C++ : pure virtual function

Question

Why do we need pure virtual functions when we can have empty body functions {}

Answer 1

PURE VIRTUAL FUNCTION is declared as :

Eg: virtual return_type function_name(function argument)=0;

The =0 tells the compiler that function has no body this virtual function will be called Pure virtual Function.

https://stackoverflow.com/questions/15075581/c-difference-between-virtual-0-and-empty-function