andrewmilson · February 25, 2016 11:37 · Feb 24, 2016 · Feb 24, 2016 · Feb 24, 2016
diff --git a/game-of-life.cc b/game-of-life.cc
@@ -1,5 +1,5 @@
 #include <iostream>
-#include <string>
+#include <cstring>
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>

diff --git a/game-of-life.cc b/game-of-life.cc
@@ -0,0 +1,73 @@
+#include <iostream>
+#include <string>
+#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;
+}