lesson-data/code.cs at main · 0-base2/lesson-data · GitHub

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using System;
using System.Collections;


public class Stack {

	// Old Code:
	// ArrayList stack = new();

	// Corrected Code:
    ArrayList stack = new ArrayList();

    public Stack() {}

    public void Push(int n)
    {
        stack.Add(n);
    }

    public int Pop()
    {
        if (Size() > 0)
        {
            int ele = (int)stack[stack.Count-1];
            stack.RemoveAt(stack.Count-1);
            return ele;
        }
        return -1;
    }

    public int Size()
    {
        return stack.Count;
    }
}


// Add this to allow compilation and execution
class Program {
	public static void Main(string[] args) {
	}
}