string lenght

extrae.c

void Extrae (string lin) {
  string aux;
  int cont; // this is setup to be a counting variable
  
  aux = "";
  cont = 0;
            
  while ((lin.Substring(cont, 1) != ",") && (cont < lin.Length)) { // basically checking the lengh minus any commas
    aux = aux + lin.Substring(cont, 1); // I'm guessing the aux is new string minus any commas?
    cont++; // increase the cont var by 1, then loop.
  }
  
  valorX = double.Parse(aux); // just parsing the aux var
            
  cont++; // Ohhhhh, I see what's going on... it's taking a string like "123,82" and parsing it into x and y coordinates.
  aux = "";
            
  while (cont < lin.Length) {
    aux = aux + lin.Substring(cont, 1);
    cont++;
  }
            
  valorY = double.Parse(aux);
}