📚 Understanding Stacks

💡 Concept Overview

Welcome! Master the LIFO principle used in programming and memory management.

🎯 The Mission

A Stack is a linear data structure. New items are added to the top and removed from the top. Think of it like a stack of plates!

🏗️ LIFO "The Golden Rule" Last In, First Out.
The last item added is the first one removed.

🌍 Stacks in Real Life

🥞
Pancakes
You put syrup on the top one first!
🍽️
Dirty Dishes
The top plate gets washed first.
🔙
Browser History
'Back' button visits the last page.

🧪 Stack Laboratory

Start pushing items to build your stack!

👩‍💻 Live Coding Studio

class Stack: def __init__(self): self.items = [] def push(self, item): self.items.append(item) def pop(self): return self.items.pop() def peek(self): return self.items[-1] stack = Stack() stack.push(10) stack.push("Hello") # pop removes "Hello" (LIFO)
class Stack { constructor() { this.items = []; } push(element) { this.items.push(element); } pop() { return this.items.pop(); } peek() { return this.items[this.items.length - 1]; } } const stack = new Stack(); stack.push(10); stack.push("Hello"); // pop removes "Hello" (LIFO)
#include <stack> #include <iostream> using namespace std; int main() { stack<string> s; s.push("10"); s.push("Hello"); // top() returns "Hello" cout << s.top() << endl; // pop removes "Hello" s.pop(); return 0; }
#include <stdio.h> #define MAX 100 typedef struct { char items[MAX][50]; int top; } Stack; void push(Stack* s, char* item) { s->items[++s->top] = item; } char* pop(Stack* s) { return s->items[s->top--]; } int main() { Stack s = {.top = -1}; push(&s, "10"); push(&s, "Hello"); // pop removes "Hello" return 0; }

📚 Time Travel vs. Waiting Line

Comparing Stack (LIFO) & Queue (FIFO)

📋 Operation Log
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⏬ Vertical Stack (LIFO)
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⏩ Horizontal Line (FIFO)
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