#include"iostream"
using namespace std;
double sqrt(double a){
double x=a;
double l=a;double r=a;
//确定区间
while(l*l>a){
l/=2;
if(l*l>a){
l/=2;
r/=2;
}else{
break;
}
}
// 二分法
while (l<=r-0.000001)
{
x=l+(r-l)/2;
if(x*x<a){
l=x;
}else{
r=x;
}
}
return x;
}
int main(){
cout<<sqrt(0)<<endl;
cout<<sqrt(1)<<endl;
cout<<sqrt(2)<<endl;
cout<<sqrt(3)<<endl;
cout<<sqrt(4)<<endl;
cout<<sqrt(5)<<endl;
cout<<sqrt(6)<<endl;
cout<<sqrt(60)<<endl;
cout<<sqrt(60342342)<<endl;
return 0;
}