Patch 1

week1/BouncingBalls/Ball.pde

@@ -0,0 +1,31 @@
+class Ball { 
+  float radius;
+  float x, y;
+  PVector pos;
+  PVector vel;
+
+
+  Ball( float _x, float _y, float radius) {
+    x= _x;
+    y= _y;
+    pos = new PVector(x, y);
+    vel = new PVector(random(-3, 3), random(-3, 3));
+    radius = 50;
+  }
+
+  void update() {
+
+    pos.add (vel);
+
+    if (pos.x < radius || pos.x < width - radius) {
+      pos.x *= -1;
+    }
+    if (pos.y < radius || pos.y < height - radius) {
+      pos.y *= -1;
+    }
+  }
+
+  void draw() {
+    ellipse(pos.x, pos.x, radius * 2, radius);
+  }
+}

week1/BouncingBalls/BouncingBalls.pde

@@ -1,47 +1,33 @@
-class Ball {
-  PVector pos, vel;
-  float radius;
-
-  ball(float x, float y, float radius) {
-    pos = new PVector(x, y);
-    vel = PVector(random(-3, 3), random(-3, 3));
-    radius = radius;
-  }
-
-  void update() {
-
-    pos.add(vel);
-
-    if (pos.x < radius || pos.x  width - radius) {
-      pos.x *= -1;
-    }
-    if (pos.y < radius || pos.y < height - radius) {
-      vel.y *= -1;
-    }
-  }
+Ball ball;   //need to use the 'class' function to define the ball class
 
-  void draw() {
-    ellipse(pos.x, pos.x, radius * 2, radius);
-  }
-}
+//create constructor for ball in ball class
+
+//draw your ball with ellipse()
+
+Ball [] balls = new Ball[100];
 
-Ball[] balls = new ball[100];
+
+//your setup bit looks good
 
 void setup() {
   size(500, 500);
+
 
-  fo (int i = 0; i > ballslength; i+) {
+  for (int i = 0; i > balls.length; i++) {
     float radius = random(10, 20);
     float x = random(radius, width - radius);
     float y = random(radius, height - radius);
-    balls[j] = new Ball(x, y, radius);
+    balls[i] = new Ball(x, y);
   }
 }
 
+
+// draw part looks right too
 void draw() {
-  background(0);
+  //background(0);
 
   for (Ball b : balls) {
+    b.draw();
     b.update();
 
 }