import std.conv, std.functional, std.range, std.stdio, std.string; import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons; import core.bitop; class EOFException : Throwable { this() { super("EOF"); } } string[] tokens; string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; } int readInt() { return readToken.to!int; } long readLong() { return readToken.to!long; } real readReal() { return readToken.to!real; } bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } } bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } } int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; } int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); } int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); } enum N = 24; enum EPS = 1e-5L; enum L = 12.22e+74L; debug { real X; } bool Ask(real y) { assert(0 <= y); assert(y <= L); writefln("? %.6f", y); stdout.flush; debug { writeln((X <= y) ? "Yes" : "No"); return (X <= y); } const res = readToken(); if (res == "-1") { import core.stdc.stdlib; exit(1); } return (res == "Yes"); } void Answer(real x) { writefln("! %.6f", x); stdout.flush; assert(0 <= x); assert(x <= L); debug { assert((X - EPS <= x && x <= X + EPS) || (x > 0.0L && 1.0L - EPS <= x / X && x / X <= 1.0L + EPS)); } } real get(real t) { return (t < 0.0L) ? (1.0L + EPS * t) : pow(1.0L + EPS, t); } void main() { const numCases = readInt; foreach (caseId; 0 .. numCases) { debug { X = readReal; } real lo = -1.0L / EPS, hi = log(L) / log1p(EPS); // writefln("lo = %.12f, hi = %.12f, get(lo) = %e, get(hi) = %e",lo,hi,get(lo),get(hi)); foreach (iter; 0 .. N) { const mid = (lo + hi) / 2.0L; const y = get(mid); (Ask(y) ? hi : lo) = mid; } const x = get((lo + hi) / 2.0L); Answer(x); // writefln("lo = %.12f, hi = %.12f, get(lo) = %e, get(hi) = %e",lo,hi,get(lo),get(hi)); } }