VB Script, What is VB Script, VB Script and QTP



VB Script, What is VB Script, VB Script and QTP

What is VBScript?

VBScript is the sub language of Visual Basic 4.0 programming language. It is called scripting language. It is developed because Microsoft gives us more powerful processing power on client server for web pages. Actually VBScript language can be used to code on both sides server and client side scripting. Even if you don't aware about the VB Script even then if is easy to learn and use to work with QTP

First we will discuss about Data types in VB Script -:

Only one type of data types is supported by the VB Script which is called 'Variant'. This is special type of data type which can contains different types of information. It's also the default data type and returned by all the function available in VBScript. Actually variant is like a numerical data type but when it used f numeric or string then it returned in same context. So its also possible in VB Script to make numbers behaves as same as string by enclosing them with in the quote.

Variables in VBScript :-

Variables like a place holder that contains the memory locatioin that store the programs information that can change dynamically at run time. Variable is just refereed by its name for accessing the value saved or to edited its value.

Variables Declaration :-

There are three ways to declare the variables in VB Script -
  1. Dim Statement
  2. Public Statement
  3. Private Statement

For Example -:
Dim No_Passengers

You also declare multiple variables by following ways:
Dim Left, Right, Top, Bottom

one more thing variable also can be declare by implicitly by simply using its name in available script. That will not be a good practice because there are possibilities of mistakes of misspelling of variables.
There fore Option Explicit statement is available to required explicit declaration for all the variables.

Note:
Variable declare with Dim at the level of script is available to all the procedures with in the scripts. So at procedure level, variable is available only with in the procedures.

Public statement is default used for all the procedures in all the scripts.
Private statement variable is used to only for any specific script and after this it can not be used in another script.

Naming Convention:

There are some standard rules for naming in VBScript which are provided below:
  1. Variable starts with the an alphabetic character.
  2. Embedded period can not be contain
  3. Variable name must not exceed more than 255 character
  4. Variables Must be unique and the scope in which it declared.

Value assignment to Variables :-
Two ways of assigning the values to variables are:
Scalar Variables :- Dim Top
Top = 200

Array Variables like – Dim Top(11)

Constants:
Constants in VBScript
Constants in VBScript






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