Conway's Game of Life

#include <iostream>
#include <chrono>
#include <thread>
#include <stdlib.h>

#define DELAY 300
#define WIDTH 240
#define HEIGHT 66

using namespace std;

void updateField(bool field[WIDTH][HEIGHT]);
void printField(bool field[WIDTH][HEIGHT]);
void randomizeField(bool field[WIDTH][HEIGHT]);

bool field[WIDTH][HEIGHT];
const char BLCK = 219;

int main(){
    chrono::milliseconds dura(DELAY);

    randomizeField(field);

    while(true){
        printField(field);
        this_thread::sleep_for(dura);

        updateField(field);
    }

    return 0;
}

void randomizeField(bool field[WIDTH][HEIGHT]){
    for(register int y = 0; y < HEIGHT; y++)
        for(register int x = 0; x < WIDTH; x++)
            if(rand() % 100 < 9) field[x][y] = true;
}

void printField(bool field[WIDTH][HEIGHT]){
    for(register int y = 0; y < HEIGHT; y++){
        for(register int x = 0; x < WIDTH; x++){
            if(field[x][y]) cout << BLCK;
            else cout << ' ';
        }

        cout << '\n';
    }
}

void updateField(bool field[WIDTH][HEIGHT]){
    int neighbors[WIDTH][HEIGHT];

    for(register int y = 0; y < HEIGHT; y++)
        for(register int x = 0; x < WIDTH; x++)
            neighbors[x][y] = 0;

    for(register int y = 0; y < HEIGHT; y++){
        for(register int x = 0; x < WIDTH; x++){
            if(field[x][y]){
                for(int x2 = x - 1; x2 <= x + 1; x2++){
                    for(int y2 = y - 1; y2 <= y + 1; y2++){
                        if(x2 == x && y2 == y) continue;

                        int x3 = x2 % WIDTH, y3 = y2 % HEIGHT;
                        if(x3 < 0) x3 += WIDTH;
                        if(y3 < 0) y3 += HEIGHT;

                        neighbors[x3][y3]++;
                    }
                }
            }
        }
    }

    for(register int y = 0; y < HEIGHT; y++){
        for(register int x = 0; x < WIDTH; x++){
            if(field[x][y]){
                int neighb = neighbors[x][y];
                if(neighb == 2 || neighb == 3) field[x][y] = true;
                else field[x][y] = false;
            }
            else{
                if(neighbors[x][y] == 3) field[x][y] = true;
            }
        }
    }
}