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what What is a flag in programming arduinoArduino?

I have seen many tutorials on programming a arduinoan Arduino to control a hcHC-05 bluetooth module. In that I did not understand the term called 'flag'. What does that mean?

what is flag in programming arduino?

I have seen many tutorials on programming a arduino to control a hc-05 bluetooth module. In that I did not understand the term called 'flag'. What does that mean?

What is a flag in programming Arduino?

I have seen many tutorials on programming an Arduino to control a HC-05 bluetooth module. In that I did not understand the term called 'flag'. What does that mean?

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what is flag in programming arduino?

I have seen many tutorials on programming a arduino to control a hc-05 bluetooth module. In that I did not understand the term called 'flag'. What does that mean?