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Referring to a global variable over local one in Arduino Nano

In C code on Arduino Nano, how can I refer to a global variable with the same name as local one?
Example:

Referring to a global variable over local one in Arduino Nano

In C code on Arduino Nano, how can I refer to a global variable with the same name as local one?
Example:

Referring to a global variable over local one in Arduino Nano

In C code on Arduino Nano, how can I refer to a global variable with the same name as local one?
Example: