A Balanced Introduction to Computer Science
For Introduction to Computing and the Web courses in departments of Math and Computer Science.
Bridge Page: www.prenhall.com/reed
Author Website: www.dave-reed.com/book
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For example, suppose that you assign a value to a variable called lastName, then
later attempt to refer to that value with the name lastname. lastName = prompt("
Enter your last name", ""); . . . document.write(lastname); An error will occur when
this code is executed, because the variable lastname has not been assigned a
value (despite the fact that lastName has).The error message would identify the
write statement as the source of the error and would report that “lastname is not ...
the standard arithmetic operators (addition), (subtraction), (multiplication), and / (
kinds of numerical values, including numbers and mathematical expressions
formed by applying operators to numbers and/or other variables.When an
expression appears on the right-hand side of an assignment statement, that
expression is ...
These inputs must be specified when the function is called,and are subsequently
assigned to the parameters for completing the computation.As a result, the same
function can be used to perform different calculations,simply by providing diffe-
rent inputs when it is called. Recall the pics.html page from Chapter 7 (Figure
7.13). This page contains a single image named faceImg and two buttons, which
are recreated in Figure 9.2. Clicking the happy button (labeled “I feel happy”)
Internet and the Web
HTML and Web Pages
The Internet and the Web
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