Write a function to find the index of a value in an array.

e.g.  K = { 4, 8 , 5}
   5 has index = 2 in K
   4 has index = 0 in K
   9 is not in K
int [] k = {
  4, 8, 5
};

void setup () {
  size (130, 100);
  background (255, 255, 0);
  fill (0);
  Find_Index (5, 40);
  Find_Index (4, 60);
  Find_Index (9, 80);
}
void draw () {
}
int Find_Index (int value, int pointY) {
  boolean stop = false;
  for (int i = 0; i<k.length; i++) {
    if (k[i] == value) {
      text(+value+" has index = "+i+" in K", 10, pointY);
      stop = true;
    }  
    else if (i == (k.length-1) && stop == false) {
      text (+value+ " is not in K", 30, pointY);
    }
  }
  return value;

}