What is four pillars of oops. What is array and vector. Implement queue using stack. Project based questions.

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The four pillars of OOP are encapsulation, inheritance, polymorphism, and abstraction. Arrays are fixed-size data structures, while vectors are dynamic arrays. A queue can be implemented using two stacks.

Encapsulation: Bundling data and methods that operate on the data into a single unit.
Inheritance: Creating new classes based on existing classes, inheriting their attributes and methods.
Polymorphism: Objects of different classes can be treated as objects of a common superclass.
Abstraction: Hiding the complex implementation details and showing only the necessary features.
Arrays: Fixed-size data structures that store elements of the same type in contiguous memory locations. Example: int[] arr = new int[5];
Vectors: Dynamic arrays that can resize themselves automatically when elements are added or removed. Example: Vector vec = new Vector<>();
Implementing a queue using two stacks involves using one stack for enqueue operations and another stack for dequeue operations.

What is four pillars of oops. What is array and vector. Implement queue using stack. Project based questions.

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