C++ errors

#include <iostream>
#include <vector>
#include <string>

using namespace std;

void addItem(vector<string> &list, string &text);
void removeItem(vector<string> &list, int size, int &position);
void updateItem(vector<string> &list, int size, int &item);
void showItems(vector<string> list, int size);
void printActionList();


int main()
{
	int action = 0;
	string name;
	vector<string> list;
	int list_size = list.size();
	bool running = true;
	int position = 0;

	cout << "Enter your name: ";
	cin >> name;

	cout << "Welcome " << name << "!\n";

	while (running)
	{
		string text;
		printActionList();

		cout << "Enter action: ";
		cin >> action;

		switch (action)
		{
		case 1:
			showItems(list, list_size);
			continue;
		case 2:
			cout << "Enter text: ";
			cin >> text;
			addItem(list, text);
			text = "";
		case 3:
			cout << "Enter position to remove an item: ";
			cin >> position;
			removeItem(list, list_size, position);
			position = 0;
		case 4:
			cout << "Enter position to remove an item: ";
			cin >> position;
			updateItem(list, list_size, position);
			position = 0;
		case 5:
			running = false;
		}

	}

	cout << "Goodbye " << name << "!\n";

	return 0;
}

void printActionList()
{
	cout << "------ ToDo-List manager ------\n\n";
	cout << "1. Show list\n";
	cout << "2. Add list\n";
	cout << "3. Remove list\n";
	cout << "4. Update list\n";
	cout << "5. Exit\n";
	cout << "-------------------------------\n\n";
}

void showItems(vector<string> list, int size)
{
	for (int i = 0; i < size; i++)
	{
		cout << i << ". " << list[i];
	}

	cout << '\n';
}

void addItem(vector<string> &list, string &text)
{
	list.push_back(text);
}

void removeItem(vector<string> &list, int size, int &position)
{
	list.erase(list.begin() + position);
}

void updateItem(vector<string> &list, int size, int &item)
{
	string place_text;
	for (int i = 0; i < size; i++)
	{
		if (i == item)
		{
			printf("Position: %d", i);
			cout << "Enter text: ";
			getline(cin >> ws, place_text);
			list[i] = place_text;
			break;
		}
		else
		{
			cout << "Item not found in the list";
			break;
		}
	}
}