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Automatic conversion from double to string

using System; class Plus {     static void Main()     {         Console.WriteLine(+5);        // unary plus         Console.WriteLine(5 + 5);     // addition         Console.WriteLine(5 + .5);    // addition         Console.WriteLine("5" + "5"); // string concatenation         Console.WriteLine(5.0 + "5"); // string concatenation         // note automatic conversion from double to string     } }