NYOJ:两点距离
#include<stdio.h>
#include<math.h>
int main()
{
int n;
scanf("%d",&n);
while(n--)
{
float x1,y1,x2,y2,d;
scanf("%f%f%f%f",&x1,&y1,&x2,&y2);
d=(x2-x1)*(x2-x1)+(y2-y1)*(y2-y1);
printf("%.2f\n",sqrt(d));
}
return 0;
}