diff options
Diffstat (limited to 'Test/dafny0/TerminationDemos.dfy')
-rw-r--r-- | Test/dafny0/TerminationDemos.dfy | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/Test/dafny0/TerminationDemos.dfy b/Test/dafny0/TerminationDemos.dfy deleted file mode 100644 index 6b63bfec..00000000 --- a/Test/dafny0/TerminationDemos.dfy +++ /dev/null @@ -1,80 +0,0 @@ -class Example {
- method M(n: int)
- {
- var i := 0;
- while (i < n)
- decreases n - i;
- {
- i := i + 1;
- }
- }
-}
-
-// -----------------------------------
-
-class Fibonacci {
- function Fib(n: int): int
- decreases n;
- {
- if n < 2 then n else Fib(n-2) + Fib(n-1)
- }
-}
-
-// -----------------------------------
-
-class Ackermann {
- function F(m: int, n: int): int
- decreases m, n;
- {
- if m <= 0 then
- n + 1
- else if n <= 0 then
- F(m - 1, 1)
- else
- F(m - 1, F(m, n - 1))
- }
-}
-
-// -----------------------------------
-
-class List {
- var data: int;
- var next: List;
- ghost var ListNodes: set<List>;
- function IsAcyclic(): bool
- reads *;
- decreases ListNodes;
- {
- this in ListNodes &&
- (next != null ==>
- next.ListNodes <= ListNodes && this !in next.ListNodes &&
- next.IsAcyclic())
- }
-
- method Singleton(x: int) returns (list: List)
- ensures list != null && list.IsAcyclic();
- {
- list := new List;
- list.data := x;
- list.next := null;
- list.ListNodes := {list};
- }
-
- method Prepend(x: int, tail: List) returns (list: List)
- requires tail == null || tail.IsAcyclic();
- ensures list != null && list.IsAcyclic();
- {
- list := new List;
- list.data := x;
- list.next := tail;
- list.ListNodes := if tail == null then {list} else {list} + tail.ListNodes;
- }
-
- function Sum(): int
- requires IsAcyclic();
- reads *;
- decreases ListNodes;
- {
- if next == null then data else data + next.Sum()
- }
-}
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