look at text()

@jesse

2. int posY = 20;
3. float rand;
4. 
   
5. void setup() {
6.   size(800,800);
7.   background(0);
8. }
9. 
   
10. void draw() {
11.   posY += 20;
12.   rand = random(100);
13.   text(rand, 12, posY);
14.   println(rand);
15. }

int speed=5;
float[] rand = new float[40];

void setup() {
  size(800,800);
  background(0);
}

void draw() {
  background(0);
 
  for(int i=0; i< rand.length; i++) {
  if(rand[i]!=0)text(rand[i], 12, 20+i*20);
  }
  if(frameCount%speed==0){
    arraycopy(rand, 0, rand, 1, rand.length-1);
    rand[0] = random(100);
  }
 
}

@cedrickiefer