In my school we use #include<iostream.h> and don't use using namespace std and return = 0 ..instead they use getch(); why??

Question

Are they different programming languages??

Answer 1

Because you are learning, like I am, C programming language, and namespace std and return 0 are used in C++

Answer 2

you were learning c at first.. the return type of main function was void.. that is why you did not use return 0. and using namespace std is not used because you were not using same names again and Again