Bellow I added a manual execution where I explain step by step
what is happening.
This are the two windows at start: on the left the selection of a program
to run and on the right each state can be viewd in detail:
-1st box - program states
-2nd box - heap
-3rd box - console (prints can be viewd here)
-4th box - table of variables
-5th box - statement
After program selection, on the other window the only program state is selected.
On the bottom all statements can be seen in execution order.
After a fork statement, a new program state is created (simulating different processes)
and at each step both program states advance one step.
Once the execution is finished, the user is informed with a pop-up window.
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