For Loop in Processing (snake game)

Processing Beginners
6

thank you so much my problem is getting the snake to increase in size after it eats food my formula is not working

int growth = 3;
final int X_SPEED = 1;

final int Y_SPEED = 1;

final int SNAKE_SIZE=15;
final int SNAKE_LENGTH=SNAKE_SIZE*growth;

int x = width/2;

int y =height/2;

float foodX = random(0, 500); 
float foodY = random(0, 500); 
int foodSize = 15;

boolean hit = false; //controls hit detection logic for when the snake hits the food 
int totalHits = 0; //the game will start at 0 points and in increase by 1 with each food catpure
final int MAX_HITS =5;

//final int SNAKE_LENGTH=3;



// ---------------------------------------------------------------------------



void setup() {

 size(500, 500);

 background(220);



 y=250;
}



//ellipse(250,290,SNAKE_SIZE,SNAKE_SIZE);

void draw() {

 background(220);



 if (x >= 500 || x <= 0) {

   background(0);
 }

 if (y >= 500 || y <= 0) {

   background(0);
 }

 moveSnake();
 checkIfKeyPressed();
 drawTarget();
 checkIfHitTarget();
}



void moveSnake() {

 //int y2=0;
fill(#FFFFFF);
 for (int iY=0; iY<SNAKE_LENGTH; iY++) {
 if(key == 'w'){
  ellipse(x, y-iY*SNAKE_SIZE, SNAKE_SIZE, SNAKE_SIZE);
 }
 else if(key == 's'){
  ellipse(x, y+iY*SNAKE_SIZE, SNAKE_SIZE, SNAKE_SIZE);
 }
  for (int iX=0; iX<SNAKE_LENGTH; iX++) {
     if(key == 'd'){
   ellipse(x - iX*SNAKE_SIZE, y, SNAKE_SIZE, SNAKE_SIZE); 
     }
     else if(key == 'a'){
    ellipse(x + iX*SNAKE_SIZE, y, SNAKE_SIZE, SNAKE_SIZE);
     }
   //y2+=20;
 }
}
}


void checkIfKeyPressed() {

 if (key=='w') {

   moveSnake();

   y -= Y_SPEED;
 }

else if (key=='s') {

   moveSnake();

   y += Y_SPEED;
 }

else if (key=='a') {

   moveSnake();

   x -= X_SPEED;
 }

else if (key=='d') {

   moveSnake();

   x += X_SPEED;
 }
}
void drawTarget(){
 fill(0);
rect(foodX,foodY, foodSize,foodSize);
}
void checkIfHitTarget(){
 if (dist(x, y, foodX, foodY)<=foodSize-5)
{
foodX = random(0+foodSize/2, 500-foodSize/2); 
foodY = random(0+foodSize/2, 500-foodSize/2);
hit = true;
}
if (hit)
{
totalHits += 1;
hit=!hit; 
growth++; 
}
}paste code here
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