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Doubt regarding on sdcard

Hai 

            currently i am working on SD card.The main concept of my project i have store the voltage,current,freqency and time.i.e

like this                          voltage  current  freqency

                                      Mar  10:20:11  2015

How to print the new line in a file.i have akready tested with fprinf(&file,"\n"); but i  didn't get a new line in this please suggest me how can i do this i got errors like this when i did with f printf();

The errors are:

Description Resource Path Location Type
#10010 errors encountered during linking; "sd_card.out" not built sd_card C/C++ Problem

unresolved symbol f_printf, first referenced in ./sd_card.obj sd_card C/C++ Problem

so please help me on this issue.............thank u