Variable Scope and fixing error: '_______' was not declared in this scope?

positive was not declared in this scope error quick solution || i2c 16x2 lcd displayПодробнее

positive was not declared in this scope error quick solution || i2c 16x2 lcd display

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C++ : 'cout' was not declared in this scope

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C++ : error: uint64_t was not declared in this scope when compiling C++ program

Arduino Error : Was Not Declared in This ScopeПодробнее

Arduino Error : Was Not Declared in This Scope

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'D8' was not declared in this scope; did you mean 's8'?Подробнее

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FAQ: Not Declared in this ScopeПодробнее

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NameError: name 'function_name' is not defined.