Csharp/CSharp Tutorial/Class/protected

Demonstrate protected.

1. A protected member is public within a class hierarchy, but private outside that hierarchy.
2. A protected member is created by using the protected access modifier.

<source lang="csharp">using System;

class BaseClass {

 protected int i, j; // private to BaseClass, but accessible by D 

 public void set(int a, int b) { 
   i = a; 
   j = b; 
 } 

 public void show() { 
   Console.WriteLine(i + " " + j); 
} 

}

class DerivedClass : BaseClass {

 int k; // private 

 // DerivedClass can access BaseClass"s i and j 
 public void setk() { 
    k = i * j; 
 } 

 public void showk() { 
   Console.WriteLine(k); 
 } 

}

class MainClass {

 public static void Main() { 
   DerivedClass ob = new DerivedClass(); 

   ob.set(2, 3); // OK, known to DerivedClass 
   ob.show();    // OK, known to DerivedClass 

   ob.setk();  // OK, part of DerivedClass 
   ob.showk(); // OK, part of DerivedClass 
 } 

}</source>

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