using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Runtime.InteropServices;

namespace ConsoleApplication3
{
    class VCDLLTest3
    {
        [DllImport("VCDLLTest3.dll")]
        public static extern int myAdd(int a, int b);
        [DllImport("VCDLLTest3.dll")]
        public static extern int mySubtr(int a, int b);
    }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("1+2="
                             +VCDLLTest3.myAdd(1, 2)
                             );
            Console.WriteLine("3-4="
                             +VCDLLTest3.mySubtr(3, 4)
                             );
        }
    }
}