1 /* Test of splitting a 'long double' into fraction and mantissa.
2 Copyright (C) 2007 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
22 #include "printf-frexpl.h"
27 #define ASSERT(expr) if (!(expr)) abort ();
30 my_ldexp (long double x, int d)
45 for (i = 1, x = 1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
48 long double mantissa = printf_frexpl (x, &exp);
49 ASSERT (exp == i - 1);
50 ASSERT (mantissa == 1.0L);
52 for (i = 1, x = 1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
55 long double mantissa = printf_frexpl (x, &exp);
56 ASSERT (exp == i - 1);
57 ASSERT (mantissa == 1.0L);
59 for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
62 long double mantissa = printf_frexpl (x, &exp);
63 ASSERT (exp == LDBL_MIN_EXP - 1);
64 ASSERT (mantissa == my_ldexp (1.0L, i - LDBL_MIN_EXP));
67 for (i = 1, x = 1.01L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
70 long double mantissa = printf_frexpl (x, &exp);
71 ASSERT (exp == i - 1);
72 ASSERT (mantissa == 1.01L);
74 for (i = 1, x = 1.01L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
77 long double mantissa = printf_frexpl (x, &exp);
78 ASSERT (exp == i - 1);
79 ASSERT (mantissa == 1.01L);
81 for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
84 long double mantissa = printf_frexpl (x, &exp);
85 ASSERT (exp == LDBL_MIN_EXP - 1);
86 ASSERT (mantissa >= my_ldexp (1.0L, i - LDBL_MIN_EXP));
87 ASSERT (mantissa <= my_ldexp (2.0L, i - LDBL_MIN_EXP));
88 ASSERT (mantissa == my_ldexp (x, - exp));
91 for (i = 1, x = 1.73205L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
94 long double mantissa = printf_frexpl (x, &exp);
95 ASSERT (exp == i - 1);
96 ASSERT (mantissa == 1.73205L);
98 for (i = 1, x = 1.73205L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
101 long double mantissa = printf_frexpl (x, &exp);
102 ASSERT (exp == i - 1);
103 ASSERT (mantissa == 1.73205L);
105 for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
108 long double mantissa = printf_frexpl (x, &exp);
109 ASSERT (exp == LDBL_MIN_EXP - 1);
110 ASSERT (mantissa >= my_ldexp (1.0L, i - LDBL_MIN_EXP));
111 ASSERT (mantissa <= my_ldexp (2.0L, i - LDBL_MIN_EXP));
112 ASSERT (mantissa == my_ldexp (x, - exp));