createCanvas(400, 400);

  let num = 840000;

  let n = 2

  let d = null;

  let ree = null;

  if (num < 1) {

    d = floor(round(log(num))/2)+1

    ree = round((num/pow(10, d))*10000)/10000

  } else {

    d = floor(round(log(num))/2)-n

    ree = round((num/pow(10, d))*10000)/10000

  }

  console.log(ree + "E" + d)

}

​

function draw() {

  background(220);

}