A wrapping implementation Conway's Game of Life in C++

game-of-life.cc

#include <iostream>
#include <cstring>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define HEIGHT 100
#define WIDTH 300

using namespace std;

void next(int env[WIDTH][HEIGHT]) {
  int cpy[WIDTH][HEIGHT];
  memcpy(cpy, env, WIDTH * HEIGHT * sizeof(int));

  for(int i = 0; i < WIDTH; i++) {
    for(int j = 0; j < HEIGHT; j++) {
      int NORTH = (HEIGHT + j - 1) % HEIGHT;
      int SOUTH = (HEIGHT + j + 1) % HEIGHT;

      int EAST = (WIDTH + i + 1) % WIDTH;
      int WEST = (WIDTH + i - 1) % WIDTH;

      int neighbours =
        env[EAST][NORTH] + env[WEST][NORTH] +
        env[EAST][SOUTH] + env[WEST][SOUTH] +
        env[i][SOUTH] + env[i][NORTH] +
        env[EAST][j] + env[WEST][j];

      if(neighbours < 2 || neighbours > 3)
        cpy[i][j] = 0;

      if(neighbours == 2)
        cpy[i][j] = env[i][j];

      if(neighbours == 3)
        cpy[i][j] = 1;
    }
  }

  memcpy(env, cpy, WIDTH * HEIGHT * sizeof(int));
}

void print(int env[WIDTH][HEIGHT]) {
  for(int i = 0; i < HEIGHT; i++) {
    for(int j = 0; j < WIDTH; j++) {
      cout << (env[j][i] ? '#' : ' ');
    }

    cout << endl;
  }
}

int main(){
  int todo[WIDTH][HEIGHT];

  srand(time(NULL));

  for(int i = 0; i < WIDTH; i++) {
    for (int j = 0; j < HEIGHT; j++) {
      todo[i][j] = rand() % 2;
    }
  }

  while (true) {
    system("clear");
    print(todo);
    next(todo);
    system("sleep .1");
  }

  return 0;
}