I'm using an old version of C++ and the syntax is failing, I need to use a different syntax but I couldn't, how can I fix it correctly?

A ShoppingSimulate' z D Bavurular ++book.cpp + Cart.cpp +++music.cpp Kaynak Dosyalar 4 E Ust Bilgi Dosyalar b [h] Cart.h ++main.cpp h movie.h ih music.h [h] Product.h