算法学习——浮点数二分

#include<bits/stdc++.h>
using namespace std;

int main(){
    double l = -10000,r = 100000;
    double x;
    cin>>x;
    while( r - l > 1e-8 ){
        double mid = (l + r) /2;
        if(mid * mid * mid >= x){
            r = mid;
        }else{
            l = mid;
        }
    }
    cout<<fixed<<setprecision(6)<<l<<endl;
    
    return 0;
}