For my midterm i created the pong game, it keeps score on the upper left hand corner untill you miss , in this case it starts again from 0. I was not able to put it on open processing as it did not work with java script.

//Varialble
int ballA = 15;//ball size
int ballX = ballA;
int ballY = 40;

float paddleX;
float paddleY = 8;
float paddleB = 8;
float paddleA = 150;//padle size

int AX = 5;//speed
int AY = 5;//speed

int score = 0;

//setup
void setup() {
size(800,600);//screen size
smooth();
noStroke();
paddleX = 790;//placement of paddle on the screen
}

//draw paddle and ball
void draw() {
background(92);
fill(255,225,0);//color paddle
rect(paddleX, paddleY, paddleB, paddleA);//paddle
fill(225);
ellipse(ballX, ballY, ballA*2, ballA*2);

if (C () || ballX < 0) {
AX *= -1;
}
if (ballY >= height-ballA || ballY <= 0) {
AY *= -1;
}
ballX= ballX + AX;
ballY= ballY + AY;

//paddle movement
if(keyPressed == true) {
if (key == CODED) {
if(keyCode == UP) {
if (paddleY >= 0) {
paddleY = paddleY – paddleA*0.25;
}
}
if(keyCode == DOWN) {
if(paddleY <= height – paddleA) {
paddleY = paddleY + paddleA*0.25;
}
}
}
}

//score
fill(255,225,0);
textSize(50);
text(score, 25, 50);
score();

if ( D ()) {
R();
}
}

//ball and paddle
boolean C() {
boolean C = false;
if ((ballX >= paddleX) && (ballX <= paddleX + paddleB)) {
if ((ballY >= paddleY) && (ballY <= paddleY + paddleA)) {
C = true;
}
}
return C;
}

boolean D() {
boolean D = false;
if (ballX > paddleX) {
D = true;
}
return D;
}

//score
void score() {
if (C ()) {
score = score + 1;
}
}

void R() {
ballX = ballA;
ballY = 40;
paddleY = 8;
score = 0;
}