New->Project->Class Library in c++ template. Name of project here is first_dll in
visual studio 2010. Now declare your function as public in first_dll.h file and
write the code in first_dll.cpp file as shown below.
文件代码
// first_dll.h
using namespace System;
namespace first_dll
{
public ref class Class1
{
public:
static double sum(int ,int );
// TODO: Add your methods for this class here.
};
}