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You can obtain a portion of a string by using the Substring( ) method It has these two forms: public string Substring(int startIndex) public string Substring(int startIndex, int length) In the first form, the substring begins at the index specified by startIndex and runs to the end of the invoking string In the second form, the substring begins at startIndex and runs for length characters In each case, the substring is returned The following program demonstrates the Substring( ) method:

I have reviewed your letter of complaint explaining the dif culties you had in registering your company s representatives for the National Widget Conference and Trade Show on our website (twenty-nine words)

// Use Substring() using System;

22:

Calculate the integrals:

class SubstringDemo { static void Main() { string str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; ConsoleWriteLine("str: " + str); ConsoleWrite("strSubstring(15): "); string substr = strSubstring(15); ConsoleWriteLine(substr); ConsoleWrite("strSubstring(0, 15): "); substr = strSubstring(0, 15); ConsoleWriteLine(substr); } }

The following output is produced:

As mentioned earlier, String implements IEnumerable<T> This means that beginning with C# 30, a String object can call the extension methods defined by Enumerable and Queryable, which are both in the SystemLinq namespace These extension methods primarily provide support for LINQ, but some can also be used for other purposes, such as certain types of string handling See 19 for a discussion of extension methods

We have exp( 5x) dx = [exp( x) ]3 dx = = 1 2 1 exp( 5x) + C 5 [exp( x) ] [exp( x) ] [exp( x) ] dx exp( 3x) dx = 1 exp( 3x) + C 3 1 exp( 2x + 7) + C 2

When a human-readable form of a built-in type, such as int or double, is needed, a string representation must be created Although C# automatically supplies a default format for this representation, it is also possible to specify a format of your own choosing For example, as you saw in Part I, it is possible to output numeric data using a dollars and cents format A number of methods format data, including ConsoleWriteLine( ), StringFormat( ), and the ToString( ) method defined for the numeric structure types The same approach to formatting is used by all three; once you have learned to format data for one, you can apply it to the others

Formatting is governed by two components: format specifiers and format providers The form that the string representation of a value will take is controlled through the use of a format specifier Thus, it is the format specifier that dictates how the human-readable form of the data will look For example, to output a numeric value using scientific notation, you will use the E format specifier In many cases, the precise format of a value will be affected by the culture and language in which the program is running For example, in the United States, money is represented

Part II:

There s no one best place to end the sentence It s your choice Once you ve made your decision, you can easily revise the remaining phrase so it also becomes a complete sentence For example, you might write:

.

For clarity, we let ( x) = exp( cos3 x) , ( x) = 3 cos2 x ( sin x) Then the integral becomes 1 3 exp( ( x) ) ( x) dx = 1 exp( ( x) ) + C 3