asp.net barcode scanning TEACHING YOUR SCRIPT TO MAKE DECISIONS in Objective-C

Draw QR Code ISO/IEC18004 in Objective-C TEACHING YOUR SCRIPT TO MAKE DECISIONS

CHAPTER 10 TEACHING YOUR SCRIPT TO MAKE DECISIONS
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The following script contains a single conditional statement. If the condition is false, then line 2 of the script will be skipped, and the statement will end without anything happening. if exists document 1 then set text of document 1 to "Hello!" end if The previous script will execute the statement in line 2 only when the condition, in this case whether document 1 exists, is true. But what will happen if the statement is false What if you want the script to make a new document if none exists In that case, you use the else clause. The else clause divides the conditional statement into two parts: what happens when the condition is true and what happens when it is false. It s that simple! In this case, the script will look like this: if exists document 1 then set text of document 1 to "Hello!" else make new document with properties {text: "Hello!"} end if The script in Figure 10-2 shows another example of the else clause being used.
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Figure 10-2. A conditional statement is used with the else clause. The example in Figure 10-2 should be clear enough, but just to make sure, Figure 10-3 shows a flowchart that describes the script.
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CHAPTER 10 TEACHING YOUR SCRIPT TO MAKE DECISIONS
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Figure 10-3. A conditional statement s flowchart
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Learning More About Conditions
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Often, a conditional statement will test for multiple conditions. In this case, AppleScript will look for the first test clause whose condition is true and execute its statements, and then the conditional statement will end. Here s how it might work logically you re at a party, and you want something to drink. If there s soda, you drink that. If there isn t, you look for beer. If there s no beer, you check for vodka instead. If there s no vodka left, the party has run dry, and you ll probably want to think about heading home. In AppleScript, the conditional statement for this search for liquid may look like this: if exists "soda" then set contents of glass to "soda" else if exists "beer" then set contents of glass to "beer" else if exists "Vodka" then set contents of glass to "Vodka" else set contents of glass to "" end if
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CHAPTER 10 TEACHING YOUR SCRIPT TO MAKE DECISIONS
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The first condition checks for soda. If there is soda, it makes no difference whether there s also beer or vodka you will fill your glass with soda and skip the beer part. If there s no soda, the beer gets a chance. If there s no beer, it ll try for vodka. If there s no vodka, it means nothing is left, and it s time to head home. Now, suppose you go hunt for drinks for yourself and a friend. Your friend, for argument s sake, has the same preference as you: he would rather get soda, but if not, then beer is OK, and so on. To write a script that will fetch drinks for both of you, you will need to run the conditional statement twice you will look at this next.
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Implementing the Party
You can do run the conditional statement twice in a couple of ways. If the script will always look for drinks for two people only, you can explicitly run the condition twice, as shown in Script 10-1. Script 10-1. 1. local my_drink, friend_drink 2. property sodas_left : 4 3. property beers_left : 1 4. property vodkas_left : 5 5. -- pour me a drink 6. if sodas_left > 0 then 7. set my_drink to "soda" 8. set sodas_left to sodas_left - 1 9. else if beers_left > 0 then 10. set my_drink to "beer" 11. set beers_left to beers_left - 1 12. else if vodkas_left > 0 then 13. set my_drink to "Vodka" 14. set vodkas_left to vodkas_left - 1 15. else 16. set my_drink to "nothing" 17. end if 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. -- pour drink for a friend if sodas_left > 0 then set friend_drink to "soda" set sodas_left to sodas_left - 1 else if beers_left > 0 then set friend_drink to "beer" set beers_left to beers_left - 1 else if vodkas_left > 0 then set friend_drink to "Vodka" set vodkas_left to vodkas_left - 1 else set friend_drink to "nothing" end if
31. display dialog "I'm drinking " & my_drink & return & "My friend is drinking " & friend_drink 32. display dialog "Drinks remaining:" & return & sodas_left & " soda, " & beers_left & " beer, " & vodkas_left & " vodka"
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