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From: hbo@sbphy.physics.ucsb.edu (Howard B Owen)
Newsgroups: comp.unix.ultrix
Subject: Ultrix 4.0/cc 2.1 bug
Keywords: cc bug printf double i/o
Message-ID: <9428@hub.ucsb.edu>
Date: 26 Feb 91 00:29:38 GMT
References: <2238.27c3b13c@idx.com> <1991Feb25.171412.2506@aio.jsc.nasa.gov>
Sender: news@hub.ucsb.edu
Reply-To: hbo@sbphy.physics.ucsb.edu (Howard B Owen)
Organization: UCSB Physics Department
Lines: 65


 
I have a problem that I seem to recall was discussed in this group.:

Environment: Mips cc v 2.1/Ultrix v4.0/DECstation 5000
Problem: Output of doubles is garbled when mixed with other i/o statements.
Example:
#include <stdio.h>
main()
{
FILE     *outfile = fopen( "quantum.dat", "w" );
  double   energy = 0.01;
  printf("%f\n", energy);
  printf("%f\n", energy);
  fclose (outfile); 
}

  This program, compiled with "cc bug.c -o bug", produces the following output:

0.010000
19991592789737117000000000000000000000.000000

  If the fopen and fclose statements are removed, or if a value is
assigned to "energy" after the first printf, Then the output is as
expected. Also, the following program displays a similar problem:

#include <stdlib.h>
#include <stdio.h>

main() {
  float a= -0.1;
  double mu = -0.1;

  printf("%15.3e\n",mu);
  printf("%15.3e\n",a);
  printf("%15.3e\n",mu);
}  

The output from this program, compiled like the last one, is:
 
    -1.000e-01
    -1.000e-01
    -2.353e-185

   I can't believe such a severe bug could be part of a correctly
configured system. We have 
FORTRAN v 2.1 installed, as the following excerpt from setld -i shows:

F77BACKEND021   installed       V2.1 Compiler Back End
F77BASE021          installed       F77 Programming Environment
F77MAN021          installed       F77 Manual Pages
F77UNSUP021       installed       F77 Unsupported Utilities


   Any help you could offer would be appreciated.

  Thanks,
--
Howard Owen, Computer Systems Manager    internet: hbo@sbphy.physics.ucsb.edu
Physics Computer Services                              BITNET:          
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