diff --git a/calculator/main.py b/calculator/main.py
index 43bf23b..c88ab2e 100644
--- a/calculator/main.py
+++ b/calculator/main.py
@@ -2,21 +2,23 @@
 # Performs basic arithmetic operations based on user input
 
 def add(a, b):
-    # TODO: Return sum of a and b
-    pass
+    # Return sum of a and b
+    return a + b
 
 def subtract(a, b):
-    # TODO: Return difference of a and b
-    pass
+    # Return difference of a and b
+    return a - b
 
 def multiply(a, b):
-    # TODO: Return product of a and b
-    pass
+    # Return product of a and b
+    return a * b
 
 def divide(a, b):
-    # TODO: Return quotient of a and b
+    # Return quotient of a and b
     # Handle division by zero
-    pass
+    if b == 0:
+        return "Error: Division by zero!"
+    return a / b
 
 def main():
     print("Simple Calculator")
@@ -27,7 +29,18 @@ def main():
         operator = input("Enter operator: ")
         num2 = float(input("Enter second number: "))
 
-        # Match the operator with the correct function
+        if operator == '+':
+            result = add(num1, num2)
+        elif operator == '-':
+            result = subtract(num1, num2)
+        elif operator == '*':
+            result = multiply(num1, num2)
+        elif operator == '/':
+            result = divide(num1, num2)
+        else:
+            result = "Invalid operator!"
+
+        print("Result:", result)
 
     except ValueError:
         print("Invalid number entered.")
diff --git a/convert-distance/main.py b/convert-distance/main.py
index f6bcfe8..b663b14 100644
--- a/convert-distance/main.py
+++ b/convert-distance/main.py
@@ -3,14 +3,17 @@
 
 def km_to_m(km):
     # TODO: Convert kilometers to meters
+    return (km*1000)
     pass
 
 def m_to_cm(m):
     # TODO: Convert meters to centimeters
+    return (m*100)
     pass
 
 def cm_to_km(cm):
     # TODO: Convert centimeters to kilometers
+    return (cm/100000)
     pass
 
 def main():
@@ -24,15 +27,18 @@ def main():
 
     if choice == "1":
         km = float(input("Enter distance in kilometers: "))
+        result = km_to_m(km)
         # Call conversion function
     elif choice == "2":
         m = float(input("Enter distance in meters: "))
+        result = m_to_cm(m)
         # Call conversion function
     elif choice == "3":
         cm = float(input("Enter distance in centimeters: "))
+        result = cm_to_km(cm)
         # Call conversion function
     else:
         print("Invalid choice!")
-
+    print("Result:",result)
 if __name__ == "__main__":
     main()
diff --git a/digital-clock/main.py b/digital-clock/main.py
index 986773e..14b5ebb 100644
--- a/digital-clock/main.py
+++ b/digital-clock/main.py
@@ -6,6 +6,8 @@
 
 def get_current_time():
     # TODO: Return the current system time in formatted string
+    print (datetime.now())
+    
     pass
 
 def main():
@@ -14,6 +16,8 @@ def main():
     try:
         while True:
             # Get current time and display it
+            get_current_time()
+            time.sleep(1)
             # Use time.sleep(1) to update every second
             pass
     except KeyboardInterrupt:
diff --git a/pick-color/main.py b/pick-color/main.py
index 4286499..0a2c51b 100644
--- a/pick-color/main.py
+++ b/pick-color/main.py
@@ -1,11 +1,12 @@
 # Color Picker Simulator
 # Picks a random color from a predefined list
 
-import random
+from random import randrange
 
 def get_random_color():
     # TODO: Return a random color from the list
     colors = ["Red", "Green", "Blue", "Yellow", "Purple", "Orange"]
+    print(colors[randrange(5)])
     pass
 
 def main():
@@ -14,6 +15,6 @@ def main():
     while True:
         input("Press Enter to pick a color (or Ctrl+C to quit)...")
         # Call the random color function and display the result
-
+        print(get_random_color())
 if __name__ == "__main__":
     main()
diff --git a/to-do/main.py b/to-do/main.py
index a1fcc80..b6b158e 100644
--- a/to-do/main.py
+++ b/to-do/main.py
@@ -9,14 +9,18 @@ def show_menu():
     print("4. Exit")
 
 def add_task(tasks):
+    task = input("Enter a task")
+    tasks.append(task)
     # TODO: Ask user for a task and append to the list
     pass
 
 def remove_task(tasks):
+    tasks.pop()
     # TODO: Show task list and allow user to remove by index
     pass
 
 def view_tasks(tasks):
+    print(tasks)
     # TODO: Display current list of tasks
     pass