Execution steps:

Whenever the program is executed, the steps below will take place:

• The script calcandprintarea starts executing.
• The calcandprintarea calls the readradius function:
• readradius executes and returns to the radius.
• calcandprintarea resumes executing and calls the calcarea function, by passing the radius to it:
• calcarea executes & returns the area.
• The calcandprintarea resumes executing and calls the printarea function, passing both the radius & the area to it
• The printarea executes and prints.