fprintf

#include <stdio.h>

int fprintf  (
    FILE* stream,             /* file stream to write to */
    const char* format,       /* format string */
    ...);                     /* additional arguments */

The function fprintf writes a string to a data stream. The parameter stream is a pointer defining the data stream. The parameter format is a pointer defining the format for the output. The rules correspond to the standard printf formatting string. The optional arguments are converted and output according to the corresponding format specifications in format.

The function is included in the library RL-FlashFS. The prototype is defined in the file stdio.h.

• number of bytes written - on success.
• < 0 - on error.

fscanf

#include <rtl.h>
#include <stdio.h>

void tst_fprintf (void)  {
  FILE *fout;
  int i = 56;

  fout = fopen ("Test.txt","w");
  if (fout == NULL)  {
    printf ("File open error!\n");
  }
  else  {
    fprintf (fout, "printf test: val = %i fval =%f\n", i, i * 3.45);
    fclose (fout);
  }
}