C # (11) enumeration (Enums)

1.11 enumeration (Enums)

An enumeration Declaration defines a unified category name for constants with the same attributes. It is often used for constants with a known range during compilation. However, the specific values of these constants can be determined only during execution. For example, it is known that the primary colors are red, blue, and green, and they belong to the same color. It can be defined as follows:

*/
Enum Color {
Red,
Blue,
Green
}
/*

We create a shape class. Each shape has a color. Color is a property of "shape. However, the specific color can only be determined during execution:

*/
Class Shape
{
Public void Fill (Color color ){
Switch (color ){
Case Color. Red:
...
Break;
Case Color. Blue:
...
Break;
Case Color. Green:
...
Break;
Default:
Break;
}
}
}
/*

This File method illustrates how to assign a given color to the shape class. Enumeration is superior to ordinary Integer constants in that it makes the code easier to read, understand, and secure. The enumerated constants can be determined by the compiler. When used, the compiler can also check its validity. Enumeration is not actually unique to c. Hey, I will not introduce it in detail. Take the opportunity to take a shot! If anyone is interested, read your own books! (In order to avoid eating too much bananas, I will introduce the book "C programming FAQ" Tsinghua 1996. 29.00 RMB. Even though it is old, I can still see it in the bookstore)