IntString

Program.cs

using System;

namespace ExperimentationsCSharp
{    
    public struct IntString : IEquatable<IntString>, IComparable<IntString>
    {
        int value;

        public IntString(int v)
        {
            this.value = v;
        }

        IntString(string str)
        {
            int.TryParse(str, out this.value);
        }

        public bool Equals(IntString other)
        {
            return this.value.Equals(other.value);
        }

        public static bool operator ==(IntString v1, IntString v2)
        {
            return v1.Equals(v2);
        }

        public static bool operator !=(IntString v1, IntString v2)
        {
            return !v1.Equals(v2);
        }

        public static IntString operator +(IntString v1, IntString v2)
        {
            return new IntString(v1.value + v2.value);
        }

        public static implicit operator IntString(int v)
        {
            return new IntString(v);
        }

        public static explicit operator IntString(string str)
        {
            return new IntString(str);
        }

        public static implicit operator int(IntString istr)
        {
            return istr.value;
        }

        public static implicit operator string(IntString istr)
        {
            return istr.value.ToString();
        }

        public override bool Equals(object obj)
        {
            if (obj is IntString)
                return this.Equals((IntString)obj);
            else
                return false;
        }

        public override int GetHashCode()
        {
            return this.value.GetHashCode();
        }

        public override string ToString()
        {
            return this.value.ToString();
        }

        public int CompareTo(IntString other)
        {
            return this.value.CompareTo(other.value);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            IntString a = 10;
            int b = 20;
            string c = "30";

            Console.WriteLine("b + a : {0}", b + a);
            Console.WriteLine("a + b : {0}", a + b);
            Console.WriteLine("a + c : {0}", a + c);
            Console.WriteLine("c + a : {0}", c + a);

            // Output: 
            // b + a : 30
            // a + b : 30
            // a + c : 1030
            // c + a : 3010
        }
    }
}