From: "Bill Galbraith" <BILLG AT p3 DOT enzian DOT com>
To: djgpp AT delorie DOT com
Date:          Wed, 6 Mar 1996 11:44:07 EDT
Subject:       problem with output of real number in hexidecimal
Message-Id: <13C99F35171@P3.ENZIAN.COM>


I don't speak C very well, and I use DJGPP with the Fortran-to-C 
converter F2C. I am having trouble converting a program which 
executes under DJGPP v1m4 but encounters a problem under DJGPP v2.0 .

The FORTRAN statement to output a real number in hexidecimal is

      Write (6,1000) Num_Coef
 1000 format (z8.8)

which works under DJGPP v1m4.
   
When this statement is executed in C, an error is generated 

   backspace: end of file
   apparent state: unit 6 (unnamed)
   last format: (z8.8)
   lately writing direct formatted external IO
   Abort!


A brief FORTRAN progran to illustrate this problem is contained in 
the file A.F, such as:

      Program A
      REAL*4    Num_Coef
      DATA Num_Coef / 1.0 /
      Write (6,1000) Num_Coef
 1000 format (z8.8)
      END

The C code that is generated by F2C, in the file A.C, is

/* a.f -- translated by f2c (version 19950920).
   You must link the resulting object file with the libraries:
    -lf2c -lm   (in that order)
*/

#include "f2c.h"

/* Table of constant values */

static integer c__1 = 1;

/* Main program */ MAIN__()
{
    /* Initialized data */

    static real num_coef__ = (float)1.;

    /* Format strings */
    static char fmt_1000[] = "(z8.8)";

    /* Builtin functions */
    integer s_wsfe(), do_fio(), e_wsfe();

    /* Fortran I/O blocks */
    static cilist io___2 = { 0, 6, 0, fmt_1000, 0 };


    s_wsfe(&io___2);
    do_fio(&c__1, (char *)&num_coef__, (ftnlen)sizeof(real));
    e_wsfe();
} /* MAIN__ */

/* Main program alias */ int a_ () { MAIN__ (); }



Yes, I have checked that the same code is generated with the two 
different set-ups for DJGPP I have on my disk, v1m4 and v2, and have 
checked the outputs for both F2C and F2CX.

Can anyone shed some light on my problem? Is this a problem with 
DJGPP v2.0 or with the F2C converter?

Thanks

Bill Galbraith
billg AT p3 DOT enzian DOT com