// Author : hejinming2012
#include <bits/stdc++.h>
#define int long long
#define endl '\n'
#define dbg(x) cout << #x " = " << (x) << endl
#define quickio ios::sync_with_stdio(false);
#define quickin cin.tie(0);
#define quickout cout.tie(0);

using namespace std;
inline int read() {
	int now = 0, nev = 1; char c = getchar();
	while(c < '0' || c > '9') { if(c == '-') nev = -1; c = getchar(); }
	while(c >= '0' && c <= '9') { now = (now << 1) + (now << 3) + (c & 15); c = getchar(); }
	return now * nev;
}
void write(int x) {
	if(x < 0) putchar('-'), x = -x;
	if(x > 9) write(x / 10);
	putchar(x % 10 + '0');
}

signed main() {
	quickio
	quickin
    quickout
    int T = read();
	for(int _ = 1; _ <= T; _++) {
		int n = read(), m = read();
		double y;
		if(n == 1) y = 1.0;
		else y = 0.5;
		double z;
		if(m == 0) z = 0.0;
		else z = (double) (m + 1) / (2.0 * m);
		printf("Case #%lld: %.6lf %.6lf\n", _, y, z);
	}
	return 0;
}