Is it <iostream> or <iostream.h>?

Answer 1

1st is anew version and 2nd one is of old version

Answer 2

modern compilers....1st one
ancient compilers ...2nd one

Answer 3

both are correct. depends upon the compiler type you use.

Answer 4

it with be correct to write 1st

Answer 5

in c++ u should use <iostream.h>