4. float x, y, xSpeed, ySpeed;
//
void setup(){
size(480,480);
frameRate(30);
colorMode(HSB,360,100,100,100);
noStroke();
fill(180,100,80,80);
x = random(width);
y = random(height);
xSpeed = random(-10,10);
ySpeed = random(-10,10);
}
//
void draw(){
background(0);
ellipse(x,y,40,40);
x += xSpeed;
y += ySpeed;
if(x > width || x < 0){
xSpeed *= -1;
}
if(y > height || y < 0){
ySpeed *= -1;

6. numbers[0]
numbers[1]
numbers[2]
int[] numbers = new int[5];
numbers[3]
numbers[4]
numbers[5]

10. int BALL_NUM = 100;
float[] x = new float[BALL_NUM]; //
float[] y = new float[BALL_NUM];
void draw(){
float[] xSpeed = new float[BALL_NUM];
background(0,0,20);
float[] ySpeed = new float[BALL_NUM];
for(int i=0; i<BALL_NUM; i++){
float[] bSize = new float[BALL_NUM];
fill(bColor[i]);
color[] bColor = new color[BALL_NUM];
ellipse(x[i],y[i],bSize[i],bSize[i]);
x[i] += xSpeed[i];
//
y[i] += ySpeed[i];
void setup(){ if(x[i] > width || x[i] < 0){
size(480,480); xSpeed[i] *= -1;
smooth(); }
frameRate(30); if(y[i] > height || y[i] < 0){
colorMode(HSB,360,100,100,100); ySpeed[i] *= -1;
noStroke(); }
for(int i=0; i<BALL_NUM; i++){ }
x[i] = random(width); }
y[i] = random(height);
xSpeed[i] = random(-10,10);
ySpeed[i] = random(-10,10);
bSize[i] = random(20,60);
bColor[i] =
color(random(200,240),random(80,100),random(80,1
00),70);
}
}

13. int BAR_NUM = 100; rect(x[i],0,bWidth[i],height);
float[] x = new float[BAR_NUM]; x[i] += xSpeed[i];
float[] xSpeed = new float[BAR_NUM]; if(x[i] > width || x[i] < -bWidth[i]){
float[] bWidth = new float[BAR_NUM]; xSpeed[i] *= -1;
color[] bColor = new color[BAR_NUM]; }
}
// }
void setup(){
size(640,240);
frameRate(30);
smooth();
colorMode(HSB,360,100,100,100);
noStroke();
for(int i=0; i<BAR_NUM; i++){
x[i] = random(width);
xSpeed[i] = random(-1,1);
bWidth[i] = random(2,200);
bColor[i] =
color(random(360),random(90,100),random(50,100),
20);
}
}
//
void draw(){
background(0);
for(int i=0; i<BAR_NUM; i++){
fill(bColor[i]);