Improves code readability

defs.h

@@ -0,0 +1,3 @@
+#define for_column for (int column = 0; column < width; column++)
+#define for_line for (int line = 0; line < height; line++)
+#define for_position for_line for_column

game.h

@@ -0,0 +1,15 @@
+#include "defs.h"
+
+int randomCellCreation(unsigned density){
+  return rand() < (RAND_MAX / density) ? 1 : 0;
+}
+
+void game(unsigned width, unsigned height){
+  unsigned universe[height][width];
+  for_position universe[line][column] = randomCellCreation(4);
+  while (1) {
+    populate(width, height, universe);
+    generation(width, height, universe);
+    usleep(200000);
+  }
+}

generation.h

@@ -0,0 +1,40 @@
+#include "defs.h"
+
+struct Cells{
+  unsigned currentCell;
+  unsigned top, topRight, topLeft;
+  unsigned bottom, bottomRight, bottomLeft;
+  unsigned left, right;
+};
+
+int cellStatus(struct Cells cell){
+  int living = cell.top + cell.bottom + cell.left + cell.right + cell.topLeft + cell.topRight + cell.bottomRight + cell.bottomLeft;
+
+  if (cell.currentCell){
+    if (living <= 1 || living >= 4) return 0;
+    if (living == 2 || living == 3) return 1;
+  } else {
+    return (living == 3) ? 1 : 0;
+  }
+}
+
+void generation(unsigned width, unsigned height, unsigned u[width][height]){
+  unsigned new[width][height];
+  struct Cells cell;
+
+  for_position {
+    cell.currentCell = u[line][column];
+    cell.top         = u[line - 1][column];
+    cell.bottom      = u[line + 1][column];
+    cell.left        = u[line][column - 1];
+    cell.right       = u[line][column + 1];
+    cell.topLeft     = u[line - 1][column - 1];
+    cell.topRight    = u[line - 1][column + 1];
+    cell.bottomLeft  = u[line + 1][column - 1];
+    cell.bottomRight = u[line + 1][column + 1];
+
+    new[line][column] = cellStatus(cell);
+  }
+
+  for_line for_column u[line][column] = new[line][column];
+}

main.c

@@ -1,80 +1,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
-
-#define for_column for (int column = 0; column < w; column++)
-#define for_line for (int line = 0; line < h; line++)
-#define for_column_by_line for_column for_line
-#define for_position for_line for_column
-
-void show(void *u, int w, int h){
-  int (*universe)[w] = u;
-  printf("\033[H");
-  for_line {
-    for_column printf(universe[line][column] ? "#" : "  ");
-    printf("\n");
-  }
-  fflush(stdout);
-}
-
-int nature(int currentCell, int top, int bottom, int left, int right, int topLeft, int topRight, int bottomRight, int bottomLeft){
-  int living = top + bottom + left + right + topLeft + topRight + bottomRight + bottomLeft;
-
-  if (currentCell){
-    if (living <= 1 || living >= 4){
-      return 0;
-    }
-
-    if (living == 2 || living == 3){
-      return 1;
-    }
-
-  } else {
-    if (living == 3) {
-      return 1;
-    } else {
-      return 0;
-    }
-  }
-}
-
-
-void evolve(void *u, int w, int h){
-  unsigned (*universe)[w] = u;
-  unsigned new[w][h];
-  int currentCell, topLeft, top, topRight, bottomLeft, bottom, bottomRight, left, right;
-
-  for_position {
-    currentCell = universe[line][column];
-    top         = universe[line - 1][column];
-    bottom      = universe[line + 1][column];
-    left        = universe[line][column - 1];
-    right       = universe[line][column + 1];
-    topLeft     = universe[line - 1][column - 1];
-    topRight    = universe[line - 1][column + 1];
-    bottomLeft  = universe[line + 1][column - 1];
-    bottomRight = universe[line + 1][column + 1];
-
-    new[line][column] = nature(currentCell, topLeft, top, topRight, bottomLeft, bottom, bottomRight, left, right);
-  }
-
-  for_line for_column universe[line][column] = new[line][column];
-}
-
-int defineLiveCell(){
-  return rand() < RAND_MAX / 5 ? 1 : 0;
-}
-
-void game(int w, int h){
-  unsigned universe[h][w];
-  for_column_by_line universe[line][column] = defineLiveCell();
-  while (1) {
-    show(universe, w, h);
-    evolve(universe, w, h);
-    usleep(200000);
-  }
-}
+#include "generation.h"
+#include "populate.h"
+#include "game.h"
 
 int main(){
-  game(40, 40);
+  system("clear");
+  game(80, 40);
 }

populate.h

@@ -0,0 +1,9 @@
+#include "defs.h"
+
+void populate(unsigned width, unsigned height, unsigned u[width][height]){
+  printf("\033[H");
+  for_line {
+    for_column printf(u[line][column] ? "#" : " ");
+    printf("\n");
+  }
+}