// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 6-7: Local variables
  
  void setup() {
    size(200,200);
    // x is not available! It is local to the draw() block of code.
  }
  
  void draw() {
    background(0);
    int x = 0;
    // x is available! Since it is declared within the draw() block of code, it is available here. 
    // Notice, however, that it is not available inside draw() above where it is declared. 
    // Also, it is available inside the while block of code because while is inside of draw().
    while (x < width) {
      stroke(255);
      line(x,0,x,height);
      x += 5;
    }
  }
  
  void mousePressed() {
    // x is not available! It is local to the draw( ) block of code.
    println( " The mouse was pressed! " );
  }