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// Demonstrate casting using System; class CastDemo { static void Main() { double x, y; byte b; int i; char ch; uint u; short s; long l; x = 100; y = 30; // Cast double to int, fractional component lost i = (int) (x / y); ConsoleWriteLine("Integer outcome of x / y: " + i); ConsoleWriteLine(); // Cast an int into a byte, no data lost i = 255; b = (byte) i; ConsoleWriteLine("b after assigning 255: " + b + " -- no data lost"); // Cast an int into a byte, data lost i = 257; b = (byte) i; ConsoleWriteLine("b after assigning 257: " + b + " -- data lost"); ConsoleWriteLine(); // Cast a uint into a short, no data lost u = 32000; s = (short) u; ConsoleWriteLine("s after assigning 32000: " + s + " -- no data lost"); // Cast a uint into a short, data lost u = 64000; s = (short) u; ConsoleWriteLine("s after assigning 64000: " + s + " -- data lost"); ConsoleWriteLine();

Here is a sample run:

notation It says that S is the set of all numbers x such that x is greater than or equal to 8 and less than 5 We will use set builder notation throughout the book

Next is an example that uses the Pow( ) method to compute the initial investment required to achieve a desired future value given the annual rate of return and the number of years The formula to compute the initial investment is shown here: InitialInvestment = FutureValue / (1 + InterestRate)Years Because Pow( ) requires double arguments, the interest rate and the number of years are held in double values The future value and initial investment use the decimal type

/* Compute the initial investment needed to attain a known future value given annual rate of return and the time period in years */ using System; class InitialInvestment { static void Main() { decimal initInvest; // initial investment decimal futVal; // future value

Part II:

If an interval contains both its endpoints, then it is called a closed interval If an interval omits both its endpoints, then it is called a open interval See Figure 13

double numYears; double intRate; string str;

In the last chapter, we discussed the importance of using a methodical process in writing You learned to set objectives, analyze your audience, and determine how formal a tone you should adopt In this chapter, we re going to compare and contrast nine organizational structures, consider visual writing techniques, review traditional outlining, and discuss an alternative to traditional outlining called Hub & Spokes

ConsoleWrite("Enter future value: "); str = ConsoleReadLine(); try { futVal = DecimalParse(str); } catch(FormatException exc) { ConsoleWriteLine(excMessage); return; } ConsoleWrite("Enter interest rate (such as 0085): "); str = ConsoleReadLine(); try { intRate = DoubleParse(str); } catch(FormatException exc) { ConsoleWriteLine(excMessage); return; } ConsoleWrite("Enter number of years: "); str = ConsoleReadLine(); try { numYears = DoubleParse(str); } catch(FormatException exc) { ConsoleWriteLine(excMessage); return; } initInvest = futVal / (decimal) MathPow(intRate+10, numYears); ConsoleWriteLine("Initial investment required: {0:C}", initInvest); } }

Here is a sample run:

Enter future value: 10000 Enter interest rate (such as 0085): 007 Enter number of years: 10 Initial investment required: $5,08349

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The structures that correspond to C# s built-in value types were introduced in 14 when they were used to convert strings holding human-readable numeric values into their equivalent binary values Here these structures are examined in detail

21:

The NET structure names and their C# keyword equivalents are shown in the following table:

We solve the inequality to obtain x < 6 The set of points satisfying this inequality is exhibited in Figure 14

NET Structure Name SystemBoolean SystemChar SystemDecimal SystemDouble SystemSingle SystemInt16 SystemInt32 SystemInt64 SystemUInt16 SystemUInt32 SystemUInt64 SystemByte SystemSbyte C# Name bool char decimal double float

By using the members defined by these structures, you can perform operations relating to the value types The following sections examine each of these structures

Selecting an organizational structure before you begin to write makes the actual writing process easier and more straightforward If you recognize that you have several separate issues that need to be addressed, you might decide to use the category structure Having made that decision, the next step is clear: identify your categories On the other hand, if you decide to write using a chronology structure, you won t list categories; instead, you ll start at the beginning and continue on sequentially As you review the nine organizational structures on the next page, consider the versatility and limitations of each, and note that no one organizational structure is better than another The sections that follow are intended to help you understand how to make a decision about which organizational structure is appropriate for your project