题目101-两点距离

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main(){
float x1,y1,x2,y2,s=0;
int n;
cin>>n;
while(n--){
cin>>x1>>y1>>x2>>y2;
s=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
cout<<setiosflags(ios::fixed)<<setprecision(2);
cout<<s<<endl;

}
}