ch3-enum

Chapter_3     ch3-Delegate                                                                        ch3-struct 

Contents:

Exercise_3-7     Flavor.cs

Exercise 3-7     TCS, p. 85

Exercise 3-7. Create a program that defines a Coin enumeration as described in the text and adds up a variety of coin types.

Coin.cs     TCS, p. 64

public class CoinTest

{

  enum Coin: short

  {

    Penny = 1, Nickel = 5, Dime = 10, Quarter = 25

  }

  public static void Main()

  {

    Coin penny = Coin.Penny;

    Coin nickel = Coin.Nickel;

    Coin dime = Coin.Dime;

    Coin quarter = Coin.Quarter;

    System.Console.WriteLine(penny + ": " + (short)penny);

    System.Console.WriteLine(nickel + ": " + (short)nickel);

    System.Console.WriteLine(dime + ": " + (short)dime);

    System.Console.WriteLine(quarter + ": " + (short)quarter);

    // change must be int, short gives a compile error:

    int change = (short)penny + (short)quarter; // short + short == int

    System.Console.Write("change = " + penny + " + " + quarter + " = ");

    System.Console.Write((short)penny + " + " + (short)quarter + " = ");

    System.Console.WriteLine(change);

    change -= (short)nickel; // change = change - (short)nickel;

    System.Console.Write("change = change - " +  nickel + " = ");

    System.Console.WriteLine(change);

    change += (short)dime * 2;

    System.Console.Write("change = change + " +  dime + " * 2 = ");

    System.Console.WriteLine(change);

  }

}

/*

mcs Coin.cs

mono Coin.exe

Penny: 1

Nickel: 5

Dime: 10

Quarter: 25

change = Penny + Quarter = 1 + 25 = 26

change = change - Nickel = 21

change = change + Dime * 2 = 41

*/

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Flavor.cs     TCS, p. 64

public class FlavorTest

{

  enum Flavor

  {

    Vanilla = 1, Chocolate = 2, Strawberry = 4, Coffee = 8

  }

  public static void Main()

  {

    Flavor conePref = Flavor.Vanilla | Flavor.Coffee;

    System.Console.WriteLine(conePref);

  }

}

/*

mcs Flavor.cs

mono Flavor.exe

9

*/

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