This example is for Processing 3+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, please let us know.

Conditionals 2.

We extend the language of conditionals from the previous example by adding the keyword "else". This allows conditionals to ask two or more sequential questions, each with a different action.


size(640, 360);
background(0);

for (int i = 2; i < width-2; i += 2) {
  // If 'i' divides by 20 with no remainder
  if ((i % 20) == 0) {
    stroke(255);
    line(i, 80, i, height/2);
    // If 'i' divides by 10 with no remainder
  } else if ((i % 10) == 0) {
    stroke(153);
    line(i, 20, i, 180); 
    // If neither of the above two conditions are met
    // then draw this line
  } else {  
    stroke(102);
    line(i, height/2, i, height-20);
  }
}