C# 0 The Complete Reference

PART II

C h a p t e r   2 1 :  

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639

  static void Main() {

    string str = "This is a test. $23";

    int i;

    for(i=0; i < str.Length; i++) {

      Console.Write(str[i] + " is");

      if(Char.IsDigit(str[i]))

        Console.Write(" digit");

      if(Char.IsLetter(str[i]))

        Console.Write(" letter");

      if(Char.IsLower(str[i]))

        Console.Write(" lowercase");

      if(Char.IsUpper(str[i]))

        Console.Write(" uppercase");

      if(Char.IsSymbol(str[i]))

        Console.Write(" symbol");

      if(Char.IsSeparator(str[i]))

        Console.Write(" separator");

      if(Char.IsWhiteSpace(str[i]))

        Console.Write(" whitespace");

      if(Char.IsPunctuation(str[i]))

        Console.Write(" punctuation");

      Console.WriteLine();

    }

    Console.WriteLine("Original: " + str);

    // Convert to uppercase.

    string newstr = "";

    for(i=0; i < str.Length; i++)

      newstr += Char.ToUpper(str[i]);

    Console.WriteLine("Uppercased: " + newstr);

  }

}

The output is shown here:

T is letter uppercase

h is letter lowercase

i is letter lowercase

s is letter lowercase

  is separator whitespace

i is letter lowercase

s is letter lowercase

  is separator whitespace

a is letter lowercase

  is separator whitespace

t is letter lowercase

e is letter lowercase

s is letter lowercase

t is letter lowercase

. is punctuation

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640

 

P a r t   I I :  

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  is separator whitespace

$ is symbol

2 is digit

3 is digit

Original: This is a test. $23

Uppercased: THIS IS A TEST. $23