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• <iostream> vs. <iostream.h> vs. “iostream.h” 7 answers

All my teacher say that it is <iostream.h> , but when I compile in g++, it gives error for iostream.h, but no error for iostream!

Also, it gives error for using cin with iostream. What should I do?

Last question, it gives error for using #include <conio>

Here is my code:

#include <iostream>
#include <conio>

int main() {
   int a,b;
   cout<<"enter two numbers:\n";
   cin>>a>>b;
   cout<<"sum is "<<a+b;
   return 0;
}

Also suggest any improvement it could make. Thank you a lot!