C# Arraylist Confusion need help

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This no longer needs to be here as I have solved it myself

Posted 19-Dec-13 11:55am

Member 10477799

Updated 19-Dec-13 14:12pm

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sp_suresh 19-Dec-13 18:09pm

please briefly explain your code
here what u have given isfull size value?....

PIEBALDconsult 19-Dec-13 18:16pm

"insert the new value to the top of the list and move every other value down one"

You have that backward for one thing.

BillWoodruff 19-Dec-13 18:27pm

Do keep in mind that we can't see the definition of 'vals.

We also can't see where 'size is defined, or where the 'destroy method is called, where the 'isFull method is called, what you are doing with 'myList ... and so forth.

If you must use an Array, or ArrayList, please clarify your question.

For a solution using a Stack see my response below.

AghaKhan 19-Dec-13 18:29pm

Where you have created vals. Why are you doing that. This can be done with list<int>. Even your for loop is wrong.
It should be
for (int i = size - 1; i <= 1; I--)
{
vals[i - 1] = vals[i];
}

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BillWoodruff · Answer 1 · 2013-12-19T12:24:00

When you assign to vals[0] in 'addFirst, you overwrite whatever value is in it.

It's more work than necessary to turn an Array (or ArrayList ?) into the equivalent of LIFO (last in, first out) stack, when .NET gives you one ready to use in the System.Collections.Generic Library.

// create a new integer Stack
private Stack<int> intStack = new Stack<int>();

// somewhere in your code:

// add a value to the Stack
intStack.Push(100);

// return the value at the top of the Stack
int TopInt = intStack.Peek();

// remove and return the value at the top of the Stack
int TopInt = intStack.Pop();

What you give up by using a Stack is any way to use an index to access a particular element that is not on "top" of the Stack.