I think this is *x system.
The "Ctrl+Z" is mapped to the suspend signal (SIGTSTP).
This suspends the execution of the program. You can restart the execution of the program by :
fg %1 (if this is the first task to be suspended).
Actually, "Ctrl+Z" does not bring you out of the while loop. On starting it again, you will still be inside the while loop.
You will have to press "Ctrl+D" to come out of the loop.
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in thread Basic Input and Output