Page 209 - Web_Application_v2.0_C12_Fb
P. 209

<H2>JavaScript Functions</H2>
                    <P>This code calls a function which multiplies two numbers</P>

                    <SCRIPT>
                    function myFunction(p1, p2) //Function definition
                    {

                    document.write("The product is "+(p1*p2)); //Function body
                    }
                    myFunction(4, 3); //Function call
                    </SCRIPT>
                    </BODY>

                    </HTML>
                 Output:



















                 The return Statement
                 Frequently, functions calculate a return value. The caller receives the return value. If a statement called the
                 function, JavaScript control will return to run the statements that follow after the function invocation. A return
                 statement in JavaScript causes the function to terminate.

                 The syntax to use the return statement in JavaScript is as follows:
                    function functionName(parameters){

                    //code block
                    return value;
                    }
                 Example 19: To demonstrate the use of return statement

                                                                                Notes
                    <!DOCTYPE HTML>
                    <HTML>
                                                                                Whenever we have a return statement
                    <HEAD>                                                      in a function, we must either store the
                    <TITLE>Return Statement</TITLE>                             result in a variable and output it or call
                                                                                the function inside an output statement.
                    </HEAD>
                                                                                Otherwise we will not get any output.
                    <BODY>
                    <H2>JavaScript Functions</H2>
                    <P>Function to convert temperature from Fahrenheit to Celsius</P>
                    <SCRIPT>
                    function Convert_to_Celsius(f) {

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