C# 0 The Complete Reference

str4

 with the string “OneTwoThree”.

One other point: The 

string

 keyword is an 

alias

for (that is, maps directly to) the 

System.String

 class defined by the .NET Framework class library. Thus, the fields and 

methods defined by 

string

 are those of the 

System.String

 class, which includes more 

than the sampling described here. 

System.String

 is examined in detail in Part II.

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Arrays of Strings

Like any other data type, strings can be assembled into arrays. For example:

// Demonstrate string arrays.

using System;

class StringArrays {

  static void Main() {

    string[] str = { "This", "is", "a", "test." };

    Console.WriteLine("Original array: ");

    for(int i=0; i < str.Length; i++)

      Console.Write(str[i] + " ");

    Console.WriteLine("\n");

    // Change a string.

    str[1] = "was";

    str[3] = "test, too!";

    Console.WriteLine("Modified array: ");

    for(int i=0; i < str.Length; i++)

      Console.Write(str[i] + " ");

  }

}

Here is the output from this program:

Original array:

This is a test.

Modified array:

This was a test, too!

Here is a more interesting example. The following program displays an integer value 

using words. For example, the value 19 will display as “one nine”.

// Display the digits of an integer using words.

using System;

class ConvertDigitsToWords {

  static void Main() {

    int num;

    int nextdigit;

    int numdigits;

    int[] n = new int[20];

    string[] digits = { "zero", "one", "two",

                        "three", "four", "five",

                        "six", "seven", "eight",

                        "nine" };

    num = 1908;

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