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Operator Precedence
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x = 1 + 2 * 3; y = (1 + 2) * 3;
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Here, x will be 7, and y will be 9 This is because the rules of operator precedence (which are standard mathematical rules, not just applicable to WMLScript) dictate that multiplication takes place before addition However, the contents of any brackets are evaluated before any expressions outside of brackets In the previous expressions, x is 7 because the multiplication is done first, and then the addition In the second case, y is 9 because the expression in the brackets is evaluated first A scale of operator precedence follows shortly, but you can go cross-eyed trying to figure out how to write an algorithm and make it all work properly It is more important to keep the following simple rule of thumb in mind: Always place brackets around the parts of the expressions that you want to have evaluated together as a unit As far as operator precedence is concerned, that really is all you will ever need to know in order to keep all of your mathematical equations working perfectly It often helps to make the code more readable as well
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Operator precedence the sequence in which the operators are evaluated in an expression must be taken into consideration when you are putting any kind of arithmetic functionality into your application Consider this simple example:
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Testing the validity first makes sure that the result, z, will contain a valid number before you move on to the rest of the code (Of course, the default value could be any other value instead of 0)
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You could write the earlier expression for x in either of the following formats:
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x = 1 + 2 * 3; x = 1 + (2 * 3);
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Both of these give identical results, but the second version is totally unambiguous It is really clear that 2 is multiplied by 3 first, before adding the 1! If you bear this in mind, you can never really go wrong The scale, of operator precedence is as follows, in order of priority
++ -- ! () * / div % + << >> >>> < <= > >= == != & ^ | && || : = += -= *= , typeof isvalid
div=
>>>=
CONTROL CONSTRUCTS
Finally, we get to the things that give any programming language its real power and versatility A control construct allows the programmer to make decisions based on the value or values of data entered, and have the program take a different route depending on those values The control constructs in WML are IF ELSE, WHILE, and FOR We will examine these one at a time
If Statements
An if statement consists of the evaluation of a condition followed by one or two separate statements or blocks of statements If the evaluated value is true, the first statement or block of statements is executed If the evaluated condition is false, then the second statement or block of statements (if it exists) is executed Here are some examples that will also demonstrate the syntax:
var x = 1;
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if (x == 1) { rate = 65; }
This is the simplest form of the if statement, where there is just one statement to be executed if a simple condition evaluates to true The condition to be evaluated follows the if statement and is always enclosed in round brackets A code block is then opened, and the statements to be executed if the condition evaluates to true are placed inside it In this case, the variable rate is assigned a value of 65, but the statements can be any valid WMLScript statements, including other if statements Notice that I have used the == operator to test for equality As mentioned earlier in this chapter, if you use the single equal sign (=), then an assignment will be made and the condition will always be true Here s another example:
var age = 21; var msg; var nextdeck; if (age >= 18) { msg = "Please place your vote"; nextdeck = "acceptwml"; } else { msg = "Sorry, you're too young to vote"; nextdeck = "rejectwml"; }
Here, the variable age is set to 21 When the code is run, the condition age >= 18 evaluates to true, and the first code block is run The variable msg is set to Please place your vote, and the variable nextdeck is set to acceptwml You can also nest if statements within other if statements, like so:
if ( age >= 18 ) { if ( age >= 65 ) { msg = "Welcome to Retirement Plaza"; } else { msg = "Welcome to Homes of the Future"; } } else { msg = "You are too young to buy real estate"; }
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