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Using wiringPi & digitalRead yields varying states with a dangling dupont wire

JohnQPublic
in Beginners

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I have a small C program where a GPIO pin on Orange Pi is polled using digitalRead. It works fine and detects HIGH and LOW as expected. When I put a dupont wire with nothing connected at the other end (ie. just extend the GPIO pin) digitalRead starts registering intermittent HIGHs and LOWs wildly. What the heck am I seeing? I have a Raspberry 3 nearby and it does not show this phenomenom.

Using digitalWrite on the pin works as expected.

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