include [HTML_REMOVED]

int main()
{
double x = 0;
scanf(“%lf”, &x);
double r, l;
if (x >= 0)
{
l = 0;
r = x + 1;
while (r - l > 1e-9)
{
double mid = (l + r) / 2.0;
if (mid * mid * mid >= x)
r = mid;
else
l = mid;
}

}
else
{
    r = 0;
    l = x - 1;
    while (r-l > 1e-9)
    {
        double mid = (l + r) / 2.0;
        if (mid * mid * mid < x)
            l = mid;
        else
            r = mid;
    }
}
printf("%lf", l);
return 0;

}

//C语言，带有负数的判定