Dark Horse Programmer--oc Language Set method and get method

@public members can be arbitrarily assigned, you should use the Set method and the Get method to manage access to members

A) Set method

1. Function: Provide a method to set the value of member variables to the outside world, can be in the method to face the parameters of the corresponding filter

2. Naming conventions:

1> method name must begin with set

2> set followed by the name of the member variable, the first letter of the member variable must be capitalized

3> return value must be void

4> must receive a parameter, and the parameter type is consistent with the member variable type

The name of the 5> parameter cannot be the same as the member variable name

II) Get method

Get method

1. Function: Returns the member variable inside the object

2. Naming conventions:

1> must have a return value, and the return value type must be the same as the member variable type

The 2> method name is the same as the member variable name

3> does not need to receive any parameters

c) member variable naming specification

The member variable must begin with an underscore _

Effect: 1. To separate the name of the member variable from the Get method

2. Can be separated from the local variables, a see the beginning of the underscore variable, is usually a member variable

IV) Practice

Design a grade class
* C language Score (readable and writable)
* OC result (readable and writable)
* Total score (read only)
* Average score (read only)

Analysis: Readable and writable are both set and get methods to write

Read-only is write-only get method

Write your own code as follows

Dark Horse Programmer--oc Language Set method and get method