sicily. 1815 计算两点间的距离

#include <iostream>
#include <cmath>
#include <stdio.h>
using namespace std;

int main()
{
int caseNum;
cin >> caseNum;
while(caseNum--)
{
double x1,y1,x2,y2;
cin >> x1 >> y1 >> x2 >> y2;
double dis = sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));

printf("%.2f\n",dis);
}
return 0;
}