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//Translation from filter2.c
//Should give an error
//Same as the previous one; it works with reals!
procedure main() returns () {
var E : real;
var E0 : real;
var E1 : real;
var S : real;
var S0 : real;
var S1 : real;
var i: int;
havoc E;
havoc E0;
assume(E >= 0.0 && E <= 1.0);
assume(E0 >= 0.0 && E0 <= 1.0);
S0 := 0.0;
S := 0.0;
i := 0;
while (i <= 1000000)
{
E1 := E0;
E0 := E;
havoc E;
assume(E >= 0.0 && E <= 1.0);
S1 := S0;
S0 := S;
S := E*0.7 - E0*1.3 + E1*1.1 + S0*1.4 - S1*0.7;
assert(S >= -4.0 && S <= 4.0);
i := i + 1;
}
}
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