This code come from Bjarne Stroustrup's programming and practice book. Why isnt this working. Im using Visual studio 2013
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#include "std_lib_facilities.h"
int main() // C++ programs start by executing the function main
{
cout << "Hello, World!\n"; //output " Hello, World ! "
keep_window_open(); //wait for a character to be entered
return 0;
}