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Trace Working and Saved Copies - Practice 2

Follow each edit, save and reopening in order.

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Watch the lesson | Practice 1

5 questions0m 0s
Learn the skill

Keep two counts: working copy and saved file. Opening copies the saved drawing into working memory. An edit changes only the working copy. A successful save replaces the saved drawing with the working copy. Discarding unsaved edits and reopening restores the saved drawing. Autosave and recovery are off in this paper model.

Worked example

Open a saved drawing of 3 squares; add 2 and save. Both copies now have 5. Remove 1 without saving: working has 4, saved has 5. Discard that edit and reopen: the drawing has 5 squares.

Worked example: three squares, not the practice drawing. OPEN AND EDIT: Saved: 3 squares: Add 2; working: 5. SAVE, THEN EDIT: Saved: 5 squares: Remove 1; working: 4. DISCARD / REOPEN: Last save: 5 squares: Reopened: 5 squares.
Example values are different from the practice data.

A Different Drawing

The saved drawing starts with 10 dots. Open it, add 3 dots, then successfully save to the same file. Next remove 5 dots without saving. Finally discard the unsaved edit and reopen that saved file. All steps use one fictional file; autosave and recovery are off. Do not delete files or switch off equipment to test this story.

Question 1 Just after adding 3 dots, but before saving, how many are in the working copy?
Question 2 At that same moment, before the first save, how many are in the saved file?
Question 3 After saving and then removing 5 without saving again, how many are in the working copy?
Question 4 After discarding the unsaved edit and reopening, how many are in the drawing?
Question 5 Why must the story tell us that autosave and recovery are off?