// The two slashes are comments (//)

// comments are ignored by the programming language

function setup() {

  createCanvas(640, 480);

}

​

//This loops over and over again

function draw() {

  background(220);

  //c = color(255,0,0)

  if (mouseIsPressed) {    

    fill(0);

    //fill (c)

  } else {

    fill(255);

  }

  ellipse(mouseX, mouseY, 80, 80);

  //rect(50, 50, 10, 10)

}