C# 0 The Complete Reference

PART I

C h a p t e r   1 2 :  

I n t e r f a c e s ,   S t r u c t u r e s ,   a n d   E n u m e r a t i o n s  

333

PART IPART I

      "Red",

      "Red",

      "Red",

      "Reddish Green"

    };

    Apple i; // declare an enum variable

    // Use i to cycle through the enum.

    for(i = Apple.Jonathan; i <= Apple.McIntosh; i++)

      Console.WriteLine(i + " has value of " + (int)i);

    Console.WriteLine();

    // Use an enumeration to index an array.

    for(i = Apple.Jonathan; i <= Apple.McIntosh; i++)

      Console.WriteLine("Color of " + i + " is " +

                         color[(int)i]);

  }

}

The output from the program is shown here:

Jonathan has value of 0

GoldenDel has value of 1

RedDel has value of 2

Winesap has value of 3

Cortland has value of 4

McIntosh has value of 5

Color of Jonathan is Red

Color of GoldenDel is Yellow

Color of RedDel is Red

Color of Winesap is Red

Color of Cortland is Red

Color of McIntosh is Reddish Green

Notice how the 

for

 loops are controlled by a variable of type 

Apple

. Because the 

enumerated values in 

Apple

 start at zero, these values can be used to index 

color

 to obtain 

the color of the apple. Notice that a cast is required when the enumeration value is used to 

index the 

color

 array. As mentioned, there are no implicit conversions defined between 

integers and enumeration types. An explicit cast is required.