main.h

#include<string>
#include <sstream>
#include <windows.h>
#include <iostream>
using namespace std;
#ifndef __MAIN_H__

#define export extern "C" __dclspec (dllexport)

#define __MAIN_H__

/*  To use this exported function of dll, include this header
 *  in your project.
 */

#define DLL_EXPORT __declspec(dllexport)


#ifdef __cplusplus
extern "C"
{
    double DLL_EXPORT soma(double a, double b);
    double DLL_EXPORT subtracao(double a, double b);
    string DLL_EXPORT mensagem(string x);
}
#endif


#endif // __MAIN_H__