数的三次方根

求浮点数 n的三次方根

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#include <iostream> using namespace std; double n;   double BF (double x) {     double l = -100, r = 100;     while (r - l > 1e-8) {         double mid = (l + r) / 2;         if (mid * mid * mid < x) l = mid;         else r = mid;     }           return l; }   int main() {     double x;     cin >> x;     printf("%.6lf\n", BF(x));     return 0; }