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並前往https://forum.arduino.cc/t/char-c-str-i-c_str-returns-an-error-why/618193

char c = str[i].c_str(); returns an error. Why - Arduino Forum

returns src/main.cpp:827:32: error: request for member 'c_str' in 'str.String::operator[](((unsigned int)i))', which is of non-class type ...

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