Answer and Explanation:
Sure! Here's a Python code that meets the requirements mentioned:
```python
# Define the remove function
def remove(I, n):
# Iterate through the list
for i in range(len(I)):
# Check if the element matches n
if I[i] == n:
# Remove the element by shifting all elements to the left
for j in range(i, len(I)-1):
I[j] = I[j+1]
I.pop() # Remove the last element
return True # Indicate successful removal
return False # Indicate element not found
# Define the main function
def main():
# Input the list I and the number n
I = [1, 2, 3, 4, 5]
n = 3
# Call the remove function
if remove(I, n):
print(f"Element {n} removed successfully!")
else:
print(f"Element {n} not found in the list!")
# Print the sum of the list after removal
print(f"Sum of the list after removing {n}: {sum(I)}")
# Call the main function
main()
```
Let's break down the code and explain each step:
1. We define the `remove` function that takes two parameters: the list `I` and the number `n` to be removed. This function will iterate through the list and remove the element if found. We will not use any built-in functions for removal.
2. Inside the `remove` function, we iterate through the list using a `for` loop and check if the current element matches `n`.
3. If a match is found, we remove the element by shifting all the elements to the left. We achieve this by using another `for` loop that starts from the current index and moves each element to the left.
4. After shifting all the elements, we remove the last element using the `pop` method.
5. If the element is successfully removed, we return `True` to indicate the successful removal. Otherwise, we return `False` to indicate that the element was not found in the list.
6. Next, we define the `main` function, where we can test the `remove` function and print the sum of the list after removal.
7. Inside the `main` function, we initialize the list `I` and the number `n` to be removed.
8. We call the `remove` function and check if the element was successfully removed. If so, we print a message indicating the successful removal. If not, we print a message indicating that the element was not found in the list.
9. Finally, we print the sum of the list after removing `n` using the `sum` function.
By following these steps, the code meets all the requirements mentioned and performs the necessary operations. Feel free to customize the input list `I` and the number `n` to test different scenarios.
def main():
# Sample input list
input_list = [1, 2, 3, 4, 5]
# Number to be removed
number_to_remove = 3
# Call the remove function
modified_list = remove(input_list, number_to_remove)
# Check if the number exists in the list
if modified_list == input_list:
print(f"The number {number_to_remove} doesn't exist in the list.")
else:
# Calculate the sum of the modified list
list_sum = sum(modified_list)
# Print the sum
print(f"The sum of the list after removing {number_to_remove} is: {list_sum}")
# Call the main function
main()
Explanation of the code:
The remove function takes two parameters: lst (the input list) and n (the number to be removed). It initializes an empty list, new_lst, to store the modified elements.
The function iterates over each element in the input list using a for loop.
Inside the loop, it checks if the current element is equal to the number to be removed (num != n). If it is not equal, the element is appended to the new list (new_lst.append(num)).
Once the loop completes, the function returns the modified list, new_lst.
The main function is defined to demonstrate the usage of the remove function and meet the requirements.
It initializes a sample input list, input_list, containing integers.
It sets the number_to_remove variable to the desired number that should be removed from the list.
The remove function is called, passing the input_list and number_to_remove as arguments, and the return value is stored in modified_list.
It checks if the modified_list is equal to the input_list, indicating that the number to be removed doesn't exist in the list. In this case, it prints an appropriate message.
If the modified_list is not equal to the input_list, it means the number was successfully removed. The sum of the modified list is calculated using the sum function and stored in list_sum.
Finally, the sum of the list after removing the number is printed as the output.