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WMLScript Bitwise Operators
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Adding Functionality with WMLScript
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Shorthand Operator += -= *= /= %= ++
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Example x += 5; x -= 5; x *= 5; x /= 5; x %= 5; ++x x
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Regular Arithmetic Equivalent x = x + 5; x = x - 5; x = x * 5; x = x / 5; x = x % 5; x=x+1 x=x-1
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Table 7-2
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Shorthand Arithmetic Operators
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This may look like a neat way to write shorter code, but remember that the compiled code will be exactly the same, whichever way you write it If in doubt, write for clarity, not because it looks really cool The last two shortcut operators (++ and ) can cause some very interesting bugs if you are not careful The ++ operator increments a given variable by 1, and the operator decrements a given variable by 1 They are used like this:
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var interest_rate = 70; ++interest_rate; --interest_rate; // interest_rate now contains 80 // interest_rate is now back at 70
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This can get complicated because you can put the ++ in front of the variable, known as prefix, or after the variable, known as postfix
++interest_rate; interest_rate++; // Prefix // Postfix
They may look the same, and indeed, if they are placed on a line by themselves, the end result will be identical the variable interest_rate will be incremented by 1 The trick is the point at which the variable is incremented If you say this,
var interest_rate = 70; bankcharges = ++interest_rate;
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the value of the variable interest_rate is incremented before it is assigned to the variable bankcharges, so that bankcharges now holds the value of 80 However if you postfix the increment operator, like this,
var interest_rate = 70; bankcharges = interest_rate++;
the value of the variable interest_rate is incremented after the value has been assigned to the variable bankcharges, so although at the end of the line of code interest_rate will hold the value of 80, bankcharges will only have the value of 70 Obviously, these are two different results If the variable bankcharges is used further in the application (and one assumes that that was the reason for assigning the value to the variable in the first place), then any calculations based on it will be incorrect, because the bank s intention is, of course, to charge as much as they can get away with Another classic place to use these operators is in a control loop, where you simply increment a counter by 1 every time you go around the loop If you use this counter somewhere inside the loop itself, then you really have to make sure that it has the value that you intended it to have when you use it A loop counter that counts from 0 to 9 is not the same as a loop counter that counts from 1 to 10, even though the loop itself runs the same number of times
Logical Operators
While the operators that we have looked at so far deal with numerical values, logical operators deal with comparisons between the logical values true and false It is the ability to make logical decisions based on different values that allows programmers to have their code make choices that can send the user down the correct branch of the application Most normal expressions can be evaluated to be true or false, like this one:
X > 3;
If x were any number up to 3, then this expression would evaluate to false If x were any number larger than 3, then this would evaluate to true
NOTE: If you want check the equality of two sides of an expression, you have to use a comparison operator consisting of two equal signs (==) We will be dealing with these in the next section If we were to write x = 3, the answer would always be true , as x would be assigned the value of 3 and so would be equal to 3 Little things like this can make a developer s life exciting
The logical operators for WMLScript are listed in Table 7-3
7:
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