Parameter out and reference : Parameters Passing « Language Basics « C# / C Sharp

1. C# / C Sharp
2. Language Basics
3. Parameters Passing

Parameter out and reference

using System;  


class ReferenceAndOutputParamtersTest
{
   static void Main( string[] args )
   {

      int y = 5;
      int z; 

      Console.WriteLine( "Original value of y: {0}", y );
      Console.WriteLine( "Original value of z: uninitialized\n" );

      SquareRef( ref y ); // must use keyword ref
      SquareOut( out z ); // must use keyword out

      Console.WriteLine( "Value of y after SquareRef: {0}", y );
      Console.WriteLine( "Value of z after SquareOut: {0}\n", z );

      Square( y );
      Square( z );

      Console.WriteLine( "Value of y after Square: {0}", y );
      Console.WriteLine( "Value of z after Square: {0}", z );

   } 
   static void SquareRef( ref int x )
   {
      x = x * x;
   }

   static void SquareOut( out int x )
   {
      x = 6;
      x = x * x;
   } 

   static void Square( int x )
   {
      x = x * x;
   } 

}
           
       

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