calling user defined class

Question

How to call a user-defined class in the main class?
And i don't think we have to explicitly mention a main class as we do in other programming languages like C or Java,isnt it?

Answer 1

Piyush Sharma , you are kindly asked to do a try by yourself first. Link your code here. Thanks!

Answer 2

Which language your referring? What you intend for "call a class"?

P.S. c language has not class concept