main.cpp

// $NAME <$ID@uakron.edu>
// University of Akron

#include <iostream>
#include <string>
#include <stdexcept> // Needed for std exceptions
#include <cstdlib>   // Needed for strtod
#include <cerrno>    // Needed for errno


// TODO: Modify this to throw exceptions.
double
read_value()
{
  std::string s;
  std::cin >> s;
  
  // Convert to double.
  char* p;
  double ret = std::strtod(s.data(), &p);

  // No conversion could be performed.
  if (p == s.data()) {
    std::runtime_error("No conversion could be performed");
    return -1;
  }

  // The input value is out of range.
  if (errno == ERANGE) {
    throw std::runtime_error("The input value is out of range");
    return -1;
  }
  return ret;
}


// TODO: Modify this to throw exceptions on invalid arguments.
double
divide(double a, double b)
{
  if (b == 0) throw std::runtime_error("Cannot divide by 0");
  return a / b;
}

int
main()
{
  // TODO: Catch exceptions, diagnose errors, and exit gracefully.
  try {
    double first = read_value();
    double second = read_value();
    double ret = divide(first, second);
    std::cout << ret << '\n';
  } catch (std::runtime_error& err) {
    std::cerr << "error: " << err.what() << '\n';
    return 1; // Indicates a program failure.
  }
  catch (...) {
    std::cerr << "unexpected error\n";
    throw;
  }

}