calc c++

// Example program
#include <iostream>
#include <string>

int main()
{
    int digit1;
    int digit2;
    int process;
    //information gathering process
  std::cout << "calculator proj.\n";
  std::cout << "Please enter your first number: ";
  std::cin >> digit1; //grabbing digit1 from user
  std::cout << "\n";
  std::cout << "Please enter your second number: ";
  std::cin >> digit2; //grabbing second digit
  std::cout << "\n";
  //menu 1
  std::cout << "--------------------------------";
  std::cout << "1 - Multiply\n";
    std::cout << "2 - Divide\n";
      std::cout << "3 - Add\n";
        std::cout << "4 - Subtract\n";
          std::cout << "--------------------------------";
  std::cout << "\n";
  std::cout << "Please select a process using a single digit: ";
  std::cin >> process;
  std::cout << "\n";
  if (proc)
  //calculation


}