C# 0 The Complete Reference

Using Length with Jagged Arrays

A special case occurs when 

Length

 is used with jagged arrays. In this situation, it is possible 

to obtain the length of each individual array. For example, consider the following program, 

which simulates the CPU activity on a network with four nodes:

// Demonstrate Length with jagged arrays.

using System;

class Jagged {

  static void Main() {

    int[][] network_nodes = new int[4][];

    network_nodes[0] = new int[3];

    network_nodes[1] = new int[7];

    network_nodes[2] = new int[2];

    network_nodes[3] = new int[5];

    int i, j;

    // Fabricate some fake CPU usage data.

    for(i=0; i < network_nodes.Length; i++)

      for(j=0; j < network_nodes[i].Length; j++)

        network_nodes[i][j] = i * j + 70;

    Console.WriteLine("Total number of network nodes: " +

                      network_nodes.Length + "\n");

    for(i=0; i < network_nodes.Length; i++) {

      for(j=0; j < network_nodes[i].Length; j++) {

        Console.Write("CPU usage at node " + i +

                      " CPU " + j + ": ");

        Console.Write(network_nodes[i][j] + "% ");

        Console.WriteLine();

      }

      Console.WriteLine();

    }

  }

}

The output is shown here:

Total number of network nodes: 4

CPU usage at node 0 CPU 0: 70%

CPU usage at node 0 CPU 1: 70%

CPU usage at node 0 CPU 2: 70%

CPU usage at node 1 CPU 0: 70%

CPU usage at node 1 CPU 1: 71%

CPU usage at node 1 CPU 2: 72%

CPU usage at node 1 CPU 3: 73%

CPU usage at node 1 CPU 4: 74%

www.freepdf-books.com

---