Writing a float value to a file

i trying write float value file on sd card.  don't understand why serial.println(float) on works, file.println(float) not.

if can explain i'd grateful.  i've tried looking @ dtostrf, cannot find in reference.

thanks.

i don't have sd shield. can define "doesn't work"? mean "doesn't compile", or "compiles, doesn't write file"?

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