Working with C++ arrays (not C arrays).

cpsc120_array.cc

// Gist https://gist.github.com/29e77a62a20852cb0925aeb5ab840a77

#include <array>
#include <iostream>

using namespace std;

int main(int argc, char const* argv[]) {
  std::array<int, 5> even_numbers{2, 4, 6, 8, 10};

  for(int index = 0; index < even_numbers.size(); index++){
    std::cout << "The even number at " << index << " is " << even_numbers.at(index)
         << ".\n";
  }
  
  array<int, 5> odd_numbers;
  for(int index = 0, counter = 1; index < even_numbers.size(); index++, counter += 2){
    odd_numbers.at(index) = counter;
  }
  
  int index{0};
  for(int number : odd_numbers){
    std::cout << "The odd number at " << index << " is " << number << ".\n";
    index = index + 1;
  }
  
  // We can catch the error and handle it gracefully.
  try{
    cout << "The even number at " << 123456 << " is " << even_numbers.at(123456)
         << ".\n";
  }catch(std::exception const& e){
    cout << "We tried to find something outside the bounds of our array and we nearly crashed.\n";
    cout << e.what() << "\n";
  }
  // This will cause the program to fail.
  cout << "The even number at " << 123456 << " is " << even_numbers.at(123456)
       << ".\n";
  return 0;
}