1 /* Test mpz_hamdist. 2 3 Copyright 2001, 2002 Free Software Foundation, Inc. 4 5 This file is part of the GNU MP Library. 6 7 The GNU MP Library is free software; you can redistribute it and/or modify 8 it under the terms of the GNU Lesser General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or (at your 10 option) any later version. 11 12 The GNU MP Library is distributed in the hope that it will be useful, but 13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 15 License for more details. 16 17 You should have received a copy of the GNU Lesser General Public License 18 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 19 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include "gmp.h" 23 #include "gmp-impl.h" 24 #include "tests.h" 25 26 27 void 28 check_twobits (void) 29 { 30 unsigned long i, j, got, want; 31 mpz_t x, y; 32 33 mpz_init (x); 34 mpz_init (y); 35 for (i = 0; i < 5 * GMP_NUMB_BITS; i++) 36 { 37 for (j = 0; j < 5 * GMP_NUMB_BITS; j++) 38 { 39 mpz_set_ui (x, 0L); 40 mpz_setbit (x, i); 41 mpz_set_ui (y, 0L); 42 mpz_setbit (y, j); 43 44 want = 2 * (i != j); 45 got = mpz_hamdist (x, y); 46 if (got != want) 47 { 48 printf ("mpz_hamdist wrong on 2 bits pos/pos\n"); 49 wrong: 50 printf (" i %lu\n", i); 51 printf (" j %lu\n", j); 52 printf (" got %lu\n", got); 53 printf (" want %lu\n", want); 54 mpz_trace (" x ", x); 55 mpz_trace (" y ", y); 56 abort(); 57 } 58 59 mpz_neg (x, x); 60 mpz_neg (y, y); 61 want = ABS ((long) (i-j)); 62 got = mpz_hamdist (x, y); 63 if (got != want) 64 { 65 printf ("mpz_hamdist wrong on 2 bits neg/neg\n"); 66 goto wrong; 67 } 68 } 69 70 } 71 mpz_clear (x); 72 mpz_clear (y); 73 } 74 75 76 void 77 check_rand (void) 78 { 79 gmp_randstate_ptr rands = RANDS; 80 unsigned long got, want; 81 int i; 82 mpz_t x, y; 83 84 mpz_init (x); 85 mpz_init (y); 86 87 for (i = 0; i < 2000; i++) 88 { 89 mpz_erandomb (x, rands, 6 * GMP_NUMB_BITS); 90 mpz_negrandom (x, rands); 91 mpz_mul_2exp (x, x, urandom() % (4 * GMP_NUMB_BITS)); 92 93 mpz_erandomb (y, rands, 6 * GMP_NUMB_BITS); 94 mpz_negrandom (y, rands); 95 mpz_mul_2exp (y, y, urandom() % (4 * GMP_NUMB_BITS)); 96 97 want = refmpz_hamdist (x, y); 98 got = mpz_hamdist (x, y); 99 if (got != want) 100 { 101 printf ("mpz_hamdist wrong on random\n"); 102 printf (" got %lu\n", got); 103 printf (" want %lu\n", want); 104 mpz_trace (" x ", x); 105 mpz_trace (" y ", y); 106 abort(); 107 } 108 } 109 mpz_clear (x); 110 mpz_clear (y); 111 } 112 113 int 114 main (void) 115 { 116 tests_start (); 117 mp_trace_base = -16; 118 119 check_twobits (); 120 check_rand (); 121 122 tests_end (); 123 exit (0); 124 } 125