why the average donot come in the doss (the black screen)?and what is the wring in the code?

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

namespace The_Average
{
    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 1; i < 3 ; i++)
            {
                int x,y,z,c;

                Console.Write("the student" + i);
                Console.WriteLine(":");
                for (int j = 1; j < 4; j++)
                {
                    Console.Write("the material of degree" + j);
                    Console.WriteLine(":");
                    Console.ReadLine();
                    Console.WriteLine("The_Average"+result);
                }

            }
            int result = ave(x, y, z ,c);
            Console.WriteLine("the result"+result);
            Console.ReadKey();
        }
        static int ave(int x, int y, int z, int c);
    {
        int result = ((x + y + z + c) / 4);
        return result;
    }
}



}