Sahil-4

OOPS Interview Preparation

1. What is OOPS and why is it important? OOPS = Object-Oriented Programming System. Organizes code around objects instead of just functions. Increases modularity, maintainability, and reusability. Example: In an e-commerce app → Product, Cart, and User are objects, each with its own data + behavior.

2. Four Pillars of OOPS

Sahil-4

class TrieNode {
private:
    int T = 53;

    bool word;
    int prefix;

    vector<TrieNode*> childs;

    int getIndex(char ch) {