FPRINTF FPRINTF Formated File Output Function (C-Style)

Usage

Prints values to a file.  The general syntax for its use is

  fprintf(fp,format,a1,a2,...).

or, 

  fprintf(format,a1,a2,...).

Here format is the format string, which is a string that
controls the format of the output.  The values of the variables
ai are substituted into the output as required.  It is
an error if there are not enough variables to satisfy the format
string.  Note that this fprintf command is not vectorized!  Each
variable must be a scalar.  The value fp is the file handle.  If fp is omitted,
file handle 1 is assumed, and the behavior of fprintf is effectively equivalent to printf. For
more details on the format string, see printf.
