Learn notes from scratch (Day 25)-Class and struct definitions

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Swift The syntax for classes and struct-body definitions in is very similar. Classes use class keywords to define classes, and struct keywords are used to define structs, and their syntax is formatted as follows:

Class class Name {Defines a member of a class}struct struct name {Defines a member of the struct body}

from the syntax format, Swift The definitions in the classes and structs in are more similar to the Java Grammar, does not need to be like C + + and the objective-c in this way, the interface and implementation parts are placed in different files.

Let's look at an example:

Classes defined by class employee {             //     var no: Int = 0                var name: String =  ""          var job: String?               var salary: Double = 0              var dept: Department?          } struct department {          // Defined structure Body     var no: Int = 0                var name: String =  ""      }

Some attributes are defined inside.

Employee and the Department It's about the relationship. .

The following statements are instantiated:

Let emp = Employee () var dept = Department ()

Employee () and the Department () is to instantiate the constructor that calls them.

Note: The class is declared as Let constant is still var What about the variables? The class is generally declared as a Let constant from the programming process, because the class is a reference data type, and declaring that a let constant simply means that the reference cannot be modified, but the object that the reference points to can be modified.

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Learn notes from scratch (Day 25)-Class and struct definitions