qr code generator java download Using Value Parameters in Java

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Using Value Parameters
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You can also send a value as a parameter directly Instead of needing to declare a global variable in order to send a parameter, you can just send a value that will be turned into a local variable inside the function This allows you to send a value on the fly and eliminates the need to have a global variable handy The important thing to remember is that if you send a string value, you need to enclose it in quotes The following function call sends a string value of something to a function named text_alert():
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text_alert("something");
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4: Using Functions
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For example, the last example in the previous section can be modified to add more information while using one less line by using value parameters:
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function check_alert(pcheck,car) { windowalert("You make $"+pcheck+" and have a "+car); } The function is sent a numeric value and check_alert(1200,"Corvette");
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a string value instead of variable values
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In this example, the function call sends two parameters to the function The first one is a numeric value and does not need quotes The second value is a string and needs to be enclosed in quotes These values are then sent to the function, where they are read in as the local variables pcheck and car, respectively They can now be used in the function to display this sentence in an alert:
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You make $1200 and have a Corvette
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Parameters can also be sent using expressions, such as the following:
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check_alert(500+700, "Cor"+"vette");
JavaScript will evaluate each expression and send the results as parameters to the function Thus, the preceding code would have the same end result (adding 500 and 700 gives 1200, and adding Cor and vette gives Corvette ):
You make $1200 and have a Corvette
Parameters Are Optional
Another thing that should be mentioned is that sending parameters to a function is optional The function will do its best to do its work without the parameter values that are not sent You could call the function check_alert() without any parameters:
function check_alert(pcheck,car) { windowalert("You make $"+pcheck+" and have a "+car); } check_alert();
Your result would be something like the following text:
You make $undefined and have a undefined
Thus, it is a good idea to set up some code to handle a situation where a parameter is not sent This can be done using conditionals Here is one way to check if the parameters were sent to check_alert():
function check_alert(pcheck,car) { if (pcheck && car) { windowalert("You make $"+pcheck+" and have a "+car); }
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else { windowalert("My parameters are missing!"); } } check_alert();
This essentially tells JavaScript to see if the parameters exist before writing the statement to the page If they do exist, the statement is written on the page with the parameter values If they do not exist, then the viewer gets an alert that says My parameters are missing! The logical operator && will be discussed in more detail in 5 and the if/else statement will be discussed in more detail in 6
Calling Functions with Return Statements
To call a function and use a return statement in the function, you can assign the result of the function to a variable In this way, the variable gets the value returned from the function and can be used later in the script This is the format for declaring a variable that has the value returned by a function:
var variablename=functionname();
Consider the previous example, which had a function that returned the value of two text strings added together You can modify it so that the function result is assigned to a variable, as follows:
function get_added_text() { var textpart1="This is "; var textpart2="fun!"; var added_text=textpart1+textpart2; return added_text; The result of the added text is returned to the script } var alert_text=get_added_text(); The result of the function is assigned to a variable windowalert(alert_text);
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