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Word-Length-3 is a shining example of indirection. Rather than coding the words directly into your program, you re instead saying, Go look in /tmp/words.txt to get the words. With this scheme, we can change the set of words anytime we want, just by editing this text file, without having to change the program. Go ahead and try it out: add a couple of words to your words.txt file and rerun the program. We ll wait for you here. This approach is better, because text files are easier to edit and far less fragile than source code. You can get your nonprogrammer friends to use TextEdit to do the editing. Your marketing staff can keep the list of words up to date, which frees you to work on more interesting tasks. As you know, people always come along with new ideas for upgrading or enhancing a program. Maybe your investors have decided that counting the length of cooking terms is the new path to profit. Now that your program looks at a file for its data, you can change the set of words all you want without ever having to touch the code. Despite great advances in indirection, Word-Length-3 is still rather fragile, because it insists on using a full path name to the words file. And that file itself is in a precarious position: if the computer reboots, /tmp/words.txt vanishes. Also, if others are using the program on your machine with their own /tmp/words.txt file, they could accidentally stomp on your copy. You could edit the program each time to use a different path, but we already know that that s no fun, so let s add another indirection trick to make our lives easier.

1 Open the ThreeViewNavCont project in Xcode 2 Open SecondViewController and add an IBOutlet for a UIBarButtonItem to

You ll get more out of How to Value Your Business and Increase Its Potential if you: (1) create an extra set of copies of the tables, (2) print and read the supplemental chapters on my Web site, (3) look for updates, and (4) make sure you understand the vocabulary, which can be confusing I ll briefly go into these four points For your own enrichment, you can download relevant material to supplement the 15 chapters, which I ll explain below

SecondViewController as a property Name the property navBut; don t forget to synthesize the property in SecondViewControllerm

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Instead of looking in /tmp/words.txt to get the words, we ll change the program and tell it to go look at the first launch parameter of the program to figure out the location of the words file. Here is the Word-Length-4 program (which can be found in the 03.07 Word-Length-4 folder). It uses a command-line parameter to specify the file name. The changes we made to Word-Length-3 are highlighted:

navigationItem s right bar button item to navBut:

#import <Foundation/Foundation.h> int main (int argc, const char * argv[]) { if (argc == 1) { NSLog (@"you need to provide a file name"); return (1); } FILE *wordFile = fopen (argv[1], "r"); char word[100]; while (fgets(word, 100, wordFile)) { // strip off the trailing \n word[strlen(word) - 1] = \0 ; NSLog (@"%s is %d characters long", word, strlen(word)); } fclose (wordFile); return (0); } // main

It is very important to understand the tables in Part One The explanation of the tables often spans two or more pages and often does not appear on the same page as the table In order to make them easier to understand, I ve made the tables available in Adobe Acrobat format (pdf) on at wwwabramsvaluationcom Click on Books, then click on this particular book, and then click on the option to download the pdf files Once you ve downloaded the tables, print them out, so you ll have them at hand This way, you can read the explanation and have the table in front of you Additionally, some of the tables are long, and the print will be larger and easier to read on a letter-size page, rather than the way they will appear in the book

selfnavigationItemrightBarButtonItem = navBut; 4 Note that every UIViewController has a navigationItem and that it is a read-only property 5 Open SecondViewControllerxib in Interface Builder and add a new bar button item to the

The loop that processes the file is the same as in Word-Length-3, but the code that sets it up is new and improved. The if statement verifies that the user supplied a path name as a launch parameter. The code consults the argc parameter to main(), which holds the number of launch parameters. Because the program name is always passed as a launch parameter, argc is always 1 or greater. If the user doesn t pass a file path, the value of argc is 1, and we have no file to read, so we print an error message and stop the program. If the user was thoughtful and provided a file path, argc is greater than one. We then look in the argv array to see what that file path is. argv[1] contains the filename the user has given us. (In case you re curious, the argv[0] parameter holds the name of the program.) If you re running the program in Terminal, it s easy to specify the name of the file on the command line, like so:

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