Conway's Game of Life in Processing - incomplete day 1

//static variables
color yellow = color(239, 255, 23);
color gray = color(195, 196, 192);

//"instance" variables
boolean[][] grid;
int boxWidth, boxHeight;

void setup() {
  size(500, 500);
  background(gray);
  initGrid();
  drawLines();
}

void draw() {
  if (mousePressed == true) {
    changeElement();
    delay(100);
  }
  //drawGrid();  //to be completed day 2
  if(keyCode == ENTER){
    frameRate(5);
    //update();  //to be completed day 2
  }
  else if(keyCode == CONTROL){
    keyCode = SHIFT;
    initGrid();
    frameRate(60);
  }
}

void changeElement() {
  grid[mouseX/boxWidth][mouseY/boxHeight] = !grid[mouseX/boxWidth][mouseY/boxHeight];
}

//*********************//
//      DAY 1          //
//*********************//

//1. void initGrid()
//a) instantiate the grid to be 50 by 50. *Note: This will also initialize all elements to false, which is what we want.
//b) initialize the boxWidth and boxHeight to be the width and height divided by the number of boxes in each row
void initGrid() {

}

//2. void drawLines()
//* remember, the line function works like line(x1, y1, x2, y2);
//a) draw all lines going across from left to right
//b) draw all lines going vertically from top to bottom
//c) each line should be separated by boxWidth or boxHeight in either direction
//*there should be 50 lines in either direction
//*height and width are variables that contain the height and width, respectively
void drawLines() {

}

//3. int countNeighbors(int r, int c)
//This method takes the row number and column number and returns the number of neighbors @ that location
//a) initialize a counter
//b)check all 8 neighbors and increment counter if they are populated ( true )
//b1) check the 3 elements in the row above
//b2) check the 2 elements in the same row to the left or right.
//b3) check the 3 elements in the row below
//*be careful about bounds issues. For example, if r = 0, the row above would be -1, which does not exist and will cause an error
//c) return the count
int countNeighbors(int r, int c) {
    //get rid of the line below and write the method
    return 0;
}