private static void enums()
{
//enums are handy when we have a list of values and we want to pick one from it
//enums are types (we can declare variables, properties, parameters, return values and so on)
ConsoleColor oldColor = Console.ForegroundColor;
//they are value types:
//we copied the value of ForegroundColor into oldColor but if we change one of the two, the other remains unchanged
Console.ForegroundColor = ConsoleColor.Red;
System.Console.WriteLine("I'M SEEING RED!");
System.Console.WriteLine(oldColor); //still gray
//we can only assign values picked up from the list, not simple strings or numbers
//Console.ForegroundColor = "Red"; //does not compile
//Console.ForegroundColor = 255; //does not compile
Console.ForegroundColor = ConsoleColor.Cyan; //compiles
Console.ForegroundColor = oldColor;
//we can also define our own enums and use them
//(you can find the definition in the file Enumerations.cs)
ItalianDays favoriteDay = ItalianDays.Sabato;
System.Console.WriteLine(favoriteDay); //Sabato
}
private static void M01()
{
//type name;
//name = expression;
//type name = expression;
//value types ==> struct, enum
//reference types ==> class, arrays, delegates
int a = 5; //inline memory
//a = null;
string s1 = null;
//Nullable<int> a2 = 5;
long l = long.MaxValue;
a = (int)l;
//bool b = (bool)a;
//bool b = 1;
a = 3;
a = 5;
int b = 10;
b = a++;
b = ++a;
b = a > 5 ? 10 : 20;
char c1 = 'a';
//c1 = "c";
//string s1 = 'asdg';
s1 = "asdg"; //
s1 = s1 + "aa"; //asdgaa
StringBuilder builder = new StringBuilder();
builder.Append("aa");
builder.Append("aa");
builder.Append("aa");
string s2 = builder.ToString();
s2.Trim();
s1 = a.ToString();
s1 = "5";
if (int.TryParse(s1, out a))
{
}
//enum
Method02();
Point p = new Point(3, 4);
Console.BackgroundColor = ConsoleColor.Yellow;
ItalianDays day = ItalianDays.Lunedi;
ItalianDays day2 = day;
day = ItalianDays.Martedi;
int d = (int)day;
Console.WriteLine(day);
Person simo = new Person(1, "Simo", "Cola");
simo.Id = 5;
simo.Name = "Simona";
simo.Surname = "Colapicchioni";
simo.FavoriteDay = ItalianDays.Mercoledi;
simo.DoSomething();
Console.WriteLine("What's the id?");
simo.Id = int.Parse(Console.ReadLine());
}