Page 198 - DCAP408_WEB_PROGRAMMING

Web Programming

Notes
Operator Function Example Result
= Equal to 9 = 10 False
< Less than aNumber = 5, aNumber < 10 True
> Greater than aNumber = 5, aNumber > 10 False
<> Not equal to 5 <> 10 True

Logical Operators

Logical operators take the result produced by comparison operators and compares them to
create new true or false values. For example, true AND false = false.

Operator Function Example Result
AND True if both are true, otherwise false 9 = 10 AND 10 = 10 False
OR True if at least one is true, otherwise false 9 = 10 OR 10 = 10 True
Not Reverses truth value 5 = 5 False

String Operators

There is only one string operator and that is the concatenation operator”&”. This operator is
used to combine text strings.

Example: <% Dim stringOne = “This is “ Dim stringTwo = “a text string”
Response. Write (stringOne & stringTwo & “<br />”) Response.Write(“ASP
stands for “ & “Active “ & “ Server “ & “ Pages “) %>
Output:
This is a text string ASP stands for Active Server Pages

7.5 ASP Conditional Statement

When performing assignments using code, sometimes you must find out whether a given
situation bears a valid value. This is done by checking a condition. To support this, VBScript
provides a series of words that can be combined to perform validations. Checking a condition
usually produces a True or a False result. Once the condition has been checked, you can use the
result (as True or False) to take action. Because there are different ways to check a condition,
there are also different types of keywords to check different things. To use them, you must be
aware of what each does or cannot do so you would select the right one.

The Boolean Type

Sometimes, you may want to store the result of a condition, being true or false, in a variable.
To do this, you can declare a variable that would hold a Boolean value. Here is an example of
declaring a Boolean variable when the form opens:
Dim IsMarried

When a Boolean variable has been declared, you can assign it a True or a False value.
To convert a value or an expression to Boolean, use the CBool() function.
Techniques of Checking a Condition

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