hi,
i need your help, i dont understand why this won't work.
I tried to have random-colored circles in a row, but my code
won't work with my variables r and r1.

1. float r;
   float r1;
   
   void setup() {
   float r = random(255);
   float r1 = random(50, 100);
   }
   
   void draw() {
   int i = 0;
   
   while (i <= width) {
     fill(0, r, r1, 50);
     ellipse(i, height/2, 70, 70);
     i = i + 40;
   }

If I edit fill(0, r, r1, 50);
to
  fill(0, random(255), random(50, 100), 50);

I get exactly what i want (with the exception that my ellipses are drawn new every frame). I don't understand
why my ellipses are black-colored if if use my variables r and r1.

Can you help me to understand this?
For my understanding r and r1 are set once random but this isn't the case.

Thanks!