Swap two references : Parameters Passing « Language Basics « C# / C Sharp

Swap two references

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Swap two references. 
 
using System; 
 
class RefSwap { 
  int a, b; 
   
  public RefSwap(int i, int j) { 
    a = i; 
    b = j; 
  } 
 
  public void show() { 
    Console.WriteLine("a: {0}, b: {1}", a, b); 
  } 
 
  // This method now changes its arguments. 
  public void swap(ref RefSwap ob1, ref RefSwap ob2) { 
    RefSwap t; 
  
    t = ob1; 
    ob1 = ob2; 
    ob2 = t; 
  } 
} 
 
public class RefSwapDemo { 
  public static void Main() { 
    RefSwap x = new RefSwap(1, 2); 
    RefSwap y = new RefSwap(3, 4); 
 
    Console.Write("x before call: "); 
    x.show(); 
 
    Console.Write("y before call: "); 
    y.show(); 
 
    Console.WriteLine(); 
 
    // exchange the objects to which x and y refer 
    x.swap(ref x, ref y);  
 
    Console.Write("x after call: "); 
    x.show(); 
 
    Console.Write("y after call: "); 
    y.show(); 
 
  } 
}

1.	Parameter out and reference
2.	Passing Parameters By Value and By Ref
3.	Objects can be passed to methods
4.	Simple types are passed by value
5.	Objects are passed by reference
6.	Use ref to pass a value type by reference
7.	Swap two values
8.	Use out
9.	Use two out parameters
10.	Demonstrate params
11.	Use regular parameter with a params parameter
12.	Parameter demo
13.	Passing parameters by reference
14.	Passing parameters by value
15.	Illustrates the use of out parameters
16.	Pass value by reference
17.	Pass value by reference with read only value
18.	Ref and Out Parameters: compiling error
19.	C# Ref and Out Parameters
20.	Ref and Out Parameters 2

Swap two references : Parameters Passing « Language Basics « C# / C Sharp

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