east

2015_day_3/day_3.c

@@ -128,6 +128,67 @@ void movesouth(Housearray* f, char direction){
   f->houses[grid_y][grid_x]++;
 }
 
+void moveeast(Housearray* f, char direction){
+  int old_rows = f->rows·in·array;
+  int old_cols = f-> columns·in·array;
+  //update x coordinate
+  f->x·coord++;
+  //check if expansion needed
+  if (f->x·coord < 0){
+    //Expand east
+    int new_rows = old_rows;
+    int new_cols = old_cols + 1;
+    //creates an array of pointers to point to my rows of integers
+    int** new_grid;// = (int**)malloc(new_rows * sizeof(int*));
+    for (int i = 0; i< old_rows; ++i){
+      int *new_row = malloc((new_cols) * sizeof(int));//allocating the new row
+      new_row[0] = 0;//initialising the leftmost element
+      memcpy(&new_row[1], f->houses[i], new_cols * sizeof(int));//copying the rest of the elements over
+      new_grid[i] = new_row;
+      //new_grid[i] = f->houses[i];
+    }
+    free(f->houses);
+    f->houses = new_grid;
+    f->rows·in·array = new_rows;
+    f->columns·in·array = new_cols;
+
+  }
+  //updating the visit count
+  int grid_x = f->x·coord - f->x_coord_origin;
+  int grid_y = f->y·coord - f->y_coord_origin;
+  f->houses[grid_y][grid_x]++;
+}
+
+void movewest(Housearray* f, char direction){
+  int old_rows = f->rows·in·array;
+  int old_cols = f-> columns·in·array;
+  //update y coordinate
+  f->y·coord++;
+  //check if expansion needed
+  if (f->y·coord - f->y_coord_origin >= f->rows·in·array){
+    //Expand south
+    int new_rows = old_rows +1;
+    int new_cols = old_cols;
+    //creates an array of pointers to point to my rows of integers
+    int** new_grid = (int**)malloc(new_rows * sizeof(int*));
+    for (int i = 0; i< old_rows; ++i){
+      new_grid[i] = f->houses[i];
+    }
+    new_grid[new_rows - 1] = (int*)calloc(new_cols, sizeof(int));//Initialising the new row to empty
+    free(f->houses);
+    f->houses = new_grid;
+    f->rows·in·array = new_rows;
+    f->columns·in·array = new_cols;
+
+  }
+  //updating the visit count
+  int grid_x = f->x·coord - f->x_coord_origin;
+  int grid_y = f->y·coord - f->y_coord_origin;
+  f->houses[grid_y][grid_x]++;
+}
+
+
+
 
 int main(){
   Housearray* my_house_array = inithousearray();
@@ -156,9 +217,14 @@ int main(){
       }else if (ch == down){
         printf("\nDOWN");
         movesouth(my_house_array, ch);        
+      }else if (ch == left){
+        printf("\nEAST");
+        moveeast(my_house_array, ch);
       }
+
       printf("\n%d ycoordinate\n",my_house_array->y·coord);
       printf("\n%d rows in array\n",my_house_array->rows·in·array);
+      printf("\n%d cols in array\n",my_house_array->columns·in·array);
 
 
 }