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Top Forums Shell Programming and Scripting AWK Merge Fields for Print Output Post 302141649 by bakunin on Sunday 21st of October 2007 09:26:40 AM
Old 10-21-2007
Quote:
Originally Posted by RacerX
Where did i go wrong?
You took what was meant as a code fragment for demonstration purposes and put it to work without trying to understand it. First off, you have the variables "field3" and "field4" nowhere assigned, so chances are they don't hold what they are supposed to hold.

Second, i just found a typo in the code, which you also haven't noticed:

output=sprintf("%s %s / %s:", output, field1, field2)

should of course be

output=sprintf("%s %s / %s:", output, field2, field3)

but as it was just to show you the mechanism you could write that completely different anyways. I didn't care if the 10 blanks i put in if the two fields were empty are really correct, maybe it's more or less. The whole purpose of the if()-statement is: "if the one field AND the other field is empty, we put blanks at the end of the output string, otherwise the content of the first field, then a slash, then the second field". THIS was, what the code tried to show you. The blanks are just there to maintain the column format of the output. Possible output should like:

Code:
field1="A" or empty
field2="B" or empty

... A/B ...  // fields non-empty - print them with a "/" in between
...    ...  // fields empty - print an equal amount of spaces

So, go over your code again, remove any output which is just "passed through" (all the fields which are just read and written without any modification) and analyze the output of the stripped-down program. Find out, where the program produces the desired results and where it doesn't. Change it accordingly. Only when you have solved the tricky parts put in the other fields again, one by one. Let the program run in the different stages of development to see if it still works the way you want it to work.

By making little steps instead of giant leaps between runs you can always isolate occurring problems as they are introduced. If you write 10 lines and they do what the should, then add another 5 lines and the program doesn't do what it should any more you will *know* already that the problem is within the 5 lines last written.

There is an old roman proverb, "divide et impera" (set apart and rule). The same is true for programming. Nobody is able to analyze, write or conceive huge amounts of code at once, make them into small portions and study one after the other.

It is like solving the problem "build a house": don't try to build a house, try to build a wall first, as a house hast four walls and a roof. Don't even try to build a wall, try to reduce building the wall to solving the problem "lay one brick onto the other" - now, *this* is a manageable problem, which is easily solved, so "build a wall" is a long succession of "lay one brick onto the other"-problems. From there, develop the next step, say "how to combine 2 walls to form an edge", etc., etc., until you have a "build a house"-program, which is now a large array of little solveable problems, which are solved separately.

bakunin
 

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Address(3pm)                                            User Contributed Perl Documentation                                           Address(3pm)

NAME
Palm::Address - Handler for Palm AddressBook databases SYNOPSIS
use Palm::Address; DESCRIPTION
The Address PDB handler is a helper class for the Palm::PDB package. It parses AddressBook databases. AppInfo block The AppInfo block begins with standard category support. See Palm::StdAppInfo for details. Other fields include: $pdb->{appinfo}{lastUniqueID} $pdb->{appinfo}{dirtyFields} I don't know what these are. $pdb->{appinfo}{fieldLabels}{name} $pdb->{appinfo}{fieldLabels}{firstName} $pdb->{appinfo}{fieldLabels}{company} $pdb->{appinfo}{fieldLabels}{phone1} $pdb->{appinfo}{fieldLabels}{phone2} $pdb->{appinfo}{fieldLabels}{phone3} $pdb->{appinfo}{fieldLabels}{phone4} $pdb->{appinfo}{fieldLabels}{phone5} $pdb->{appinfo}{fieldLabels}{phone6} $pdb->{appinfo}{fieldLabels}{phone7} $pdb->{appinfo}{fieldLabels}{phone8} $pdb->{appinfo}{fieldLabels}{address} $pdb->{appinfo}{fieldLabels}{city} $pdb->{appinfo}{fieldLabels}{state} $pdb->{appinfo}{fieldLabels}{zipCode} $pdb->{appinfo}{fieldLabels}{country} $pdb->{appinfo}{fieldLabels}{title} $pdb->{appinfo}{fieldLabels}{custom1} $pdb->{appinfo}{fieldLabels}{custom2} $pdb->{appinfo}{fieldLabels}{custom3} $pdb->{appinfo}{fieldLabels}{custom4} $pdb->{appinfo}{fieldLabels}{note} These are the names of the various fields in the address record. $pdb->{appinfo}{country} An integer: the code for the country for which these labels were designed. The country name is available as $Palm::Address::countries[$pdb->{appinfo}{country}]; $pdb->{appinfo}{misc} An integer. The least-significant bit is a flag that indicates whether the database should be sorted by company. The other bits are reserved. Sort block $pdb->{sort} This is a scalar, the raw data of the sort block. Records $record = $pdb->{records}[N]; $record->{fields}{name} $record->{fields}{firstName} $record->{fields}{company} $record->{fields}{phone1} $record->{fields}{phone2} $record->{fields}{phone3} $record->{fields}{phone4} $record->{fields}{phone5} $record->{fields}{address} $record->{fields}{city} $record->{fields}{state} $record->{fields}{zipCode} $record->{fields}{country} $record->{fields}{title} $record->{fields}{custom1} $record->{fields}{custom2} $record->{fields}{custom3} $record->{fields}{custom4} $record->{fields}{note} These are scalars, the values of the various address book fields. $record->{phoneLabel}{phone1} $record->{phoneLabel}{phone2} $record->{phoneLabel}{phone3} $record->{phoneLabel}{phone4} $record->{phoneLabel}{phone5} Most fields in an AddressBook record are straightforward: the "name" field always gives the person's last name. The "phoneN" fields, on the other hand, can mean different things in different records. There are five such fields in each record, each of which can take on one of eight different values: "Work", "Home", "Fax", "Other", "E-mail", "Main", "Pager" and "Mobile". The $record->{phoneLabel}{phone*} fields are integers. Each one is an index into @Palm::Address::phoneLabels, and indicates which particular type of phone number each of the $record->{phone*} fields represents. $record->{phoneLabel}{display} Like the phone* fields above, this is an index into @Palm::Address::phoneLabels. It indicates which of the phone* fields to display in the list view. $record->{phoneLabel}{reserved} I don't know what this is. METHODS
new $pdb = new Palm::Address; Create a new PDB, initialized with the various Palm::Address fields and an empty record list. Use this method if you're creating an Address PDB from scratch. new_Record $record = $pdb->new_Record; Creates a new Address record, with blank values for all of the fields. The AppInfo block will contain only an "Unfiled" category, with ID 0. "new_Record" does not add the new record to $pdb. For that, you want "$pdb->append_Record". SOURCE CONTROL
The source is in Github: http://github.com/briandfoy/p5-Palm/tree/master AUTHOR
Alessandro Zummo, "<a.zummo@towertech.it>" Currently maintained by brian d foy, "<bdfoy@cpan.org>" SEE ALSO
Palm::PDB(3) Palm::StdAppInfo(3) BUGS
The new() method initializes the AppInfo block with English labels and "United States" as the country. perl v5.10.1 2010-02-23 Address(3pm)
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