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The structure corresponding to the char type is Char It is quite useful because it supplies a large number of methods that allow you to process and categorize characters For example, you can convert a lowercase character to uppercase by calling ToUpper( ) You can determine if a character is a digit by calling IsDigit( ) The methods defined by Char are shown in Table 21-9 Notice that several, such as ConvertFromUtf32( ) and ConvertToUtf32( ), give you the ability to work with both UTF-16 and UTF-32 Unicode characters In the past, all Unicode characters could be represented by 16 bits, which is the size of a char However, a few years ago the Unicode character set was expanded and more than 16 bits are required Each Unicode character is represented by a code point The way that a code point is encoded depends on the Unicode Transformation Format (UTF) being used In UTF-16, the most common code points require one 16-bit value, but some need two 16-bit values When two 16-bit values are needed, two char values are used to represent it The first character is called the high surrogate and the second is called the low surrogate In UTF-32, each code point uses one 32-bit value Char provides the necessary conversions between UTF-16 and UTF-32 One other point about the Char methods The default forms of ToUpper( ) and ToLower( ) use the current cultural settings to determine how to upper- or lowercase a character At the time of this writing, the recommended style is to explicitly specify the cultural setting by using a second form of these methods that has a CultureInfo parameter CultureInfo is in SystemGlobalization You can pass the property CultureInfoCurrentCulture to specify the current culture Char defines the following fields: public const char MaxValue public const char MinValue These represent the largest and smallest values that a char variable can hold Char implements the following interfaces: IComparable, IComparable<char>, IConvertible, and IEquatable<char>.

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Part II:

Method public int CompareTo(char value)

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What s your assessment of Amanda s revision Is complete a better choice than ll out How about conduct instead of do Is consult stronger than read Notice that Amanda s original words were ne; most people, however, think that her revision is better EXERCISE 15: Revise in a Methodical Manner In the following rst draft of an E-mail to retail sales staff, Les, the merchandising manager of a one-hour eyeglasses store chain, wants to institute a policy that the in-store sales staff shouldn t leave eyeglass frames scattered on the counter Les explained that he struggled with how to word the E-mail I didn t want to issue an edict, he explained I wanted to position it as a sales strategy Read Les s first draft, answer the questions, and then revise the E-mail, addressing the issues raised

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Meaning Compares the character in the invoking object with that of value Returns zero if the characters are equal Returns a negative value if the invoking object has a lower value Returns a positive value if the invoking object has a greater value Compares the character in the invoking object with that of value Returns zero if the characters are equal Returns a negative value if the invoking object has a lower value Returns a positive value if the invoking object has a greater value Converts the Unicode UTF-32 code point in utf32 into a UTF-16 string and returns the result Converts the high and low UTF-16 surrogates specified by highSurrogate and lowSurrogate into a UTF-32 codepoint The result is returned Converts the UTF-16 character or surrogate pair at s[index] into its UTF-32 code point The result is returned Returns true if the value of the invoking object equals the value of obj Returns true if the value of the invoking object equals the value of obj Returns the hash code for the invoking object Returns the numeric value of c if c is a digit Otherwise, returns 1 Returns the numeric value of s[index] if that character is a digit Otherwise, returns 1 Returns the TypeCode enumeration value for Char, which is TypeCodeChar Returns the UnicodeCategory enumeration value for c UnicodeCategory is an enumeration defined by SystemGlobalization that categorizes Unicode characters Returns the UnicodeCategory enumeration value for s[index] UnicodeCategory is an enumeration defined by SystemGlobalization that categorizes Unicode characters Returns true if c is a control character Otherwise, returns false Returns true if s[index] is a control character Otherwise, returns false Returns true if c is a digit Otherwise, returns false Returns true if s[index] is a digit Otherwise, returns false Returns true if c is a valid high surrogate Otherwise, returns false Returns true if s[index] is a valid high surrogate Otherwise, returns false.

public int CompareTo(object value)