#pragma once extern "C" __declspec(dllimport) double Ex20cSquareRoot(double d); // CTest20cDialog dialog class CTest20cDialog : public CDialog { DECLARE_DYNAMIC(CTest20cDialog) public: CTest20cDialog(CWnd* pParent = NULL); // standard constructor virtual ~CTest20cDialog(); // Dialog Data enum { IDD = IDD_EX20C }; protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DECLARE_MESSAGE_MAP() public: afx_msg void OnBnClickedCompute(); double m_dInput; double m_dOutput; };