+========================+ 
		|	Chapter 4	 |
		|Decisions And Conditions|	
		+========================+ 

       1. If statements
	  -------------
->If statement is the powerful asset which can be used to make decisions and
  to make decisions based on certain conditions.

->Syntax:	If(condition) Then
		........
		...(Action taken).....
		End If

->Example:	If curPRice>100 then
		MsgBox "Price exceeds"
		End If

	If ...Then..Else statements
	---------------------------
->Here in an If statement,when the condition is true,only the Then clause is 
executed.When the condition is false,only the Else slause ,if present,is 
ececuted.


->Syntax:	If(condition) Then
		........
		...statements.....
		[ElseIf (condition) Then
		........
		...statements.....]
		[Else
			statements]
		End If

->Note: A block If..Then..Else must always conclude with End If.Here Then 
  ----- must appear on the smae line as the If with nothing following 
	Then(except remark).End If and Else(if used) must appear alone on a 
	line. The statements under the Then and Else clauses are indented 
	for readability and clarity.

->Key note: The Keyword ElseIF is one word but End If are two words.
  ---------

->If statement works with six relational operators shown below.
	
	Symbol		Relation Tested
	-------		---------------
	  >		Greater Than
	  <		Less than
	  =		Equal to
	  <> 		not equal to
	  >=		greater than or equal to
	  <=		less than or equal to

->Conditions to be tested can be formed with numeric variables and constants,
string variables and constants,object properties,and arithmetic expressions.

->Note: Comparisons must be made of similiar types.i.e; string can be 
	compared only to the other strings,and numeric values can be compared
 	only to other other numeric values,etc.

	Comparing Strings
  	-----------------
->Here string varibales can be compared to other string variables or literals
enclosed in quotation marks.

->Here the comparison begins with the left-most character and proceeds one
character at a time from left to right.

->As soon as character in one string is not equal to the corresponding
charcter in another string,the comparison is terminated,and the string with
lower-ranking character is judged less than the other.

->The determination of which character is less than the another is based on
the ASCII code.
    ----------
->Shortcuts can be used when testing for True or False.
  
 Eg:
	If blnSuccessfulOperation =True Then. . . if equivalent to
	
	If blnSuccessfulOperation Then.....

	Boolean variables takes following values
	
	Value		NAme
	------		-----
	0		False
	-1		True

+--------------------------------------------------------------------------+
|Important: While working with the Text Property of Text Box be careful.The|
|========== Text Property behaves like a variant.That means when you use it|
|	    as String ,it acts like a String;but if you use it like number,|
|           it acts like a number.					   |
+--------------------------------------------------------------------------+

Examples:

txtFirst.txt 	txtSecond.txt 	txtFirst.txt> 	Val(txtFirst.txt)>
------------ 	-------------  	txtSecond.txt	Val(txtSecond.txt) 
				-------------	------------------   
                                     
	1	   +1		True		False
	
	2	   100		True		False

	+100	   -100		False		True
	
	0	  (blank)	True		False



	Comparing Uppercase and LowerCase Characters
	--------------------------------------------	
->VB uses two built in functions UCase() and LCase() which returns the 
uppercase or lowercase equivalent of a string,respectively.

->Syntax:
	UCase(string)
	LCase(String)

->Examples:
 
	txtOne.Text		UCase(txtOne.Text)	LCase(txtOne.Text)
	===========		==================	==================
	Robert Jones		ROBERT JONES		robert jones
	Hello			HELLO			hello