visual studio 2010 - #include -

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What's wrong with the code snippet below that VS2010 will not compile it? 

  int m = sqrt (n);   
 (I am trying to ensure that there is a prime prime ...)   
 
 
 You have to pass a specific floating point type on  sqrt  - there is no integer overload. Use eg:  
  long double mi = sqrt (static_cast & lt; long double & gt; (n));   
 As you include  cmath  not  math.h , I'm assuming that you want C ++ For C, you will need to use eg:  
  double M = sqrt ((double) n);   
 You just error means that the compiler can not automatically select a  sqrt  function for you - you converted the integer passed to a floating point type And the compiler does not know which floating point type and the  sqrt  function should be selected.

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