why not working

Question

https://www.sololearn.com/compiler-playground/chxA5X3AGz4T

in this code i wanted to write something diffrent. Why it didn't work?
And also what's that .o thing

Answer 1

That code works as expected.
You have to give 2 inputs like(5 4)
then the output will be 20

that `o` thing is called class name it can be whatever you want
you can even change that

TV o(x,y);
o.area();

TO

TV myTv(x, y);
myTv.area();

Answer 2

the link does not work :(