itsa基 3 判斷座標是否在圓形的範圍內

#include <iostream>
#include <cmath>
using namespace std;

double Count(double X);

int main ()
{
int X,Y,x,r;
cin >> X >> Y;
x = X * X + Y * Y;
r = Count(x);
if (r <= 100)
{
cout << "inside" << endl;
}
else
{
cout << "outside" << endl;
}
return 0;
}

double Count(double x)
{
return pow(x,1.0 / 2);
}