Console.WriteLine("Hello World!");
string aFriend = "Bill";
Console.WriteLine(aFriend);
aFriend = "Maira";
Console.WriteLine("aFriend");
Console.WriteLine("Hello " + aFriend);
Console.WriteLine($"Hello {aFriend}");
string firstFriend = "Maria";
string secondFriend = "Sage";
Console.WriteLine($"My friends are {firstFriend} and {secondFriend}");
Console.WriteLine($"The name {firstFriend} has {firstFriend.Length} letters.");
Console.WriteLine($"The name {secondFriend} has {secondFriend.Length} letters.");
string greeting = " Hello World! ";
Console.WriteLine($[{greeting}];
string trimmedGreeting = greeting.Trimstart();
Console.WriteLine($"[{trimmedGreeting}]");
trimmedGreeting = greeting.TrimEnd();
Console.WriteLine($"[{trimmedgreeting}]");
trimmedGreeting = greeting.Trim();
Console.Writeline($"[{trimmedGreeting}]");
string sayHello = "Hello World!";
Console.WriteLine(sayHello);
sayHello.Replace("Hello", "Greetings");
Console.WriteLine(sayHello);
Console.WriteLine(sayHello.ToUpper());
Console.WriteLine(sayHello.ToLower());
string songLyrics = "You say goodbye, and I say hello";
Console.WriteLine(songLyrics.Contains("goodbye"));
Console.WriteLine(song.Lyrics.Contains("greetings"));
string songLyrics = ("You say goodbye, and I say hello");
Console.WriteLine(songLyrics.StartsWith("You"));
Console.WriteLine(songLyrics.StartsWith("goodbye"));
Console.WriteLine(songLyrics.EndsWith("Hello"));
Console.WriteLine(songLyrics.EndsWith("goodbye"));