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並前往https://www.reddit.com/r/arduino/comments/2fum7c/sprintf_outputs_a_question_mark_when_i_try_to/

sprintf() outputs a question mark (?) when I try to format a float ...

the float/double datatype handing on avr mcu's is a bit unusual, and sprintf suffers for it. instead use dtostrf(). see: http://blog.protoneer.co.nz/arduino- ...

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