// Example program
#include <iostream>
#include <string>
#include <thread>
#include <mutex>
#include <vector>
#include <stdlib.h>


void calculate(long long first_number, long long second_number, char &operation)
{
	if (operation == '+')
	{
		std::this_thread::sleep_for(std::chrono::seconds(1));
		std::cout << first_number + second_number << std::endl;
	}
	if (operation == '-')
	{
		std::this_thread::sleep_for(std::chrono::seconds(1));
		std::cout << first_number - second_number << std::endl;
	}
	if (operation == '*')
	{
		std::this_thread::sleep_for(std::chrono::seconds(1));
		std::cout << first_number * second_number << std::endl;
	}
	if (operation == '/')
	{
		std::this_thread::sleep_for(std::chrono::seconds(1));
		std::cout << first_number / second_number << std::endl;
	}
}

void print_menu()
{
	std::cout << "Input your expression (For example, 1+2)" << std::endl;
	std::cout << "Possible opeartions are: + - * /" << std::endl;
}



int main(){
	std::vector<std::thread> thread_vector;
	std::string user_input;
	std::vector<std::string> command;
	print_menu();
	while (1){
		std::getline(std::cin, user_input);
		if (user_input == "exit"){
			break;
		}
		char *operation = &user_input[1];
		std::string::size_type t;
		long long first_number = std::atoi(&user_input[0]);
		long long second_number = std::atoi(&user_input[2]);
		std::thread count(calculate, first_number, second_number, *operation);
		thread_vector.push_back(std::move(count));
	}
	for (int i = 0; i < thread_vector.size(); i++){
		thread_vector[i].join();
	}

}