两点距离

#include <iostream>#include <cmath>using namespace std;int main(){int n;cin>>n;while(n--){double x0, y0, x1, y1;cin>>x0>>y0>>x1>>y1;cout.precision(2);cout<<fixed<<sqrt(pow(abs(x1-x0),2)+pow(abs(y1-y0),2))<<endl;}return 0;}