From c1eeda5056fc6523d5d6f166b4a64c851ab242f4 Mon Sep 17 00:00:00 2001
From: Aziz Sayfutdinov <aziz.sayfutdinov@gmx.at>
Date: Wed, 16 May 2018 11:17:54 +0200
Subject: [PATCH] new constant: STARTING_STACK

---
 src/mystack.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mystack.c b/src/mystack.c
index 3cafe5b..4ac9251 100644
--- a/src/mystack.c
+++ b/src/mystack.c
@@ -2,13 +2,15 @@
 #include <stddef.h>
 #include <stdlib.h>
 
+#define STARTING_STACK -1
+
 /*
 * instantiates a new stack and returns a pointer to it.
 * must be free'ed using stack_delete(...)
 */
 MyStack* stack_create(){
   MyStack* stack = (MyStack*)malloc(sizeof(MyStack));
-  stack->top = -1;
+  stack->top = STARTING_STACK;
   return stack;
 }