Processing Beginner Code

/** Project 1:  My Bouncing Ball
  * @Author: Allen Thoe
  * @Date: 1/21/2020
  */
//DECLARE VARIABLES-->  Type name;
float x, y, d;
float Vx, Vy;

void setup(){
  size(600,600);
  strokeWeight(4);
  x = 200;
  Vx = random(-5,5);
  Vy = random(-5,5);
  y = 300;
  d = 60;
  textSize(40);
}

void draw(){
  background(r,g,b);
  fill(0,195, 255);
  stroke(155, 0, 255);
  ellipse(x, y, d, d);
  moveBall();  //CALL the moveBall() function
  bounce();
}

//Function MoveBall will update the location of the ball
void moveBall(){
  x = x + Vx;
  y = y + Vy;
}

void bounce(){
  //HITS LEFT OR RIGHT WALL
  if(x < 0 || x > width){
    Vx = -Vx;
    //r = random(255);
    //g = random(255);
    //b = random(255);
  }
  //HITS UP OR DOWN WALL
  if(y < 0 || y > height){
    Vy = -Vy;
  }
}