Program.cs

using System;

namespace TupleTypes
{
    /// <summary>
    /// Tuple types
    /// https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-7#tuples
    /// </summary>
    class Program
    {
        static void Main(string[] args)
        {
            var foo = (val1: 1, val2: 3);
            var bar = (val1: 1, val2: 3);

            Console.WriteLine(foo == bar); // also true

            (int a, int b) values1 = (1, 5);
            (int c, int d) values2 = (1, 5);

            Console.WriteLine(values1 == values2); // also true

            (int x, int y) = (12, 13);

            Console.WriteLine($"Values x:{x} y:{y}");

            int x2;
            int y2;

            (x2, y2) = (1, 2);
            
            Console.WriteLine($"Values x:{x2} y:{y2}");

            (int, (int, int)) nestedTuple = (1, (2, 3));
            
            Console.WriteLine(nestedTuple == (1, (2, 3))); // also true
            
            var left = (a: 5, b: 10);
            (int? a, int? b) nullableMembers = (5, 10);
            
            Console.WriteLine(left == nullableMembers); // also true
            
            (string firstName, string lastName) person01 = ("İbrahim", "ATAY");
            var val01 = GetPersonInfo(person01);

            Console.WriteLine($"GetPersonInfo by {val01.firstName}  {val01.lastName}");
            
            var val02 = OverrideGetPersonInfo01();
            
            Console.WriteLine($"OverrideGetPersonInfo01 by {val02.id} {val02.firstName} {val02.lastName}");
            
            (int id, string firstName, string lastName) person02 = (1, "İbrahim", "ATAY");
            
            var val03 = OverrideGetPersonInfo01(person02);
            
            Console.WriteLine($"OverrideGetPersonInfo01 by {val03.id} {val03.firstName} {val03.lastName}");
            
            var val04 = OverrideGetPersonInfo01(person01);
            
            Console.WriteLine($"OverrideGetPersonInfo01 by {val04.id} {val04.firstName} {val04.lastName}");

            (Course course, Student student, Instructor instructor) university =
            (
                course: new Course
                {
                    CourseName = "Modern Compiler Design"
                },
                student: new Student
                {
                    FullName = "İbrahim ATAY"

                },
                instructor: new Instructor
                {
                    FullName = "James Gosling"
                }
            );

            Console.WriteLine($"university Course:{university.course} Instructor:{university.instructor} Student:{university.student}");
        }

        static (string firstName, string lastName) GetPersonInfo(
            (string firstName, string lastName) person)
        {
            return (firstName: person.firstName, lastName: person.lastName);
        }
        
        static (int id, string firstName, string lastName) OverrideGetPersonInfo01()
        {
            return (1, firstName: "İbrahim",lastName: "ATAY");
        }

        static (int id, string firstName, string lastName) OverrideGetPersonInfo01(
            (int id, string firstName, string lastName) person)
        {
            return person;
        }
        
        static (int id, string firstName, string lastName) OverrideGetPersonInfo01(
            (string firstName, string lastName) person)
        {
            return (1, firstName: person.firstName, lastName: person.lastName);
        }
    }

    class Course
    {
        public string CourseName { get; set; }

        public override string ToString()
        {
            return CourseName;
        }
    }
    
    class Student
    {
        public string FullName { get; set; }

        public override string ToString()
        {
            return FullName;
        }
    }

    class Instructor
    {
        public string FullName { get; set; }
        
        public override string ToString()
        {
            return FullName;
        }
    }
}