Serial debug from c file

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hello.
i excuse in prior pretty noop question.
i have tried find answer question on google , on page can apparently not type in right "question".
here question:
i have project containing .c file (due shield use). t o able print serial port c code can not use serial.println() etc. c file. should include inorder so?

thanks in advance:)

quote
however can not use serial.println() etc. c file.

why not?

quote
what should include inorder so?

have included wprogram.h in c file?



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