Function main

Exercises/NoModules/Chapter 08/Soln8_06.cpp:47–83

const unsigned NOT_AVAILABLE = std::numeric_limits<unsigned>::max();

int main()
{
  std::vector<unsigned> grades;

  std::cout << "Please enter a number of grades (0-100), terminated by a negative one:" << std::endl;
  while (true)
  {
    int number{};
    std::cin >> number;
    if (number < 0)
      break;
    else if (number > 100)
      std::cout << "Only numbers < 100, please..." << std::endl;
    else
      grades.push_back(number);
  }

  sort(grades);

  // Note: thruth be told, this is based on an old solution.
  // It would be better and/or easier 
  //    a) to use std::array<> instead of C-style arrays; and
  //    b) to return the values requested rather than using output parameters
  // Perhaps you can improve our solution accordingly?
  unsigned highest[5]{};
  unsigned lowest[5]{};

  getHighest(grades, highest);
  getLowest(grades, lowest);

  printNumbers("Five highest grades", highest);
  printNumbers("Five lowest grades", lowest);
  printNumber("The grade average", computeAverage(grades));
  printNumber("The median grade", computeMedian(grades));
  printNumber("The standard deviation of the grades", computeStandardDeviation(grades));
  printNumber("The variance of the grades", computeVariance(grades));
}

// Swap numbers at position first with address at position second
void swap(std::vector<unsigned>& numbers, size_t first, size_t second)