C # basic syntax Learning (1 ),

C # basic syntax Learning (1 ),

1. the C # constant data type can only be the original data type: int, bool, char, double, string, etc.

2. Access modifiers are used in C # To describe the accessibility of variables. The values can be private, protected, internal, protected internal, and public.

Public: Access is unrestricted and can be accessed anywhere.

Protected: access is limited to the current class and the derived class.

Internal: access is limited to the current Assembly.

Protected internal: access is limited to the current Assembly or classes derived from the current class.

Private: access is limited to the current class.

3. the variables declared in the method body cannot use access modifiers such as private and public.

4. The class member variables can be divided into two types: instance variables and static variables.

The instance variable belongs to the class instance, and each class instance has a backup of the instance variable. Instance variables of each class can be changed independently without affecting each other.

Static variables belong to the class. Each class and all its instances have only one backup of static variables. Changes to static variables anywhere will affect other instances.