Perl - weird loop behavior with ReadKey?

It's because ReadKey reads a key . When you press x 3 times and then Enter that's 4 keys. In fact, even a correct selection ( 1 Enter ) is 2 keys; you just don't notice because your program exits immediately.

Looks like your program reads a key, goes into the else loop and sleeps while you type your other characters, then continues. You may be suffering from buffering in that the print does not happen immediately when using sleep.

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