I was working on this with my partner, but he never showed up today, so I am kind of lost.

All I want to do is take this and make the smiley ball bounce up and down only. Also, I have to add 2 more balls, so I would have 3 balls bouncing up and down.

Thank you in advance for any help!

void setup() {
  size(500,500);
  frameRate(15);
  }
int posx;
int posy;
int xd = 10;
int yd = 20;
int wid =50;
int ht = 80;

void draw() {
  background(#0024FF);
  smiley(posx,posy,wid,ht);
  posx = posx + xd;
  posy = posy + yd;
  if (posx>width) {
     xd = -xd;}
  if (posy>height) {
     yd = -yd;}
  if (posx<0) {
     xd = -xd;}
  if (posy<0) {
     yd = -yd;}
}
void smiley(int x,int y,int w,int h) {
   fill(255,255,255); //white
   ellipse(x,y,w,h);
   noFill();
   arc(x,y,w/2,h/2,.25*PI,PI*.75);
   fill(0,0,0);  //black
   ellipse(x-w*.25,y-h*.25,w/10,h/10);
   ellipse(x+w*.25,y-h*.25,w/10,h/10);
}