#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
double d, v, u, t, r, a = 0;
long long int i, n;
cout << showpoint;
cout << fixed;
cout << setprecision(3);
cin >> n;
for(i=1; i<=n; i++)
{
cin >> d >> v >> u;
if(v>=u || u == 0 || v == 0)
{
cout << "Case " << i << ": " << "can't determine" << endl;
}
else
{
t = d/u;
r = d/sqrt((u*u) - (v*v));
a = r-t;
cout << "Case " << i << ": " << a << endl;
}
}
return 0;
}
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
double d, v, u, t, r, a = 0;
long long int i, n;
cout << showpoint;
cout << fixed;
cout << setprecision(3);
cin >> n;
for(i=1; i<=n; i++)
{
cin >> d >> v >> u;
if(v>=u || u == 0 || v == 0)
{
cout << "Case " << i << ": " << "can't determine" << endl;
}
else
{
t = d/u;
r = d/sqrt((u*u) - (v*v));
a = r-t;
cout << "Case " << i << ": " << a << endl;
}
}
return 0;
}
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