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The last program in this chapter, slasher, demonstrates several different backslash combinations. A backslash combination combines a backslash character (\) and a second character to produce a specific result when the combination is printed in the console window. One backslash combination you ve seen a lot of in this book is \n, which produces a new line in the console. C allows you to embed any number of backslash combinations in a text string. For example, this line of code:

printf( "Hello\n\nGoodbye" );

Step 2 Access the Power Options applet in the Control Panel, and make a note of your current power management settings Check out the different power schemes available (this will depend on your speci c system) and experiment with changing the settings to see how this affects when the monitor and hard drives turn off Each of these schemes has adjustable times The tabs and settings will differ depending on which version of Windows you re running Be sure to look at them all To see more detailed power scheme settings in Windows Vista, be sure to click Change power settings and then Change advanced power settings

.

produces the following output in the console window:

The single blank line between Hello and Goodbye was caused by the two \n characters. The first \n would have caused the console to put Goodbye on the line immediately below Hello. The second \n moved the Goodbye down one more line. There are a number of backslash combinations. Let s discuss a few of the most interesting ones:

If you simply embedded a backslash character in your string, the compiler would attempt to combine the backslash with the very next character, producing some unpredictable results. Unpredictable is bad.

The Windows XP Power Options Properties dialog box (on a notebook) has ve tabs: Power Schemes, Alarms, Power Meter, Advanced, and Hibernate (see Figure 14-1) You can use the Alarms tab to set the time when the battery alarm is activated The Power Meter tab shows the percent of charge remaining in the battery

a double-quote character in your code, it assumes you are starting a text string. It keeps reading, reading, reading, until it encounters a second, matching doublequote character. The second quote tells the compiler that it has reached the end of the string. So how do you place a quote character inside a string without ending the string Easy. Use the \" where you want the quote to appear.

Backslash combinations stem from the olden days, where all programs ran on video displays with a fixed number of rows and columns. The backslash combinations helped programmers overcome the limitations of these displays, giving them a bit more control. As computers evolved, many of these backslash combinations became unnecessary. Over time, many development environments stopped supporting all but the most basic of these. To see this yourself, we ll run our next program, slasher, using the Terminal application that you used in 4. The Terminal application implements a classic console window that supports all the well-known backslash combinations, just like an old video display terminal. We ll use the built in Unix tools that you installed when you installed Xcode at the beginning of the book to compile the program as well.