#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main()
{
  char grade(int score); // declare the function grade()

  vector<int> scores; // no parentheses if we want to make an empty vector
  // We could imagine reading the scores from a file and pushing them
  // into the scores vector one at a time, until the end of file is
  // reached.  For simplicity, here we'll just directly push back 3 values.
  scores.push_back(67);
  scores.push_back(93);
  scores.push_back(82);

  for (int i=0; i<scores.size(); i++) {
    int thisScore = scores[i];
    char thisGrade = grade(thisScore); // here we call function grade()
    cout << "Score " << thisScore << " is grade " << thisGrade << endl;
  }
}

// Here we define the function grade()
// The function converts a numerical score into a letter grade
char grade(int score) 
{
  if (score >= 90)
    return('A');
  else if (score >= 80)
    return('B');
  else if (score >= 70)
    return('C');
  else if (score >= 60)
    return('D');
  else
    return('F');
}