EdgeVerve Systems Software Engineer interview questions

The interview was scheduled due to coding round that happened in my college ,At the starting of the interview they started with the basic introduction ,After it She asked me about what is Node,So i told about what are pointers then Node of linkedlist, then she asked me about OOP concepts CLASS,inheritance,types of polymorphism,then Constructors and Types of Constructors and then Copy constructor why it is used ,THEN she asked me to make a Object, After that She asked me about DML queries in SQL, and also some Query ,but i didnt knew sQL, THEN THEY ASKED ME A CODING QUESTION OF PERFECT SQUARE ,is a number perfect square and its count from a vector