 
+ 
+ 
diff --git a/problems/easy/easy_q7.py b/problems/easy/easy_q7.py
index 0b3053c..7f13401 100644
--- a/problems/easy/easy_q7.py
+++ b/problems/easy/easy_q7.py
@@ -1,20 +1,36 @@
-# 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 //= 10         
+    return total
+
+if __name__ == "__main__":
+    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  
+ 
  
         num = num // 10  
  
         num //= 10  
- 
+  
     return total
 
 if __name__ == "__main__":
     num = int(input("Enter the Number : "))
+     print(sum_of_digits(num))
+ 
     res=sum_of_digits(num)
     print(res)
  
     
-    
  
+  
\ 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 e5d9805..a4685d2 100644
--- a/problems/medium/m1.py
+++ b/problems/medium/m1.py
@@ -1,15 +1,69 @@
-'''
-Create a menu to perform basic mathematical operations (addition, subtraction, multiplication, division, modulo) on two numbers.
-
-'''
 def math_operations_menu(choice):
-    a, b = map(int, input("Enter two numbers(separated by commas): ").split(sep=","))
+    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.")
+
+ 
+# Menu for mathematical operations
+print("-------------Mathematical Operation Menu---------------")
+ 
+ 
+    a=int(input("Enter first numbers: "))
+    b=int(input("Enter second numbers: "))
+
+ 
+    if choice == 2:
+        print("Subtraction:", a - b)   
+    elif choice == 1:
+        print("Addition:", a + b)   
+ 
+    if choice == 1:
+ 
+        print(f"Addition of {a} and {b} : {a + b}")   
+ 
+        print("Addition:", a + b)   
+    elif choice == 2:
+        print("Subtration:", a - b)   
+    elif choice == 3:
+        print("Multiplication:", a * b)   
+    elif choice == 4:
+        print("Division:", a / b)   
+    elif choice == 5:
+        print("Modulo:", a // b)   
+    else:
+        print("Invalid option")
 
+math_operations_menu()
+ 
 
     if choice == 2:
         print("Subtraction:", a - b)   
     elif choice == 1:
         print("Addition:", a + b)   
+ 
     elif choice == 4:
         print("Division:", a / b)   
     elif choice == 3:
@@ -17,29 +71,64 @@ def math_operations_menu(choice):
  
     if choice == 1:
         print(f"Subtraction of {a} and {b}:{a - b}")   
+ 
     elif choice == 2:
-        print(f"Addition of {a} and {b}:{a + b}")   
+        print(f"Subtraction of {a} and {b} : {a - b}")   
     elif choice == 3:
-        print(f"Division of {a} and {b}:{a / b}")   
+        print(f"Division of {a} and {b} : {a / b}")   
     elif choice == 4:
+ 
+        print(f"Multiplication of {a} and {b} : {a * b}")   
+    elif choice == 5:
+        print(f"Modulus of {a} and {b} : {a % b}")   
+ 
         print(f"Multiplication of {a} and {b}:{a * b}")   
      elif choice == 5:
         print(f"Modulus of {a} and {b}:{a // b}")   
-    elif choice == 6:
-        print(f"{a} to the power of {b}:{a**b}")
+     elif choice == 6:
+        print(f"{a} to the power of {b} : {a**b}")
     else:
         print("Invalid option")
+ 
+
+math_operations_menu()
+ 
 math_operations_menu()
  
         print("Invalid option!!!")
 print("-------------Mathematical operation menu---------------")
+ 
+print("1. Subtract")
+print("2. Add")
+print("3. Multiply")
+print("4. Divide")
+print("5. Modulus")
+print("6. Exponential")
+=======
+ 
 print("1. Add")
 print("2. Subtract")
 print("3. Multiply")
 print("4. Divide")
 print("5. Modulus")
+ 
+print("6. Exponential")
+
+# Get user's choice for operation
+try:
+    choice = int(input("Enter your choice: "))
+    math_operations_menu(choice)
+except ValueError:
+    print("Invalid choice! Please enter a number between 1 and 6.")
+
+print("-------------------------------------------------------")
+ 
 print("6. Expontential")
+ 
 choice = int(input("Enter your choice: "))
 math_operations_menu(choice)
 print("-------------------------------------------------------")
- 
\ No newline at end of file
+ 
+ 
+ 
+ 
diff --git a/problems/medium/m10.py b/problems/medium/m10.py
index 89f6b41..a8046f3 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")
@@ -31,5 +31,16 @@ 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..e09e520 100644
--- a/problems/medium/m11.py
+++ b/problems/medium/m11.py
@@ -1,36 +1,36 @@
 # Menu driven program to calculate perimeter and area of different shapes
 
 def per_circle(radius):
-    perimeter = 3.14 * radius   
-    print("Perimeter of Circle: ", perimeters)  
+    perimeter =2* 3.14 * radius   
+    print("Perimeter of Circle: ", perimeter)  
 
 def per_triangle(side1, side2, side3):
-    perimeter = side1 + 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 
     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 *2  
     print("Area of Square: ", area)
     
 print("\nWELCOME TO MENSURATION PROGRAM! TRY CALCULATING PERIMETER AND AREA OF DIFFERENT GEOMETRIC SHAPES.")
@@ -53,10 +53,10 @@ 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 +69,13 @@ 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)  
+                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 +89,13 @@ 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)  
+                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 +108,10 @@ 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/m12.py b/problems/medium/m12.py
index 7692543..48b725c 100644
--- a/problems/medium/m12.py
+++ b/problems/medium/m12.py
@@ -9,8 +9,10 @@ def multiply(x, y):
     return x * y
 
 def divide(x, y):
-    return x / y
-
+    try:
+        return x / y
+    except Exception as e :
+        print(f"Error occured due to {e}") 
 while True:
     print("\nMENU")
     print("1. Add")
@@ -23,7 +25,9 @@ def divide(x, y):
 
     if choice == '5':
         break
-
+    elif choice not in "1234" :
+        print("Invalid Choice")
+        continue
     num1 = float(input("Enter first number: "))
     num2 = float(input("Enter second number: "))
 
@@ -35,8 +39,5 @@ def divide(x, y):
         result = multiply(num1, num2)
     elif choice == '4':
         result = divide(num1, num2)
-    else:
-        print("Invalid choice")
-        continue
-
+    
     print("Result: ", result)
diff --git a/problems/medium/m13.py b/problems/medium/m13.py
index 33dfa3f..ffad2e1 100644
--- a/problems/medium/m13.py
+++ b/problems/medium/m13.py
@@ -4,12 +4,15 @@
 def is_prime(num):
     if num < 2:
         return False
-    for i in range(2, num):
-        if num % i == 0:
+    n=num // 2 + 1
+    for i in range(2, n):
+        if n % i == 0:
             return False
     return True
 
 n = int(input("Enter a number: "))
-for i in range(2, n + 1):
-    if is_prime(i):
-        print(i)
+
+if is_prime(n):
+    print(f"The given number {n} is a not prime number ")
+else:
+    print(f"The given number {n} is 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 2b42991..e0f8021 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:
@@ -14,6 +16,13 @@ def array_operations_menu():
     elif choice == 3:
         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")
+array_operations_menu()
+ 
         arr.sort()
  
         print("Sorted Array:", arr) 
@@ -25,5 +34,4 @@ 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..689a6c6 100644
--- a/problems/medium/m8.py
+++ b/problems/medium/m8.py
@@ -8,23 +8,41 @@ def conversion_menu():
         choice = int(input("Enter your choice: "))
 
         if choice == 1:
+ 
+            celsius = float(input("Enter temperature in Celsius: "))
+            fahrenheit = (celsius * 9 / 5) + 32  
+ 
             celsius = int(input("Enter temperature in Celsius: "))
             fahrenheit = (celsius * 9 / 5) + 32   
+ 
             print("Temperature in Fahrenheit:", fahrenheit)
         elif choice == 2:
-            fahrenheit = int(input("Enter temperature in Fahrenheit: "))
-            celsius = (fahrenheit - 32) * 5 / 9
+            fahrenheit = float(input("Enter temperature in Fahrenheit: "))
+            celsius = (fahrenheit - 32) * 5 / 9  
             print("Temperature in Celsius:", celsius)
         elif choice == 3:
             decimal = int(input("Enter a decimal number: "))
+ 
+            print(f"Binary: {bin(decimal)[2:]}, Octal: {oct(decimal)[2:]}, Hexadecimal: {hex(decimal)[2:].upper()}")  # Correct formatting
+ 
             print(f"Binary: {bin(decimal)}, Octal: {oct(decimal)}, Hexadecimal: {hex(decimal)}")   
+ 
         elif choice == 4:
             km = float(input("Enter distance in kilometers: "))
             miles = km * 0.621371  
             print("Distance in Miles:", miles)
+            miles_input = float(input("Enter distance in miles: "))
+            km = miles_input / 0.621371  
+            print("Distance in Kilometers:", km)
         elif choice == 5:
             print("Exiting...")
             break
         else:
             print("Invalid Choice")
-conversion_menu()
\ No newline at end of file
+ 
+
+if __name__ == "__main__":
+    conversion_menu()
+ 
+conversion_menu()
+