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question:This question requires you to find the sum of all the even numbers from 1 to n (inclusive) using recursion. If n is 6, then the sum will be 2 + 4 + 6 = 12 Example: Input: n = 6 Output: 12 Input: n = 1 Output: 0 Input: n = 10 Output: 30 Here are the details: 1. The function should be named `sum_even_numbers`. 2. The function should take one argument `n`. 3. The function should return the sum of all even numbers from 1 to n (inclusive). 4. You should use recursion to solve this problem. To solve this, I have written the following code, but it does not work correctly. ```python def sum_even_numbers(n): if n <= 0: return 0 elif n % 2 == 0: return n + sum_even_numbers(n-1) else: sum_even_numbers(n-1) ``` # Test Cases print(sum_even_numbers(6)) # Expected Output: 12 print(sum_even_numbers(1)) # Expected Output: 0 print(sum_even_numbers(10)) # Expected Output: 30 ``` My code does not return values when the input number is odd. This is likely because the function does not return anything when n is odd, it just calls itself recursively without returning the result. How do I fix this?

answer:def sum_even_numbers(n): if n <= 0: return 0 elif n % 2 == 0: return n + sum_even_numbers(n-2) else: return sum_even_numbers(n-1)

question:# Python program to create a simple calculator ```python class Calculator: def __init__(self): pass def add(self, a, b): return a + b def subtract(self, a, b): return a - b def multiply(self, a, b): return a * b def divide(self, a, b): if b == 0: return "Error: Division by zero is not allowed" return a / b ``` Now I want to add another operation, i.e., exponentiation. How can I do that?

answer:class Calculator: def __init__(self): pass def add(self, a, b): return a + b def subtract(self, a, b): return a - b def multiply(self, a, b): return a * b def divide(self, a, b): if b == 0: return "Error: Division by zero is not allowed" return a / b def exponentiation(self, a, b): return a ** b

question:# Whiteboard Question: Reverse Linked List Given the head of a singly linked list, reverse the linked list. Example: - Input: `head = [1,2,3,4,5]` - Output: `[5,4,3,2,1]` # Constraints: - The number of nodes in the list is in the range `[0, 5000]`. - `-5000 <= Node.val <= 5000`

answer:class ListNode: def __init__(self, val=0, next=None): self.val = val self.next = next def reverseList(head: ListNode) -> ListNode: Reverses a singly linked list. prev = None current = head while current is not None: next_node = current.next current.next = prev prev = current current = next_node return prev

question:# How do I make a code that converts input temperature from Fahrenheit to Celsius or Celsius to Fahrenheit?

answer:def convert_temperature(value, scale): Convert temperature between Fahrenheit and Celsius. :param value: The numerical value of the temperature to convert. :param scale: The scale to convert the temperature to ("C" for Celsius, "F" for Fahrenheit). :return: The converted temperature value. if scale == "C": return (value - 32) * 5/9 elif scale == "F": return value * 9/5 + 32 else: raise ValueError("Scale must be 'C' for Celsius or 'F' for Fahrenheit.")