void setup() {
  size(400, 400);
  background(255);

  drawCircle(100, 100, 50);
  drawSquare(200, 200, 80);
}

void drawCircle(float x, float y, float radius) {
  ellipse(x, y, radius * 2, radius * 2);
}

void drawSquare(float x, float y, float sideLength) {
  rect(x, y, sideLength, sideLength);
}