Header file

Question

some people write #include <iostream.h>
but when I write the program will error
why ?

Answer 1

iostream is a standard header.

iostream.h is a non-standard header that was very common in pre-standard c++, and is what iostream evolve from . its still common to have iostream.h around , presumably for use with older programs

Answer 2

thank you for reply

Answer 3

welcome sir !