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importance of choosing the right technique, is found in 22, where string handling is discussed in detail Also notice the two methods ToUpper( ) and ToLower( ), which uppercase or lowercase a string, respectively The forms shown here both have a CultureInfo parameter This is a class that describes the cultural attributes to use for the conversion The examples in this book use the current culture settings These settings are specified by passing CultureInfoCurrentCulture The CultureInfo class is in SystemGlobalization As a point of interest, there are versions of these methods that use the current culture by default, but to avoid ambiguity on this point, this book will explicitly specify this argument The string type also includes the Length property, which contains the length of the string

static int Compare(string strA, string strB, StringComparison comparisonType)

Returns less than zero if strA is less than strB, greater than zero if strA is greater than strB, and zero if the strings are equal How the comparison is conducted is specified by comparisonType Returns true if the invoking string is the same as value How the comparison is conducted is specified by comparisonType Searches the invoking string for the first occurrence of the character specified by value An ordinal search is used Returns the index of the first match, or 1 on failure Searches the invoking string for the first occurrence of the substring specified by value How the search is conducted is specified by comparisonType Returns the index of the first match, or 1 on failure Searches the invoking string for the last occurrence of the character specified by value An ordinal search is used Returns the index of the first match, or 1 on failure Searches the invoking string for the last occurrence of the substring specified by value How the search is conducted is specified by comparisonType Returns the index of the last match, or 1 on failure Returns a lowercase version of the invoking string How the conversion is performed is specified by culture Returns an uppercase version of the invoking string How the conversion is performed is specified by culture

bool Equals(string value, StringComparison comparisonType) int IndexOf(char value)

less/fewer Fewer, used with plural nouns, refers to number Less, used with singular nouns, refers to degree or amount Both fewer and number end in er, which can help you remember which word to use Part of the confusion results from the commonly seen sign in grocery stores: ten items or less It should read: ten items or fewer

6 3 3 6 x

int IndexOf(string value, StringComparison comparisonType)

int LastIndexOf(char value)

int LastIndexOf(string value, StringComparison comparisonType)

When we first learn trigonometry, we do so by studying right triangles and measuring angles in degrees Look at Figure 125 In calculus, however, it is convenient to study trigonometry in a more general setting, and to measure angles in radians

string ToLower( CultureInfoCurrentCulture culture) string ToUpper( CultureInfoCurrentCulture culture)

TABLE 7-1

7:

To obtain the value of an individual character of a string, you simply use an index For example:

Angles will be measured by rotation along the unit circle in the plane, beginning at the positive x-axis See Figure 126 Counterclockwise rotation corresponds to positive angles, and clockwise rotation corresponds to negative angles Refer to Figure 127 The radian measure of an angle is defined as the length of the arc of the unit circle that the angle subtends with the positive x-axis (together with an appropriate + or sign) In degree measure, one full rotation about the unit circle is 360 ; in radian measure, one full rotation about the circle is just the circumference of the circle or 2 Let us use the symbol to denote an angle The principle of proportionality now tells us that radian measure of degree measure of = 360 2

string str = "test"; ConsoleWriteLine(str[0]);