Code Review Needed

Could You Please go through my code I have applied modified binary search but giving the wrong answer.
#include <bits/stdc++.h>
using namespace std;
int binary_method(unsigned long long int start,unsigned long long int end,unsigned long long int k,unsigned long long int n,unsigned long long int mid)
{

if(start>end)
{
    return mid;
}

mid=(start+end)/2;

if(pow(mid,k)<=n)
{
    //cout<<"upper:"<<mid<<" "<<k<<endl;
     return binary_method(mid+1,end,k,n,mid);
}

else if(pow(mid,k)>n)
{
    //cout<<"lower:"<<" "<<mid<<" "<<k<<endl;
    return binary_method(start,mid-1,k,n,mid);
}

}
int main()
{
int test;
cin>>test;
while(test–)
{
unsigned long long int n;
unsigned long long int k;

    cin>>n>>k;
    //n=sqrt(n);
    unsigned long long int prev_mid=0;
    unsigned long long int x=binary_method(0,n,k,n,prev_mid);
    cout<<x<<endl;
}

return 0;
}

I have edited your code, try to submit now,