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Going forward, but gently...

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This commit is contained in:
Yorick Barbanneau 2023-05-05 01:48:36 +02:00
parent 4a30965654
commit 97a81f159a
4 changed files with 36 additions and 8 deletions
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12
content/conception_formelle/99-DM_framac/code/max_dist.c
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@ -5,6 +5,16 @@ int max_dist(int *tab, unsigned int n)
int min = tab[0];
int max = tab[0];
unsigned int i = 1;
/*@
loop assigns i, max, min;
loop invariant I1: \at(i, LoopEntry) <= i <= n;
loop invariant I2: min <= max;
loop invariant I3: \forall integer j; (\at(i, LoopEntry) <= j < i ==> max >= tab[j] >= min);
loop invariant I4: \exists integer j; ( 0 < j < i ==> max == tab[j]);
loop invariant I5: \exists integer j; ( 0 < j < i ==> min == tab[j]);
loop variant n - i;
*/
while (i < n)
{
if (tab[i] < min)
@ -14,4 +24,4 @@ int max_dist(int *tab, unsigned int n)
i++;
}
return max - min;
}
}