added options for single player and two player

main.c

@@ -24,26 +24,49 @@ int free_spaces();
 
 int main(int argc, char *argv[]){
     char flag = ' ';
+    int players;
     clear_board();
     
-    do{
-        flag = check_win();
-        if(free_spaces() == 0){
-            break;
-        }
+    printf("How many players? (1/2)\n> ");
+    scanf("%d", &players);
+
+    //this could be tidier i think
+    if(players == 1){
+        do{
+            flag = check_win();
+            if(free_spaces() == 0){
+                break;
+            }
+
+            print_board();
+
+            player_choice('X');
+            print_board();
 
-        print_board();
+            cpu_choice('O');
+            flag = check_win();
+            print_board();
 
-        player_choice('X');
-        flag = check_win();
-        print_board();
+        } while(flag == ' ');
 
-        player_choice('O');
-        flag = check_win();
-        print_board();
+    } else if(players == 2){
+            do{
+                flag = check_win();
+                if(free_spaces() == 0){
+                    break;
+                }
 
-    } while(flag == ' ');
+                print_board();
 
+                player_choice('X');
+                print_board();
+
+                player_choice('O');
+                flag = check_win();
+                print_board();
+
+            } while(flag == ' ');
+        }
     if(flag == ' ') 
         printf(BOLDMAGENTA "\nNo-one won!" RESET);
     else