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C++/New, and confused


Im in the process of learning c++ from a book i have, Im using Dev-c++ 4.9.9. Win xp pro

1. Whats the deal with, #include <iostream.h> It dont work, it only worlks if i do #include <iostream>, and then put using namespace std;

2.I have seen this written several times clrscr();, i assume it clears the screen, but it doesnt work, i get the error  'clrscr' undeclared  (first use this function)

3. And finally. This is really bothering me, i get some programs off the web, its helps me learn, but i see, always people use void, indtead of int for the main function, like this
void main()

the book says to use int main(), and also, sometimes in the braces to put ( int argc, char *argv[]) argc.

I dont get it, when i try to compile using the void methode, i get the error 'main' must return int.

I am very troubled, i got all these programs from reliable sources, maybe i am confusing something with the old c language, i dont kno;w, but the progs should work, and they just dont, i have to always change th code around,
I have also tried to compile with gcc g++, same thing.

Thanks, for all you help, i appreciate it a lot.  


Actually <iostream.h> ans clrscr() works with the old c++ compilers. They were extensively used with C like programming.ususlly suppoted by Turbo C 3.0 etc
and the new complilers like Borland5.0 ( although it is qiute old version now ) doesnot support it.

name space std etc... They are the pure C++ statements supported by the new Compilers.

I hope this could help.



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