// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 6-6: Legs with a for loop
  
  size(200,200);
  background(255);
  
  int y = 80;       // Vertical location of each line
  int spacing = 10; // How far apart is each line
  int len = 20;     // Length of each line
  
  // Translation of the legs while loop to a for loop.
  for (int x = 50; x <= 150; x += spacing) { 
    line(x,y,x,y + len);
  }