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Tutorial 122 | Using the Stack class

Store, check and delete information in a Stack object

The Stack class allows you to create a collection of data elements accessed on a last-in, first-out (LIFO) basis. It is part of the elsystem.collections namespace that also contains the Dictionary, GlobalDictionary, Vector, and Queue classes.

In other tutorials and programs I have tended to use Arrays, Dictionaries and Vectors because of their abilities to access data flexibly. For example, with a Vector it is possible to access date based on an index whereas with the Stack you can only:

  • add an element at the ‘top’ of the stack (using the push method)
  • delete an element at the ‘top’ of the stack (using the pop method)
  • see what the element is at the ‘top’ of the stack (using the peek method)

It is also possible to clear and clone the stack. I demonstrate all these methods in a 9 minute video below.

The example program is available to Gold Pass members below so that they can experiment further with it.

Summary of tutorial 122

In this tutorial I demonstrate the stack class in the following steps:

  1. Add a data element
  2. Print the value of the element just added and a count of the stack
  3. Add a second data element
  4. Print the value of the element just added and a count of the stack
  5. Add a third data element
  6. Print the value of the element just added and a count of the stack
  7. Make a clone of the stack (with currently has 3 elements)
  8. Remove an element from the stack
  9. Print the element removed, the element at the top of the stack and the number of elements in the stack
  10. Remove all the elements from the stack
  11. Print the number of elements in the stack
  12. Print the contents of the clone of the stack (make in step 7)
  13. Demonstrate that an object can be added to a stack

Programming lessons

The tutorial demonstrates how to:

  • Add and remove data from a stack
  • Access the value of the data element at the top of the stack
  • Clear all elements from the stack
  • Clone a stack
  • Add an object to a stack

and explains some differences between the stack and vector classes

The code is available free to Gold Pass members (see below).

 Video explanation of tutorial 122

 Gold Pass area

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