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I won't do it line by line, but I will explain what recursion does and hopefully that will help you. Basically, recursion refers to a method calling itself until some condition is met - (if there is no condition to meet, this is referred to as infinite recursion and is generally seen as a bad thing).
The code above is stepping into the displayRef method repeatedly, and is subtracting a character from the string that it passes into itself on each recursion. The terminating condition is the string being empty. When the string is empty, it exits from the method (the return statement) and unwinds itself back up the stack.
As you can see, the unwind simply writes the first character of the substring to the console.
I hope that helps.
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jalburzicon wrote: Can you explain the code line by line?
Please, first read [^]
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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in the end of recursion,does it return "e" from if-statement,
with every recursion , does it writes str[0]?
these are my problems =(
I understand the logic, but I cant get into code, it is necessary to write by myself, thanks
Insistence
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Just single step through the code in the debugger and watch what it is doing. Basically your recursive step occurs while the length of str is greater than zero. The base case is when the length of str is 0. From a quick glance, the recursive function doesn't look like as good of an example as something like the basic recursive factorial function, which is more clear about what is going on...
Essentially, the displayRev puts the original string onto the stack in forward order, but displays as reverse when popping off the stack...
"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus
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Thanks about the debugger idea, I am not that practical on programming yet as you see..
Insistence
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Since I get the impression you are just learning about recursion, learning how to use the debugger to assist you in looking through code execution, now isn't too bad of a time to get familiar with using debuggers 
"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus
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Insistence
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Hi,
Does anybody knows why this unhandled exception occurs and how to resolve this.
"Format of the initialization string does not conform to specification starting at index 0" in my oledb connection string
Thanks in advance.
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Hurry! problem has gone!!!
There was a very little mistake in the connection string path of the database is wrongly mensioned. Correcting the path solved the issue.
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hello, is it possible to get the contents list of a remote http folder thorugh th system.net.webrequest() method..or is there any other way for to get the directory listing the contents
aneef
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I know that it can be done with FTP, which might be useful to you - I dont have any code to hand but you would
1. Create an FtpWebRequest
2. Set the method property to ListDirectoryDetails
3. Set credentials
4. Call the GetResponseStream method
5. Pass it to a StreamReader and use the readline function to iterate though the lines in the file
Note that you get more than just the filename, you get some other information too such as the size, etc and folders are included so you might need to format the responses in some way.
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wow thanx alot.. i will give a try on this... thanx again
aneef
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How to make my form acts as a dialog box when it is called from a menu item.
I could do this using Form.ShowDialog() within any event of any control on a form.
But when I called this function on the click event of a menu item, I got the following exception .
"Forms that are not top level forms cannot be displayed as a modal dialog. Remove the form from any parent form before calling showDialog"
Mohamed Gouda
Egypt
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Try:
Form.ShowDialog(this);
This will create a modal dialog form on top of the main form.
Jeff Clark
Systems Architect
JP Clark, INC.
Columbus, Ohio
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Thanks Jeff .
It did not work. But you helped me rethinking about my code and discover my fault  .
The problem was that I defined the MdiParent property of the dialog form to be this
My code was some thing like this.
MyDialogForm dialogForm = new MyDialogForm();<br />
dialogForm.MdiParent = this;
dialogForm.ShowDialog();
However, Thanks a lot
Mohamed Gouda
Egypt
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First I do not what is TX control.
But I think that you can add all .dll files that appears after installing that control. add them to your code as reference.
Another solution:
If you do not want to ask your client to install that control first, you can create your own installation wizard that implicitly installes that control
Mohamed Gouda
Egypt
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Normally I don't do blatant self promotion, but I feel that your case is different. Please read these [^] guidelines, especially the section on reposting a question.
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Hi,
My problem is when i merge one dataset with the previous one, the content of the previous dataset disapear.hence i only get one dataset which is the last merge operation.
I keeps loosing the prevoius merge operation.
Please if you can give me an example, on how i can retain the previous merge.
Thanks
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Reposting the same question is considered rude.
If you dont understand the functionality of Merge try re-reading the docs.
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Thanks for your comment!,
I have used from your link :
DataSet.Merge (DataSet, Boolean)
My two dataset have the same schema.what i want to keep the result of the dataset in to one datset
that will keeps building up the dataset which out loosing the previous datset operation.
Thanks
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Get the latest files from VSS.
There are several projects in the solution.
These projects refer to a web reference.
All projects build fine except one of them.
The problem is to do with the web reference.
Under web reference there is a reference to MarketdataService which is the webservice.
But every time I delete and add the web reference, it adds the extension 1 to the end of it i.e. MarketDataService1
On the hard drive I can see the new folder is added and even deleting it and re-adding the web reference still adds the extension 1 to the web reference name.
Not sure why this is happening.
Thanks
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