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The eval function provides a very simple way of checking certain events without affecting the overall execution of your script In essence, the eval function just initiates a new instance of the Perl interpreter in order to evaluate a particular string or block It s used in all sorts of places within Perl including in the debugger where it allows you to execute those arbitrary statements but it can also be employed as a debugging tool Because eval evaluates a Perl statement or block within its own interpreter, we can use it in situations that might otherwise cause the Perl interpreter to fail This process works because an embedded eval block reports any errors raised by a call to die through the $@ variable In fact, any exit is reported through eval to the $@ special variable We can demonstrate this with a simple eval block used to test the existence of a particular module:

Follow these steps to record the batch input: 1 2 3 4 5 Record the batch input Export the batch-input-recording format to a text file Create the data to be used in the batch input Merge the format with the data Upload the merged file The data is now in the format that the batch input requires After uploading the recording with the data, you can run the batch input

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eval { require Net::FTP; } print "Error: Module failed to load ($@)" if $@;

This outputs the following:

4 While the yellow marker is present, pick a point AutoCAD snaps to the circle s center 5 For the next endpoint, use polar coordinates to extend the line 24 up and to the right at a 70 angle

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$ perl evalpl Failed to load Net::FTP: Can't locate Net/LICKpm in @INC (@INC contains: /usr/local/lib/perl5/560/i686-linux /usr/local/lib/perl5/560 /usr/local/lib/perl5/site_perl/560/i686-linux /usr/local/lib/perl5/site_perl/560 /usr/local/lib/perl5/site_perl ) at evalpl line 1

Armed with this information, we can now check anything (except statements executed at compile time, such as use) that might raise an error, and we can trap and report the problem The same operation can be followed for simpler statements, such as for checking a possible divide-by-zero error You could do this:

Next, we are going to draw the horizontal line using AutoCAD s object snap tracking feature 1 Reenter the LINE command and move the crosshairs to the second endpoint of the line until the Endpoint object snap marker appears The purpose of doing this is to acquire the Endpoint object snap When you acquire an object snap, a small yellow + (plus sign) appears at the snap point An acquired object snap also displays a small white x near the crosshairs To remove an acquired object snap, pass over the snap point a second time 2 Slowly move the crosshairs around the endpoint and notice the temporary alignment paths that appear As you may recall, alignment paths are temporary lines that display at speci c angles from an acquired object snap Object snap tracking is active when the alignment paths appear from one or more acquired object snaps This feature is a part of AutoCAD s AutoTrack You can toggle AutoTrack on and off with the Polar Tracking and Object Snap Tracking buttons on the status bar Because object snap tracking works in conjunction with object snaps, one or more object snaps must be set before you can track from an object s snap point 3 Move the crosshairs down the line that you created earlier so that a small x appears on the line 4 Enter 3 This starts a new line 3 from the endpoint of the rst line 5 Draw a horizontal line segment 24 to the right

if ($b == 0) { print "Can't divide by zero\n"; } else { print "Result is ", $a/$b,"\n"; }

21:

But it s slightly more convenient to do this:

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To record the batch input, use the menu path: System, Services, Batch input, Edit Then hit the Recording button (or select Goto, Recording from the menu) Alternatively, you can use Transaction code [SHDB] The following screen then appears, as shown in Figure 5-25

eval { $a/$b }; print $@ if $@;

Here s another example, this time of a function that uses an eval to execute its statements so that it can return a single error back to the caller instead of simply calling die and executing the script completely:

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