1 /* ieee-utils/print.c
2 *
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 */
19
20 #include "gsl__config.h"
21 #include <stdio.h>
22 #include <math.h>
23 #include "gsl_ieee_utils.h"
24
25 /* A table of sign characters, 0=positive, 1=negative. We print a space
26 instead of a unary + sign for compatibility with bc */
27
28 static char signs[2]={' ','-'} ;
29
30 void
gsl_ieee_fprintf_float(FILE * stream,const float * x)31 gsl_ieee_fprintf_float (FILE * stream, const float * x) {
32 gsl_ieee_float_rep r ;
33 gsl_ieee_float_to_rep(x, &r) ;
34
35 switch (r.type)
36 {
37 case GSL_IEEE_TYPE_NAN:
38 fprintf(stream, "NaN") ;
39 break ;
40 case GSL_IEEE_TYPE_INF:
41 fprintf(stream, "%cInf", signs[r.sign]) ;
42 break ;
43 case GSL_IEEE_TYPE_NORMAL:
44 fprintf(stream, "%c1.%s*2^%d", signs[r.sign], r.mantissa, r.exponent) ;
45 break ;
46 case GSL_IEEE_TYPE_DENORMAL:
47 fprintf(stream, "%c0.%s*2^%d", signs[r.sign], r.mantissa, r.exponent + 1) ;
48 break ;
49 case GSL_IEEE_TYPE_ZERO:
50 fprintf(stream, "%c0", signs[r.sign]) ;
51 break ;
52 default:
53 fprintf(stream, "[non-standard IEEE float]") ;
54 }
55 }
56
57 void
gsl_ieee_printf_float(const float * x)58 gsl_ieee_printf_float (const float * x)
59 {
60 gsl_ieee_fprintf_float (stdout,x);
61 }
62
63 void
gsl_ieee_fprintf_double(FILE * stream,const double * x)64 gsl_ieee_fprintf_double (FILE * stream, const double * x) {
65 gsl_ieee_double_rep r ;
66 gsl_ieee_double_to_rep (x, &r) ;
67
68 switch (r.type)
69 {
70 case GSL_IEEE_TYPE_NAN:
71 fprintf(stream, "NaN") ;
72 break ;
73 case GSL_IEEE_TYPE_INF:
74 fprintf(stream, "%cInf", signs[r.sign]) ;
75 break ;
76 case GSL_IEEE_TYPE_NORMAL:
77 fprintf(stream, "%c1.%s*2^%d", signs[r.sign], r.mantissa, r.exponent) ;
78 break ;
79 case GSL_IEEE_TYPE_DENORMAL:
80 fprintf(stream, "%c0.%s*2^%d", signs[r.sign], r.mantissa, r.exponent + 1) ;
81 break ;
82 case GSL_IEEE_TYPE_ZERO:
83 fprintf(stream, "%c0", signs[r.sign]) ;
84 break ;
85 default:
86 fprintf(stream, "[non-standard IEEE double]") ;
87 }
88 }
89
90 void
gsl_ieee_printf_double(const double * x)91 gsl_ieee_printf_double (const double * x)
92 {
93 gsl_ieee_fprintf_double (stdout,x);
94 }
95
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