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# [Frama-c-discuss] Specification Examples

• Subject: [Frama-c-discuss] Specification Examples
• From: Christoph.Weber at first.fraunhofer.de (Christoph Weber)
• Date: Thu Oct 9 15:44:10 2008

```Hello,

I'm exercising with the jessie-tool learn the usage of the ACSL-Language.
I have two examples. My Problem is with the second one.

#1: works fine, i get green bullets
/*@
requires 0 < n;
requires \valid_range(a, 0, n-1);
ensures  \forall int i; 0 <= i < n ==> a[i] == 0;
*/
void array_zero(int* a, int n){
/*@ loop invariant 0 <= i <= n && \forall int k; 0 <= k < i ==> a[k] == 0;
*/
for(int i = 0;i< n;i++){
a[i]=0;
}
}

#2: in the second example the preservation of the loop invariant wont work

/*@
requires 0 < n;
requires \valid_range(a, 0, n-1) && \valid_range(b, 0, n-1);
ensures  \forall int k; 0 <= k < n ==> a[k] == b[k];
*/
void array_cpy(int* a, int n, int* b){
/*@ loop invariant 0 <= i <= n && \forall int m; 0 <= m < i  ==> a[m] == b[m];
*/
for(int i = 0;i< n;i++){
a[i]=b[i];
}
}

What am I missing, to get the examples running?

Christoph

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```