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ASPNET 20 Demystified
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expression, simply because you already know how to do it You've probably written the following You may think of this as a simple addition problem, but it is technically a mathematical expression that performs two operations First 1 and 1 are added together, and then the sum is placed on the left side of the equal sign: Here's another mathematical expression that you've already seen:
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FirstName
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In this example, the ASPNET engine is told to assign "Mary" to the FirstName variable Let's take a closer look and see how to write an expression
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Parts of an Expression
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A mathematical expression consists of two parts These are the operand(s) and the operator An operand is the value An operator is the symbol that tells the ASPNET engine how to evaluate the mathematical expression using the operand Think of operands as the numbers and the addition symbol as the operator The ASPNET engine evaluates this mathematical expression by adding the value on the right side of the operator to the value on the left side of the operator
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The assignment operator is an operator that tells the ASPNET engine to perform another operation The left side of the assignment operator must be a single value The right side can be a single value or an expression Let's insert the assignment operator into the previous mathematical expression and see how the second operation is evaluated The ASPNET engine is told to perform two operations The first operation is to add the value on the left side of the plus sign to the value on the right side of the plus sign If you could see the mathematical expression after the first operation is completed, it would look like this: The second operation is performed once the first operation is completed This operation uses the assignment operator (equal sign) to assign the result of the
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CHAPTER 4 Variables and Expressions i n ASPNET
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expression on the right side to the operand on the left Here's how this mathematical expression looks after the assignment operation is completed: Performing more than one operation in the same mathematical expression can lead to confusion-not for the ASPNET engine, but for you and me, because we may be unsure of the order in which the operations are performed Two operations were performed in the previous example: addition and the assignment operation ASPNET performed addition before performing the assignment operation However, you won't know which operation is performed first until you read the section "Order of Operations" later in this chapter
Types of Operators
Visual Basic NET has four types of operators These are arithmetical operators, logical operators, assignment operators, and comparison operators
Arithmetical Operators
Let's begin with arithmetical operators (see Table 4-1) No doubt these are familiar to you because they are they same operators that you use to perform everyday arithmetic However, at least one of these operators is probably something you haven't seen before This is the modulus operator (Mod) The modulus operator tells the ASPNET engine to divide the value on its left by the value on its right The modulus operator returns the remainder This is shown in the following examples:
23 Mod 10 is equal to 3
7Mod 10isequal to7
Operator
Description
Addition Subtraction Multiplication Division Modulus Exponent Integer division
Table 4-1 Arithmetical Operators
ASPONET20 Demystified
Logical Operators
Logical operators combine two logical expressions into one expression A logical expression is an expression that evaluates to either true or false The concept of a logical expression might be new to you because we normally don't write logical expressions during the course of the day Logical expressions are used in conjunction with other statements to tell the ASPNET engine to make decisions You'll see how this is done in the next chapter, but for now suppose your ASPNET engine needs to validate a user ID Here's the logical expression that you'll need to use:
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