Indexers don't have to operate on actual arrays : Indexer « Class Interface « C# / C Sharp

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Indexers don't have to operate on actual arrays
Indexers don't have to operate on actual arrays

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/

// Indexers don't have to operate on actual arrays. 
 
using System; 
 
class PwrOfTwo {  
 
  /* Access a logical array that contains 
     the powers of 2 from 0 to 15. */ 
  public int this[int index] { 
    // Compute and return power of 2. 
    get 
      if((index >= 0&& (index < 16)) return pwr(index)
      else return -1
    
 
    // there is no set accessor 
  
 
  int pwr(int p) { 
    int result = 1
 
    for(int i=0; i<p; i++
      result *= 2
     
    return result; 
  
}  
  
public class UsePwrOfTwo {  
  public static void Main() {  
    PwrOfTwo pwr = new PwrOfTwo()
 
    Console.Write("First 8 powers of 2: ")
    for(int i=0; i < 8; i++
      Console.Write(pwr[i" ")
    Console.WriteLine()
 
    Console.Write("Here are some errors: ")
    Console.Write(pwr[-1" " + pwr[17])
 
    Console.WriteLine()
  
}


           
       
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