/in/foo.cc: In function 'int main()':
/in/foo.cc:33:10: warning: the address of 'int PrimeCount(int*, int)' will always evaluate as 'true' [-Waddress]
  cout << PrimeCount << (b, n2) << endl;
          ^~~~~~~~~~
/in/foo.cc:33:28: warning: left operand of comma operator has no effect [-Wunused-value]
  cout << PrimeCount << (b, n2) << endl;
                            ^~