2: Operators

Manipulating VBScript Variables with Operators
As you have already seen the VBScript = assignment operator is used to assign a value to a variable. When you are working with variables that contain numeric values, you can use any of the VBScript arithmetic operators, shown in Table, to change the value assigned to variables.

Arithmetic Operators
Operator	Description
^	Exponentiation
-	Negation
*	Multiplication
/	Division
\	Integer division
Mod	Modulus
+	Addition
-	Subtraction
&	Concatenation

The following VBScript statements show how you can apply some of the operators.

Option Explicit   

Dim myExp   

myExp = 37   

WScript.Echo " myExp= " & myAge   

 myExp = myExp + 3   

WScript.Echo " myExp = " & myAge   

  myExp = myExp - 10   

WScript.Echo " myExp = " & myExp   

    

myExp = myExp * 2   

WScript.Echo " myExp = " & myExp

If you were to save this script as part of a WSH VBScript and run it from the CScript.exe execution host then you’d see the output shown here.

myExp = 37   

myExp = 40   

myExp = 30   

myExp = 60

VBScript performs arithmetic operations using a strict set of rules known as the order of operator precedence.

Comparison Operators

VBScript provides a collection of operators that you can use to compare the values of expressions within your VBScripts. These operators are listed inTable.  

Comparison Operators
Operator	Description
=	Equal
<>	Not equal
<	Less than
>	Greater than
<=	Less than or equal to
>=	Greater than or equal to

Testing the values of variables in your scripts is something that you’ll find yourself doing again and again. When combined with conditional execution logic, which I’ll cover in just a bit, you’ll be able to write scripts that can test for certain conditions and then switch between multiple execution paths based on the results of those tests.Unlike arithmetic operators, there is no order of precedence to the execution of comparison operators. They are executed in the order in which they appear in a statement (e.g., they are evaluated starting from left to right).For example, the following statement tests to see if values of two variables are equal.

Option Explicit Dim myExp, yourExpIf myExp = yourExp Then   

 WScript.Echo "Congrates!!!"   

End If

Similarly, you can test for greater than or less than values.

If myExp > yourExp Then WScript.Echo "May I Check it?"   

End If   

If myExp < yourExp Then   

 WScript.Echo "Would you like to Check it?"   

End If

Next Step – Conditional Statements