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example, a spreadsheet application takes the numbers you type into it, inserts them into cells, and possibly performs calculations such as adding columns, an OS takes your commands in the form of mouse clicks, joysticks, touch screens, or keyboard input-commands such as show a listing of the files in this directory and performs the request, such as printing to the screen a list of files. You can also ask the OS to launch a particular application say, a text editor. You then tell the text editor to open a file. Behind the scenes, the editor actually asks the OS to find the file and make its contents available to the editor. Virtually all computers built today include some form of protection courtesy of the OS. Let s take a look at how such protection works.

The basic philosophy of debugging a program is composed of a few steps First, you need to isolate the general area of the code where the fault is occurring Next you need to determine why that portion of the code is not performing as expected (locating the speci c source of the problem) Finally, you have to correct the faulty lines or logic that causes the problem Let s see how each of these can be accomplished 631 ISOLATING THE FAULT Assume you have a 200-line program that stalls or hangs when it is run It would be inef cient to look through the entire program hoping to nd the problem Often the reason a program hangs is because it is stuck in a loop, doing the same thing over and over but appearing to be doing nothing at all to the observer.

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Virtually all operating systems have some built-in permissions, which allow only certain people access to the computer (its hard drive, memory, disk space, and network connection). Such access is implemented via a login procedure. If the user does not present the appropriate credentials (perhaps a user name and password), the OS will not allow that individual to use the computer. But even after a user is logged in, certain files may still be off-limits. If someone asks to see a file, the OS checks to see whether that requester is on the list of approved users; if not, the OS does not disclose the contents (see Figure 1-1). Access to most business computers and networks is controlled by someone known as a superuser or system administrator (often shortened to sys admin). This system administrator is the person charged with creating and closing user accounts and maintaining the systems and network. A typical task of this superuser account is to override protections. Someone forgot a password A file is read-protected (meaning that it cannot be opened and read) The superuser has permission to circumvent the OS permissions to respond to these problems. (This is where the name superuser comes from; this individual can do anything.) How does the OS know that the person requesting such system overrides is the superuser The OS grants this access by user name and password. The superuser user name is usually su or root or administrator. Unfortunately, techniques for circumventing these default defenses are widely known.

Find north using a standard compass. Rotate the circuit so that one LED is lit. I used the LED furthest away from the sensor for north. If you do the same, the other LEDs will automatically follow the same sequence outlined (see Fig. 5.31). The sequence for my display is as follows: 1 on, 0 off.

This means you have already narrowed the problem down to code that lies within a loop For example, let s assume there are four major loops in the program Our next goal would be to determine if one of these loops contains the problem and if so, which one An easy way to do this would be to place some Print-statements before and after each loop These would display something like Entering loop 1 or Exiting loop 3 so that when the program is run, you will be able to see how the program is progressing This procedure should allow you to determine which loop contains the problem If your program is very large, perhaps containing dozens of loops, you could place similar print statements at the beginning and ending of subroutines to initially isolate the problem to a portion of your code.

Figure 1-1

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