What is difference between "using namespace std; , return 0;" and "conio.h , clrscr(); , getch();"

Question

Last week my software teacher taught us the basics of c++ (in turbo c++) where she used header file <conio.h> and used clrscr(); and getch(); in the program ... Sololearn Uses Namespace std and return0; commands .. can anyone explain me the difference between them. Thankyou 😊

Answer 1

because your c IDE is turbo C

standard c++ using cont and cin