1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/**************************************************************************/
/* */
/* The Why platform for program certification */
/* */
/* Copyright (C) 2002-2011 */
/* */
/* Jean-Christophe FILLIATRE, CNRS & Univ. Paris-sud 11 */
/* Claude MARCHE, INRIA & Univ. Paris-sud 11 */
/* Yannick MOY, Univ. Paris-sud 11 */
/* Romain BARDOU, Univ. Paris-sud 11 */
/* */
/* Secondary contributors: */
/* */
/* Thierry HUBERT, Univ. Paris-sud 11 (former Caduceus front-end) */
/* Nicolas ROUSSET, Univ. Paris-sud 11 (on Jessie & Krakatoa) */
/* Ali AYAD, CNRS & CEA Saclay (floating-point support) */
/* Sylvie BOLDO, INRIA (floating-point support) */
/* Jean-Francois COUCHOT, INRIA (sort encodings, hyps pruning) */
/* Mehdi DOGGUY, Univ. Paris-sud 11 (Why GUI) */
/* */
/* This software is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU Lesser General Public */
/* License version 2.1, with the special exception on linking */
/* described in file LICENSE. */
/* */
/* This software is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. */
/* */
/**************************************************************************/
//@+ CheckArithOverflow = no
public class negate {
/*@ requires t != null;
@ assigns t[0..t.length-1];
@ ensures \forall integer k; 0 <= k < t.length ==> t[k] == -\old(t[k]);
@*/
static void negate(int t[]) {
int i = 0;
/*@ loop_invariant
@ 0 <= i <= t.length &&
@ (\forall integer k; 0 <= k < i ==> t[k] == -\at(t[k],Pre)) &&
@ (\forall integer k; i <= k < t.length ==> t[k] == \at(t[k],Pre)) ;
@ // TODO: replace previous invariant by loop_assigns t[0..i-1];
@ loop_variant t.length-i;
@*/
while (i < t.length) {
t[i] = -t[i];
i++;
}
}
}
/*
Local Variables:
compile-command: "make Negate.why3ml"
End:
*/
|
