Programming C, C++, Java, PHP, Ruby, Turing, VB
Computer Science Canada 
Programming C, C++, Java, PHP, Ruby, Turing, VB  

Username:   Password: 
 RegisterRegister   
 Index function
Index -> Programming, Visual Basic and Other Basics -> Visual Basic Help
View previous topic Printable versionDownload TopicSubscribe to this topicPrivate MessagesRefresh page View next topic
Author Message
Raknarg




PostPosted: Wed May 25, 2011 9:58 am   Post subject: Index function

Is there a string indexing function in VB like there is in Turing?
Sponsor
Sponsor
Sponsor
sponsor
Nick




PostPosted: Wed May 25, 2011 10:10 am   Post subject: RE:Index function

string.IndexOf ("pattern")
2goto1




PostPosted: Wed May 25, 2011 10:11 am   Post subject: RE:Index function

There are quite a few more things you can with strings, http://msdn.microsoft.com/en-us/library/system.string.aspx
Raknarg




PostPosted: Wed May 25, 2011 10:36 am   Post subject: RE:Index function

Ok then, one more question: What value does String.Compare return if the string isn't inside the other string? I tried 0, but it doesn't seem to work.
2goto1




PostPosted: Wed May 25, 2011 12:24 pm   Post subject: Re: Index function

Compare returns an integer that indicates their relative position in the sort order, as mentioned at http://msdn.microsoft.com/en-us/library/84787k22.aspx

It tells you the alphabetical ordering of two strings. Here are some test cases that you can try:

code:
String.Compare("A", "B")
Returns -1 since A is alphabetically before B
code:
String.Compare("a", "B")
Returns -1 since a is alphabetically before B
code:
String.Compare("B", "A")
Returns 1 since B is alphabetically after A
code:
String.Compare("B", "B")
Returns 0 since B is alphabetically the same as B

Here?s where it can get confusing:
code:
String.Compare("B", "b")
Returns 1 since although B is alphabetically the same as b, B?s character code is less than b
code:
String.Compare("b", "B")
Returns -1 since although b is alphabetically the same as B, b?s character code is greater than B

The API seems to differ once you start comparing the same letter, but different case. If your intent is to determine that b is alphabetically the same as B, then your best bet is to use this method:

code:
String.Compare("b", "B", true)
Returns 0 - equivalent ignoring case

Where true means to ignore case.

The same thing applies when comparing longer strings, i.e.:

code:
String.Compare("Apple", "Apricot", true)
Returns -1 since apple is alphabetically before Apricot
code:
String.Compare("Apricot", "Apple", true)
Returns 1 since apricot is alphabetically before apple
Raknarg




PostPosted: Wed May 25, 2011 3:05 pm   Post subject: RE:Index function

Oh, thanks, I was using it wrong.
Display posts from previous:   
   Index -> Programming, Visual Basic and Other Basics -> Visual Basic Help
View previous topic Tell A FriendPrintable versionDownload TopicSubscribe to this topicPrivate MessagesRefresh page View next topic

Page 1 of 1  [ 6 Posts ]
Jump to:   


Style:  
Search: