Hi guys, query about ampersand..

 
Hi, am new to vbscripting & have a doubt, pls tell me where am wrong..
 
Ampersand(&) is used for string concatenation in vbscript, but when we use counter variable in programs eg in loops we use '&' in front of variable. In C language ampersand denotes address of variable, but in vb script it shows string concatenation so why we use ampersand(&) in front of variable in loops in vbscript. for example,
<script type="text/vbscript">
For i = 0 To 2
document.write("The number is " & i )
Next
</script>
outputs:-
The number is 0
The number is 1
The number is 2

why we are using '&i' here instead of just 'i'....if its for concatenation, then the program code should work if we remove '&' but it doesn't work then. please clarify where am wrong...thanks a lot..

 Dim s : s = "abc"
Dim n : n = 4711
WScript.Echo 0, n + n
WScript.Echo 1, s & s
WScript.Echo 2, s & n
WScript.Echo 3, s + s
On Error Resume Next
WScript.Echo 4, n + s
WScript.Echo 5, Err.Description
On Error GoTo 0
WScript.Quit 0 

 0 9422
1 abcabc
2 abc4711
3 abcabc
5 Typen unverträglich 

• (0) + is the operator for numerical addition
• (1) & is the operator for string concatenation with (2) automatic stringification
• (3) + can be used to concatenate strings
• (4/5) + won't concatenate strings with items of non-string type

Your
document.write("The number is " & i )
contains spurious () and the & is needed because otherwise you have two operands (string and number) but no operator.

Okay..Thanks a lot for making me understandthis :)... so '&' in vbscript is used to concatenate character string with any number or digit...am i right now..
 
thanks again..learning vbscript so would be visiting this great forum every now n then..thnxxx:)

The & operator isn't restricted to pairs of a string and a number; it will concatenate all items that can be stringified (CStr()) into a string.

Hmm..got it now..was thinking whether it is also used to denote that argument in 'document. write' is a variable..so checked it via
1. document.write("i")
2. document.write(i)
3. document.write(&i)
4. document.write("&i")
5. document.write("the number is " i)
 
here only 2nd option is good. So,yes understood that is used only for concatenation.
 
Thanks, at learning stage for vb script, not as easy as i thought when i came across vbscript objects & all
would be coming here often :)
 
thanks for d help!