feat: cs lesson 4 material

1 files changed, 37 insertions, 0 deletions

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()