Even or odd C++ program.

cpsc120_even_or_odd.cc

// Gist https://gist.github.com/59c6e8a6a446fa7c32b16203493d14be

#include <iostream>
#include <string>

int main(int argc, char const *argv[]) {
  if (argc < 2) {
    std::cout << "Please provide an argument.\n";
    return 1;
  }
  std::string argument{argv[1]};
  int argument_value{-1};
  try {
    argument_value = stoi(argument);
  } catch (std::exception const& e) {
    std::cout << "What you entered (" << argument << ") is not an integer.\n";
    return 1;
  }
  std::cout << "The number " << argument << " is ";
  if (argument_value % 2 == 0) {
    std::cout << "even.\n";
  } else {
    std::cout << "odd.\n";
  }
  return 0;
}