//randomly assigns pairs of students
// Chris Kairalla 2007
// modified 2012
String[] students = { "Alexandra Coym", "Christina Polcari", "Edward Button", 
                      "Erika Maher",  "Jorge Brake", "Peter Terezakis", 
                      "Rafael Gross Brown", "Tarana Gupta", "Tianran Qian", 
                      "Vitor Freire", "Wyna Liu", "Yolanda Zaragoza"  };

//keeps track of whether a student has been picked.  same size as students array
boolean[] picked = new boolean[students.length];

boolean isFirstOfPair = true;

void setup(){
  //this is all text so setup isn't necessary.
}

void draw(){
  //pick a random number between 0 and amount of students
  int pick = int(random(students.length));
  //check if student has already been picked.  if not...
  if (picked[pick] == false){
    if (isFirstOfPair == true){
      print(students[pick]+ " and ");
    } 
    else {
      println(students[pick] + ".");  
    }
    isFirstOfPair = !isFirstOfPair; //switch to opposite
    picked[pick] = true; 
  }
  //see if everyone has been picked.  go thorough the picked list and see if
  //there are any "falses".
  boolean noMore = true;
  for (int i = 0; i < picked.length; i++){
    if (picked[i] == false){
      noMore = false;
    }
  }
//if there's no more students to pick then we're done. Stop looping the draw.
  if (noMore == true){
    println("all done!");
    noLoop();
  }
}