C# Interface (2)

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

namespace Interfaces2
{
    interface university
    {
        void uni_details(string uname);
    }

    interface college
    {
        void col_details(string cname,string loc);
    }

    class student : university, college
    {
        string name, cname, uname, course, loc;

        int s1, s2, s3, age;

        public void uni_details(string name)
        {
            uname = name;
        }

        public void col_details(string name, string location)
        {
            cname = name;
            loc = location;
        }

        public void read(string name, int s1, int s2, int s3, string course, int age)
        {
            this.name = name;
            this.s1 = s1;
            this.s2 = s2;
            this.s3 = s3;
            this.course = course;
            this.age = age;
        }

        public void cal()
        {
            int sum = s1 + s2 + s3;
            double avg = (double)(sum / 3.0);
            Console.WriteLine("Name: " + name + "\n" + "Age: " + age + "\n" + "Course: " + course);
            Console.WriteLine("University: " + uname);
            Console.WriteLine("Subject-1: " + s1 + "\n" + "Subject-2: " + s2);
            Console.WriteLine("Subject-3: " + s3);
            Console.WriteLine("Total: " + sum);
            Console.WriteLine("Average: " + avg);
        }
    }



    class Program
    {
        static void Main(string[] args)
        {
            student s = new student();
            s.uni_details("Azad University");
            s.col_details("Komeil", "Shahr-e Kord");
            s.read("Kamran", 97, 89, 84, "M.Sc", 24);
            s.cal();
        }
    }
}