KwickClips Python · 41 sec · free
Why does undo remove the latest change?
Short answer. Because a stack pops the item that went in last.
How does a stack reverse a word?
Push every character, then pop them out in reverse order.
Remember
| Undo pops the last change |
| Pop letters to reverse |
How does undo know your last change? A stack. Undo pops the latest change. Here s holds the letters. Each pop gives the last letter, so r is reversed. Remember two things. Undo pops the last change. Popping letters reverses a word.
This clip is from the full lesson: Stack Implementation Using a List — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 12 Computer Science (083)
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