Computer Science Interview Books

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🧠 SQL Interview Question (Moderate–Tricky & Conversion Funnel Analysis) 📌 actions(user_id, action, action_date) ❓ Ques : 👉 Find the number of users who added to cart but never made a purchase. 🧩 How Interviewers Expect You to Think • Identify users who performed "add_to_cart" • Identify users who performed "purchase" • Use filtering + exclusion logic • Apply LEFT JOIN or NOT EXISTS 💡 SQL Solution SELECT COUNT(DISTINCT a.user_id) AS users_not_converted FROM actions a LEFT JOIN actions p ON a.user_id = p.user_id AND p.action = 'purchase' WHERE a.action = 'add_to_cart' AND p.user_id IS NULL; 🔥 Why This Question Is Powerful • Tests conversion & funnel thinking (key for product roles) • Evaluates understanding of joins + filtering logic • Common in e-commerce & user behavior analysis • Shows ability to derive business insights from data ❤️ React if you want more such real interview-level SQL questions 🚀

✅ Top Programming Basics Interview Questions with Answers 🧠💻 1️⃣ What is a variable? Answer: A variable is a named container used to store data in a program. Its value can change during execution. Example:

name = "Alice"
age = 25

2️⃣ What are data types? Answer: Data types define the kind of value a variable can hold. Common types: – int: Integer (e.g., 5) – float: Decimal (e.g., 3.14) – char / str: Character or String – bool: Boolean (True/False) 3️⃣ What are operators in programming? Answer: Operators perform operations on variables/values. – Arithmetic: +, -, *, / – Comparison: ==,!=, >, < – Logical: &&, ||,! (or and, or, not) – Assignment: =, +=, -= 4️⃣ What is type casting? Answer: Type casting means converting one data type to another. Example (Python):

x = int("5")     # Converts string to integer

5️⃣ What is the purpose of comments in code? Answer: Comments are used to explain code. They're ignored during execution. – Single-line: // comment or # comment – Multi-line:

"""
This is a
multi-line comment
"""

6️⃣ How do you take input and display output? Answer: Python Example:

name = input("Enter your name: ")
print("Hello", name)

C++ Example:

cin >> name;
cout << "Hello " << name;

7️⃣ What is the difference between a statement and an expression? Answer: – Expression: Returns a value (e.g., 2 + 3) – Statement: Performs an action (e.g., x = 5) 8️⃣ What is the difference between compile-time and run-time? Answer: – Compile-time: Errors detected before execution (e.g., syntax errors) – Run-time: Errors during execution (e.g., divide by zero) 💬 Double Tap ❤️ for more!

ChatGPT Prompt Cheat Sheet

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Do these 4 things to 10x your responses while asking for referrals: 1. Be personal. (never use AI) I get a ton of messages that are either written by AI or obviously copy and pasted to 100 people. Be personal by mentioning something you have in common with the person you’re messaging or what you got out of one of their posts. 2. Have a specific job that you want to apply for and send the link. “Can you look and see if there are any openings?” is incredibly rude and inconsiderate of the person’s time. If you want them to help you with a referral, do the work for them by sending them the link, why you’re a good fit, and other needed info. 3. Reach out to people who are active on LinkedIn, but not content creators. Everytime there’s an opening at my company, I get 50 messages asking for a referral. As much as I want to, I can’t refer everyone. Therefore, look for those to connect with at a company you’re interested in that post occasionally on LinkedIn, but are not content creators. These people will be active enough to see your message, but not have 3 dozen other messages asking for the same thing. 4. Build relationships way before you ask for a referral. While I don’t do many referrals bc of how many inquiries I get, I’d be much more likely to refer someone who adds to the conversation by commenting on my posts, creates good posts themselves, and overall seems like a smart, nice person. Doing this turns you from a complete stranger to a friend. I know a lot of people are pressed for time on here, but building relationships is what networking is all about. Do that effectively and your network may offer you referrals when there’s an opening. Join this channel for more Interview Preparation Tips: https://t.me/jobinterviewsprep ENJOY LEARNING 👍👍

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🚀 Complete C++ Syllabus Roadmap (Beginner to Expert) ⚙️ 🔰 Beginner Level: 1. Intro to C++: Setup, IDEs, First Program (Hello World) 2. Variables & Data Types: int, float, char, bool, double, type casting 3. Operators: Arithmetic, Relational, Logical, Bitwise, Assignment 4. Control Flow: if-else, switch-case, for, while, do-while loops 5. Functions: Function Declaration, Definition, Call, Arguments, Return Values 6. Arrays: Single & Multi-Dimensional Arrays 7. Basic I/O: cin, cout 8. Basic Projects: Calculator, Simple Number Games ⚙️ Intermediate Level: 1. Pointers: Introduction, Pointer Arithmetic, Dynamic Memory Allocation 2. Strings: C-style strings, std::string 3. Structures & Unions: User-Defined Data Types 4. Object-Oriented Programming (OOP): • Classes & Objects • Inheritance • Polymorphism (Function Overloading, Operator Overloading, Virtual Functions) • Abstraction, Encapsulation 5. File Handling: Reading from & Writing to Files 6. Exception Handling: try, catch, throw 🏆 Expert Level: 1. Data Structures: • Linked Lists (Singly, Doubly, Circular) • Stacks & Queues • Trees (Binary Trees, BSTs, AVL Trees) • Graphs (Representation, Traversal Algorithms) • Hash Tables 2. Algorithms: Sorting & Searching Algorithms, Dynamic Programming 3. Templates: Generic Programming 4. Standard Template Library (STL): Containers, Iterators, Algorithms 5. Multi-threading & Concurrency: 6. Memory Management: Smart Pointers, RAII 7. Design Patterns: Singleton, Factory, Observer, etc. 8. Networking: Sockets, Client-Server communication 9. Advanced Projects: Game Development, System Programming 💡 Bonus: Learn CMake, Debugging Techniques, and C++20 Features 👍 Tap ❤️ for more