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 vprintf()               Write Formatted Data to Stdout

 #include   <stdio.h>
 #include   <varargs.h>                 Use for UNIX V compatibility
 #include   <stdarg.h>                  Use for ANSI C standard compatibility

 int        vprintf(format-string,arg-ptr);
 const char *format-string;              Format control
 va_list    arg-ptr;                     Pointer to list of arguments

    vprintf() formats and prints a series of characters and values to the
    standard output stream 'stdout'. It is similar to printf(), but
    instead of taking a list of arguments it accepts a pointer to a list
    of arguments.

    'arg-ptr' has the type 'va_list'.  'va_list' is defined in
    <varargs.h> for UNIX V compatibility and in <stdarg.h> for
    compatibility with the proposed ANSI C standard.  'arg-ptr' points to
    a list of arguments.  These arguments are converted and output
    according to specifications in 'format-string'.  (For the inner
    workings of variable-length parameter lists, see va_start(),
    va_arg(), and va_end()).

    See printf() for a complete description of 'format-string'.

   -------------------------------- Example ---------------------------------

    The following statements write data to the console.

           #include <stdio.h>
           #include <stdarg.h>

           int x;
           main()
           {
               char *date = "12/21/86";
               char *header = "ANNUAL REPORT";

                   putdata("Data from : %s, (%s)\n",header,date);
                   for (x = 0; x < 100; x++)
                       putdata("%d",x);
                   putdata("\nEnd of Report\n");
                   fclose(stream);
               }
           }

           putdata(fmt_str)
           char *fmt_str;
           {
                va_list arg_ptr;

                va_start(arg_ptr,fmt_str);
                vprintf(fmt_str,arg_ptr);
                va_end(arg_ptr);
           }