using System; using System.Collections.Generic; using System.Drawing; using System.Globalization; // maps two values such that if we input one value it outouts the mapped value namespace SoloLearn { class Program { static void Main(string[] args) { // pair of integer and string; List> numpair = new List>(); numpair.Add(new Pair(1,"One")); numpair.Add(new Pair(2,"Two")); numpair.Add(new Pair(3,"Three")); numpair.Add(new Pair(4,"Four")); numpair.Add(new Pair(5,"Five")); numpair.Add(new Pair(6,"Six")); numpair.Add(new Pair(7,"Seven")); numpair.Add(new Pair(8,"Eight")); numpair.Add(new Pair(9,"Nine")); int x=0; string str = Console.ReadLine(); Console.WriteLine("Input {0}",str); Console.WriteLine("Output:"); foreach(Pair p in numpair){ if(int.TryParse(str,out x)) Console.Write(p.CompareTo(x)); else { if(p.CompareTo(str)==0)continue; Console.Write(p.CompareTo(str)); } } // pair of Color and string List> colormap = new List>(); colormap.Add(new Pair(Color.Red,"Red")); colormap.Add(new Pair(Color.Green,"Green")); colormap.Add(new Pair(Color.Blue,"Blue")); colormap.Add(new Pair(Color.Olive,"Olive")); colormap.Add(new Pair(Color.Yellow,"Yellow")); foreach(Pair p in colormap ) { if(p.CompareTo(str) == Color.Empty)continue ; else { Color clr = p.CompareTo(str); Console.Write("#"+clr.ToArgb().ToString("X").Substring(2,6)); // Color c = Color.FromArgb(x); //string s = p.CompareTo(c); //Console.Write(s); } } } } interface IComparable { T2 CompareTo(T1 object1); T1 CompareTo(T2 object2); } class Pair:IComparable { private T1 v1; private T2 v2; public Pair(T1 value1,T2 value2) { v1 = value1; v2 = value2 ; } public T2 CompareTo(T1 object1) { T2 val = default; if(v1.Equals(object1))val = v2; return val; } public T1 CompareTo(T2 object2) { T1 val = default; if(v2.Equals(object2))val = v1; return val; } } }

Generic Class Pair