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Here s what Brad said about his revision I realized that I had already used examples; for instance, when I listed where Georgia is lower risk and in mentioning the potential problems in Florida All I did was add a few numbers and rewrote some sentences to highlight the data Step-by-step, Brad s report is getting better How about your draft Can you see that it, too, is better

// Using checked and unchecked using System; class CheckedDemo { static void Main() { byte a, b;

2 44 8 = 3 3

13:

byte result; a = 127; b = 127; try { result = unchecked((byte)(a * b)); ConsoleWriteLine("Unchecked result: " + result); result = checked((byte)(a * b)); // this causes exception ConsoleWriteLine("Checked result: " + result); // won't execute } catch (OverflowException exc) { ConsoleWriteLine(exc); } } }

The output from the program is shown here:

Unchecked result: 1 SystemOverflowException: Arithmetic operation resulted in an overflow at CheckedDemoMain()

1 1 3 4

As is evident, the unchecked expression resulted in a truncation The checked expression caused an exception The preceding program demonstrated the use of checked and unchecked for a single expression The following program shows how to check and uncheck a block of statements

// Using checked and unchecked with statement blocks using System; class CheckedBlocks { static void Main() { byte a, b; byte result; a = 127; b = 127; try { unchecked { a = 127; b = 127; result = unchecked((byte)(a * b)); ConsoleWriteLine("Unchecked result: " + result); a = 125; b = 5; result = unchecked((byte)(a * b)); ConsoleWriteLine("Unchecked result: " + result); }

Part I:

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As you reread your draft, think about the actual words you use Aim to select words that satisfy the principle of FURY You ll recall that the principle of FURY recommends that you choose words that are familiar to your readers, unless the word in question is a unique term (such as industry jargon), rich, or your favorite

checked { a = 2; b = 7; result = checked((byte)(a * b)); // this is OK ConsoleWriteLine("Checked result: " + result); a = 127; b = 127; result = checked((byte)(a * b)); // this causes exception ConsoleWriteLine("Checked result: " + result); // won't execute } } catch (OverflowException exc) { ConsoleWriteLine(exc); } } }

The output from the program is shown here:

Unchecked result: 1 Unchecked result: 113 Checked result: 14 SystemOverflowException: Arithmetic operation resulted in an overflow at CheckedBlocksMain()

As you can see, the unchecked block results in the overflow being truncated When overflow occurred in the checked block, an exception was raised One reason that you may need to use checked or unchecked is that the default checked/unchecked status of overflow is determined by the setting of a compiler option and the execution environment, itself Thus, for some types of programs, it is best to specify the overflow check status explicitly

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he earlier chapters of this book have used parts of the C# I/O system, such as ConsoleWriteLine( ), but have done so without much formal explanation Because the I/O system is built upon a hierarchy of classes, it was not possible to present its theory and details without first discussing classes, inheritance, and exceptions Now it is time to examine I/O in detail Because C# uses the I/O system and classes defined by the NET Framework, a discussion of I/O under C# is also a discussion of the NET I/O system, in general This chapter examines both console I/O and file I/O Be forewarned that the I/O system is quite large This chapter describes the most important and commonly used features

C# programs perform I/O through streams A stream is an abstraction that either produces or consumes information A stream is linked to a physical device by the I/O system All streams behave in the same manner, even if the actual physical devices they are linked to differ Thus, the I/O classes and methods can be applied to many types of devices For example, the same methods that you use to write to the console can also be used to write to a disk file