Seen this as an example but how can I make this move left to right and bounce off the sides using a function?

int w = 60;
int h = 60;
int eyeSize = 16;

void setup() {
  size(400,200);
  smooth();
}

void draw() {
  background(255);
  
  ellipseMode(CENTER);
  rectMode(CENTER);
  
  int y = height/2;
  
  // Multiple versions of Zoog
  // The variable x is now included in a for loop, in order to iterate and display multiple Zoogs!
  for (int x = 80; x < width; x += 80) { 
    
    // body
    stroke(0);
    fill(175);
    rect(x,y,w/6,h*2);
    
    // head
    fill(255);
    ellipse(x,y-h/2,w,h);
    
    // eyes
    fill(0);
    ellipse(x-w/3,y-h/2,eyeSize,eyeSize*2);
    ellipse(x+w/3,y-h/2,eyeSize,eyeSize*2);
    
    // legs
    stroke(0);
    line(x-w/12,y+h,x-w/4,y+h+10);
    line(x+w/12,y+h,x+w/4,y+h+10); 
  }
  
}