WHY AM I GETTING THE BUG IN THE CODE? [SOLVED]

Question

I am almost done with my C# lessons on sololearn and I decided to practise with some of the newly acquired ideas on stack collection.
Why am I encountering the bug in the code?

https://code.sololearn.com/cxlvndP3Bgou/?ref=app

Answer 1

The error occurs because on line 48, in the foreach loop, you are modifying the stack while iterating on it. Just replace
`foreach (string i in friends)`
with
`for (int i=0; i < friends.Count; i++)`
And it will work fine
https://code.sololearn.com/c2VFDrrrKNMq/?ref=app

Answer 2

The mistake in the lines below, you should change tp another loop, because you modify your collection friends you cannot use foreach for it.

foreach (string i in friends)
Console.WriteLine("Pop: " + friends.Pop());

Answer 3

It worked! Thanks XXX, Vladimir & elvisreal
👍🏼

Answer 4

Not expert at cs, but it has to do with your try block

https://code.sololearn.com/crdjMZbGInuS/?ref=app

Answer 5

As said, Modifiying collection in Foreach causing error.
Also for normal for loop use copy of friends.count as
maxI= friends.count ; and use i<maxI. Because friends.count also modifed, you miss some elements poping..
Here Iterator works fine for modifying collections...

Answer 6

Jayakrishna🇮🇳
Oh that's true. Thanks 👍🏼.
I'll add that too.

Answer 7

In html, When i use / for ending code it displays the same results as without / why?plz answer me also