vb.net qr code scanner Power Wrap-Up in Objective-C

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Power Wrap-Up
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The following sections summarize the chapter in an intensive reference style. Use these sections to look up facts related to the chapter without the chatter.
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Value and Variables
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Remember the following: Values are pieces of information you can manipulate in AppleScript. Variables are named containers you put values into for storage, allowing you to retrieve them later when you need them again. You assign strings to a variable: set x to "some text" copy "some text" to x
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String Values vs. Literal Strings
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A string value contains a piece of text as a series, or string, of characters. A string value is represented in AppleScript code as a literal string, which is a pair of double quotes with the string s actual text in between:
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CHAPTER 3 INTRODUCING VALUES
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"Hello World!" "42" "" To include double quotes in your string literals, use the backslash (\) character to escape them, like this: set x to "Press the \"OK\" button" --> x = Press the "OK" button Another way to include double quotes in your string is to use the quote variable, like this: set x to "Press the " & quote & "OK" & quote & " button" --> x = Press the "OK" button You also have to escape the backslash if you want to include it in a string literal, like this: set x to "This is a backslash: \\" --> x = This is a backslash: \
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Including Tabs, Returns, Spaces, and Quotes
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To include tabs, returns, and linefeeds in string literals, you can use \t, \r, and \n, respectively: set tab_delimited_text to "Name\tCity\rJoan/tNew York/rJames\tAtlanta" --Result: Name City Joan New York James Atlanta Outside the quotes you can specify the tab, space, double quotes, and return characters using their names, like this: set tab_delimited_text to "Name" & tab & "City" & return & "Joan" & tab & "New" & space & "York" --Result: Name City Joan New York To add quotes, do this: set the_string to "Press the" & space & quote & "OK" & quote & space & "button" You can set the constants space, tab, quote, and return to other values; however, this is not recommended.
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ASCII Numbers and Characters
Use the ASCII character command to get a character according to its position in the MacRoman character set table: ASCII character 36 --> "$" The ASCII number command works the opposite way: you provide the character, and the result is the character that fits the position in the MacRoman character table: ASCII character "$" --> 36
CHAPTER 3 INTRODUCING VALUES
String Operators
The main operator used with strings is the concatenation operator, which is the ampersand: &. The two operands are strings, but the right operand can be any value class that can be coerced into a string. The following line concatenates (joins) the string to the left of the operator and the string to the right of it to produce a new string: "Apple" & "Script" --> "AppleScript" Take care: if the left operand is not a string, the result of the operation is a list, not a string: "$" --> 5 & --> & 5 "$5" "%" {5, "%"} The correct way to get a string result when the left operand is a real or integer is this: (5 as string) & "%" --> "5%"
Comparing Strings
You can compare strings using the following operators: =, , >, , <, , starts with, ends with, contains, and is in: "Apple" = "Orange" --> false With the >, <, , and operators, the larger character is the character that appears later in the alphabet: "A" > "B" --> false
Considering and Ignoring
You can consider and ignore different attributes of the text to sway the comparison results in different ways: ignoring case and punctuation "Hello There!!!" = "hello there" end ignoring --> true considering case and punctuation "Hello There!!!" = "hello there" end ignoring --> false
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