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• Try not to use using namespace std.

• iostream is a system header, so it should be surrounded by angle brackets as such:

   #include <iostream>
  

  Quotes are only used for user headers.

• system("PAUSE") isn't very good to use for a number of reasons, mostly relating to performance and portability.

  Here's one alternative that avoids these problems:

   std::cin.get();
  

  It'll ask for a character input (with Enter) instead of any key by itself, however.