1 /* tsgn -- Test for the sign of a floating point number. 2 3 Copyright 2003, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 4 Contributed by the Arenaire and Cacao projects, INRIA. 5 6 This file is part of the GNU MPFR Library. 7 8 The GNU MPFR Library is free software; you can redistribute it and/or modify 9 it under the terms of the GNU Lesser General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or (at your 11 option) any later version. 12 13 The GNU MPFR Library is distributed in the hope that it will be useful, but 14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16 License for more details. 17 18 You should have received a copy of the GNU Lesser General Public License 19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23 #include <stdio.h> 24 #include <stdlib.h> 25 26 #include "mpfr-test.h" 27 28 static void 29 check_special (void) 30 { 31 mpfr_t x; 32 int ret = 0; 33 34 mpfr_init (x); 35 MPFR_SET_ZERO (x); 36 if ((mpfr_sgn) (x) != 0 || mpfr_sgn (x) != 0) 37 { 38 printf("Sgn error for 0.\n"); 39 ret = 1; 40 } 41 MPFR_SET_INF (x); 42 MPFR_SET_POS (x); 43 if ((mpfr_sgn) (x) != 1 || mpfr_sgn (x) != 1) 44 { 45 printf("Sgn error for +Inf.\n"); 46 ret = 1; 47 } 48 MPFR_SET_INF (x); 49 MPFR_SET_NEG (x); 50 if ((mpfr_sgn) (x) != -1 || mpfr_sgn (x) != -1) 51 { 52 printf("Sgn error for -Inf.\n"); 53 ret = 1; 54 } 55 MPFR_SET_NAN (x); 56 mpfr_clear_flags (); 57 if ((mpfr_sgn) (x) != 0 || !mpfr_erangeflag_p ()) 58 { 59 printf("Sgn error for NaN.\n"); 60 ret = 1; 61 } 62 mpfr_clear_flags (); 63 if (mpfr_sgn (x) != 0 || !mpfr_erangeflag_p ()) 64 { 65 printf("Sgn error for NaN.\n"); 66 ret = 1; 67 } 68 mpfr_clear (x); 69 if (ret) 70 exit (ret); 71 } 72 73 static void 74 check_sgn(void) 75 { 76 mpfr_t x; 77 int i, s1, s2; 78 79 mpfr_init(x); 80 for(i = 0 ; i < 100 ; i++) 81 { 82 mpfr_urandomb (x, RANDS); 83 if (i&1) 84 { 85 MPFR_SET_POS(x); 86 s2 = 1; 87 } 88 else 89 { 90 MPFR_SET_NEG(x); 91 s2 = -1; 92 } 93 s1 = mpfr_sgn(x); 94 if (s1 < -1 || s1 > 1) 95 { 96 printf("Error for sgn: out of range.\n"); 97 goto lexit; 98 } 99 else if (MPFR_IS_NAN(x) || MPFR_IS_ZERO(x)) 100 { 101 if (s1 != 0) 102 { 103 printf("Error for sgn: Nan or Zero should return 0.\n"); 104 goto lexit; 105 } 106 } 107 else if (s1 != s2) 108 { 109 printf("Error for sgn. Return %d instead of %d.\n", s1, s2); 110 goto lexit; 111 } 112 } 113 mpfr_clear(x); 114 return; 115 116 lexit: 117 mpfr_clear(x); 118 exit(1); 119 } 120 121 int 122 main (int argc, char *argv[]) 123 { 124 tests_start_mpfr (); 125 126 check_special (); 127 check_sgn (); 128 129 tests_end_mpfr (); 130 return 0; 131 } 132