/**
 * Conditionals 1. 
 * 
 * Conditions are like questions. 
 * They allow a program to decide to take one action if 
 * the answer to a question is "true" or to do another action
 * if the answer to the question is "false."<br /> 
 * The questions asked within a program are always logical
 * or relational statements. For example, if the variable 'i' is 
 * equal to zero then draw a line. 
 */
 
size(640, 360);
background(0);

for(int i = 10; i < width; i += 10) {
  // If 'i' divides by 20 with no remainder draw 
  // the first line, else draw the second line
  if((i % 20) == 0) {
    stroke(255);
    line(i, 80, i, height/2);
  } else {
    stroke(153);
    line(i, 20, i, 180); 
  }
}