From 714f574a0029af1fd7de0989eda28df46f5bec4f Mon Sep 17 00:00:00 2001 From: Zhongheng Liu Date: Tue, 15 Oct 2024 15:02:59 +0300 Subject: feat: cs lesson 4 material --- lesson4.py | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 lesson4.py (limited to 'lesson4.py') diff --git a/lesson4.py b/lesson4.py new file mode 100644 index 0000000..e99f231 --- /dev/null +++ b/lesson4.py @@ -0,0 +1,37 @@ +stack = [None for index in range(0,10)] +basePointer = 0 +topPointer = -1 +stackFull = 10 + +def push(item): + global stack, topPointer + topPointer += 1 + if topPointer >= stackFull: + print("ERROR Cannot insert more.") + return + stack[topPointer] = item + print(stack) +def pop(): + global stack, topPointer + if topPointer < basePointer: + print("ERROR List is empty, cannot pop.") + return + itemPopped = stack[topPointer] + print(f"I popped this {itemPopped}") + stack[topPointer] = None + topPointer -= 1 + print(stack) +def test(): + push(1) + push(2) + push(69) + + pop() + pop() + + print(stack) + + pop() + pop() + +test() -- cgit