using System;

​

string x = "Spada";

string y = "Ettore";

    Console.WriteLine($"I'm {y} {x}");

    Console.WriteLine($"My name is composed by {y.Length} + {x.Length} letters");

string z = " Ettore Spada ";

    Console.WriteLine(z);

z.TrimStart();

    Console.WriteLine(z.TrimStart());

z.TrimEnd();

    Console.WriteLine(z.TrimEnd());

z.Trim();

    Console.WriteLine(z.Trim());

string t = z.Replace("Ettore Spada", "Chiara Laquintana");

    Console.WriteLine(t);

string a = z.Trim().Replace("Ettore Spada", "Chiara Laquintana");

    Console.WriteLine(a);

    Console.WriteLine(a.ToLowerInvariant());

    Console.WriteLine(a.ToUpperInvariant());

    Console.WriteLine(a.Contains("Chiara"));

    Console.WriteLine(a.StartsWith("Chi"));

    Console.WriteLine(a.EndsWith("ana"));

int b = 3;

    Console.WriteLine(b);

int c = 4;

    Console.WriteLine(b+c);

    Console.WriteLine(b*c);

    Console.WriteLine(c/b);

    Console.WriteLine(b-c);

​

​

​

​

​