✅ Programming Concepts Interview Questions with Answers

1️⃣ What is the difference between compiled and interpreted languages?
✅ Compiled Language: Code is converted into machine code before execution. Faster performance. Examples: C, C++, Java (partially compiled)
✅ Interpreted Language: Code executes line by line at runtime. Slower but easier debugging. Examples: Python, JavaScript

2️⃣ What is OOP? Explain its 4 pillars
✅ Object-Oriented Programming (OOP): A programming paradigm based on objects, classes, and real-world modeling.
🔹 4 Pillars:
1. Encapsulation: Wrapping data + methods together.
2. Abstraction: Showing only essential features.
3. Inheritance: One class acquires properties of another.
4. Polymorphism: Same function behaves differently.

3️⃣ Difference between Abstraction vs Encapsulation
Abstraction hides implementation details, while Encapsulation protects data.
Abstraction focuses on what to show, Encapsulation focuses on how to restrict access.

4️⃣ What is Polymorphism? Give a real example
✅ Polymorphism = One interface, multiple behaviors. Same method performs different actions based on context.
🎯 Real Example: A person behaves differently: At home → son, At office → employee

5️⃣ What is the difference between Stack and Heap memory?
Stack Memory stores function calls & local variables, automatically managed, and faster access.
Heap Memory stores objects & dynamic memory, manually or garbage collected, and slower access.

6️⃣ What is Recursion? When should you avoid it?
✅ Recursion: A function calling itself until a base condition is met.
🚫 Avoid recursion when memory is limited, deep recursive calls are possible, or iterative solution is simpler.

7️⃣ What is the difference between Pass by Value and Pass by Reference?
✅ Pass by Value: Copy of variable passed, changes don't affect original.
✅ Pass by Reference: Original variable reference passed, changes affect original.

8️⃣ What are mutable vs immutable objects?
✅ Mutable Objects: Can be changed after creation. Examples: List, Dictionary
✅ Immutable Objects: Cannot be modified after creation. Examples: String, Tuple

9️⃣ What is a Deadlock?
✅ Deadlock: A situation where two or more processes wait for each other indefinitely.

10️⃣ What is Multithreading?
✅ Multithreading: Running multiple threads (tasks) simultaneously within a program. Benefits: Better performance, faster execution.

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