I m learning binary search and here i need to find the nth root of a number ,i am not able to figure out the error in the below program please help

#include <iostream>
#include <vector>
#include<algorithm>
#include<iomanip>
using namespace std;

double solve(double x, int n){
    int iter=200;
    double low=0;
    double high=x;
    while(iter--){
        double mid = (low+high)/2;
        //cout<<mid<<endl;
        double val = pow(mid,n);
        cout<<val<<endl;
        if(val<x)low=mid;
        else high=mid;
    }
    return low;
}

int main() {
    // int t--;
  int t;
  cin>>t;
  while(t--){
    double x;
    cin>>x;
    int n;
    cin>>n;

    cout<<fixed<<setprecision(12)<<solve(x,n)<<endl;
  }
  return 0;
}