/** * Modulo.  *  * The modulo operator (%) returns the remainder of a number  * divided by another. As in this example, it is often used  * to keep numerical values within a set range.  */ int num = 20;float c;void setup(){  size(200,200);  fill(255);  frameRate(30);}void draw() {   background(0);  c+=0.1;  for(int i=1; i<height/num; i++) {     float x = (c%i)*i*i;    stroke(102);    line(0, i*num, x, i*num);    noStroke();    rect(x, i*num-num/2, 8, num);  } }